Power driver LED faucet? Answered

Dear All Please could  you help me to know : how the  led faucet can generation power it self for driver led (please see photo) .I bought this device for open see inside (on Ebay) but still not yet arrived. Many thank you

Question by lam 4 years ago  |  last reply 4 years ago


how do i replace a faucet?

I have a leaking faucet and would like to replace it.

Question by 10 years ago  |  last reply 10 years ago




Color changing LED faucet?

I'm looking to make one of those faucets that changes color with the temperature of the water coming out of it. I already have a preliminary circuit using a thermistor, an LM311 comparator and a couple LED's. Just wondering if anyone had any tips of how to refine or whatever. Also hitting a roadblock on how to power this, as I want to make it entirely analog (no microcontrollers, just op amps and the like) and I want it to be fitted to an actual faucet nozzle. If it is fitted to a nozzle, space is very limited and batteries are really not desired. I was thinking along the lines of a mini waterwheel or something that uses kinetic energy from the water.

Question by jarredpickles87 7 years ago  |  last reply 7 years ago


I am seeking a small electric water faucet Answered

Hello All,, I am seeking a small electric water faucet.. it must be very fast in opening and close the water. i want to build my own water fountain.. where can i buy something like that ? Thanks all

Question by EZELab 8 years ago  |  last reply 8 years ago



stuck faucet handle help? Answered

It's a two handle kitchen faucet.  The last time I changed the washer on the HOT handle, I replaced both HOT and COLD plastic handles with metal ones.  I've removed the screw on top.  But can't budge the handle itself off the top of the valve unit.  Without the top screw, it should just slide up off the grooves on the valve unit.  I've tried prying.  I've tried rocking and tapping.  I've tried pouring hot water over the handle. Right now vinegar is sitting in the screw hole.  Usually this takes just a few minutes for the whole job. Any suggestions?.

Question by mole1 3 years ago  |  last reply 3 years ago


How do I replace kitchen faucet washers?

Question by grzsmith 3 years ago  |  last reply 3 years ago


My faucet is beyond leaky... help?

The picture is of my kitchen faucet when it is turned off. This is a brand new faucet. It was replaced a month ago after the old one (which I'm pretty sure was there for quite a few years - definitely longer than the two years we've been here) started doing the same thing. I know nothing about faucets (other than how to take them out of the box and follow the instruction manual to install them), but I'm really hoping I don't have to buy another one, and I would really like some idea as to what is causing this because it seems to be a recurring issue. Can anyone help me with this?

Topic by OceanLady 4 years ago  |  last reply 4 years ago


footpedal faucet control - Pedalworks vs Chicago vs Fisher vs Tapmaster vs others? Which are good, which are trouble?

I am about to put in a new kitchen sink and faucet. I would like a foot pedal. What do you receommend?

Question by 10 years ago  |  last reply 8 years ago


How to remove and install a bathtub faucet?

I need instructions on how to remove an old bathtub faucet that no longer diverts water to the shower properly. I also need instructions on installing a new bath faucet.

Question by anitachill 9 years ago  |  last reply 9 years ago


My shower pipes "scream" when the faucet is on.

My shower pipes "scream" when the faucet is on. Is there a way to fix this without tearing apart the wall and calling a plumber?

Question by clarissa_ann 10 years ago  |  last reply 10 years ago


Excessive Conservation Wearing Out [noun]...

So... While brushing my teeth - I first rinse my brush, turn the faucet on, brush, then rinse the sink/mouth. Yes, I turn the faucet off while brushing. And if you're counting - that's two on/off cycles per brushing...I've been playing with this tool: http://www1.eere.energy.gov/femp/procurement/eep_faucets_showerheads_calc.htmlAnd I pose an open question for discussion.. But first, my data/research...I'm estimating 3 minutes of use per day - 365 days/year. According to the tool... I use 2190 gallons per year. Lets say that's 5 uses per day (2 for teeth - 1 for bathroom use). The tool seems to estimate an 8.4 year service life - so that's a total of 18396 gallons of water over it's life as a faucet.So If I leave the water on while brushing - that's 3 on/off cycles per day.butIf I turn the water off while brushing - That's 5 on/off cycles per day (40% more cycles).Realistically, a faucet's wear comes from on/off cycles - each use bringing it closer to retirement. So 40% of 8.4 years is 3.4 years.Now... Leaving the faucet on an extra 4 minutes per day (2 minutes per brushing) consumes 2920 gallons of water per year.The difference over 8.4 years is: 30660-18396=12264 gallons. At about $4 per 1000 gallons - that difference is $49.06. BUT, the direct replacement for my faucet (as priced today in home depot to the exact model) is $75. So after 8.4 yearsFaucet remaining on will cost me:$49.06 + $75 = $124.06Faucet being turned off will cost me:$75 + $30(prorated cost of faucet for 3.4 years of wear on a new faucet) = $105Differences:$19.0612,264 gallons of waterThat is to say - due to extra wear on my faucet - it's only marginally more economical to turn my faucet off while brushing my teeth. If I wasn't me, and not able to DIY replace - it very well may be cost effective to leave it on given the cost of a hiring a handy man or plumber...Okay... Now that you've read the above... please discuss your thoughts. I am very much aware of the assumptions I have made (no need to point them out) - just looking for opinions :)UpdateLets turn this discussion on it's head now... As several have pointed out, conserving is more important - bonus as it's close to an economical wash in my fictitious scenario above (it's not 100% real and based on data from the link above and some hefty assumptions).My car uses .3 gallons of gasoline per hour at idle. Lets take a 100% city drive in heavy traffic (my drive yesterday). I was at a complete stop due to traffic lights or traffic for 20 seconds or more a total of 12 times to travel ~10 miles (yes, I freakin timed it). So that's a total of 4 minutes (wow, that worked out nice) of idle time. That time consumes 0.02 gallons of fuel costing me $0.06. If I were to make that commute 5 days a week, twice daily - that's a cost of:10.4 gallons of gasoline$31.2 worth of fuelSo, a new starter for my car costs $130. Typically the motors don't actually die - just the contacts. But lets assume I don't want to fiddle with that and just want to direct replace (corollary to valve washers :D).This means - using my starter an additional 24 times per day - it will take 4.2 years for the fuel savings to pay for a new starter. In 4.2 years - averaging 12,000 miles per year - I will have traveled 50400 miles.Okay - now lets consider the cost of fuel to restart - 24 times.... According to mechanical engineering magazine, a V6 engine used 5 seconds worth of idling gasoline to restart. So - redoing some math to compensate - that's a savings of7.8 gallons of gasoline per year$23.4 per yearTime to recoup 1 starter: 5.6 years (equating to 66000 miles)So, I'm having some problems finding data on starter life cycle - all I have is anecdotal evidence... *My personal car has 115K miles and is ~8 years old - and I've been doing this since I bought the car >2 years ago. *My last car was sold at 98K miles and this was done for a little less than 2 years (the car was 8/9 years old when sold).*My first car had unknown mileage (estimated around 150K), was 10 years old and the engine was killed at stoplights.*My parents own a conversion van (seldom used now) that is 12 years old, 120K miles - did not shut the engine (v8) down at traffic lights.None of the cars above have had their starter go.*Father had a truck that had it's starter replaced around 220K miles - unknown age. That car left us with a blown connecting rod around 300K milesBatteries... Yes, this does put more strain on your battery... I'll go more into that when I can find some better data (more than anecdotal :p)...But, that's to say... It's economically viable to turn off your engine at traffic lights... So much so, it's illegal to idle (over a certain period of time) at traffic lights in some countries...

Topic by trebuchet03 11 years ago  |  last reply 9 years ago


Faucet night light - water tap

I'm interested in trying to make a faucet night light . (google it in images) - its a brass sill plat out door tap that looks like it has a water droplet and its illuminating GREEN ... I suspect it be fairly simple... to make the light go one or off - with a push button switch ( as the tap is screwed down)  as for teh water droplet any ideas??? I was thinking a  glob of  silicone.. ???? ( Thoughts?) Where would I get the LED from and would it work with 110volts? I figure I could just get a small plug in the back of the faucet ? Looking for thoughts and ideas on how to make it...

Topic by rmwilson 6 years ago  |  last reply 3 months ago


How do I remove a stuck water hose from the faucet?

The housing around the hose seems "frozen" to the faucet.  I've tried WD40 and even a plubmers wrench but still no movement.  Any assistance short of call the plumber is appreciated.

Question by mvv1 9 years ago  |  last reply 6 weeks ago


Is there a better way to protect faucets in a hard freeze than letting them drip all night?

I'm in north Fl. and our hard freeze is about 5 to 6 hours under freezing. The problem with the dripping faucets is that it uses up the softened water.

Question by Scapegoat 10 years ago  |  last reply 10 years ago


Homemade shop urinal?

Any plumbers out there? I know that to some this sounds pretty gross, but I would like some ideas on how this might be done. I am not aware of all of the possible pipe fittings and combinations and ways of hooking things up. I have a homemade "sink" that I made out of one of those plastic storage containers and I have a hose bib as my faucet. As a side note, anyone know of an affordable but efficient "on demand" water heater, for the purpose of washing various shop related things? Anyway, I was thinking that there might be a way to maybe put a 45 degree fitting below the drain and run it out to a point to where it would be easily accessible. I would think that just running the water down the drain would sort of clean the pipe, and I would just have to maybe fill a cup with water and pour it down the 45 after using it to clean that part out. Meant to mention that I'm a man. I'm sure that's a useful piece of information! Also, meant to say that I have the pipe drain going down through the floor of the shop. It's then connected to a 90 and it runs the length of the building underneath the ground. I had drilled holes every inch or so along that whole length so that some of the water etc goes out all along that length and seeps into the ground and not just all the way to the end. Thanks for any ideas.

Question by stevecinstrfme 4 years ago  |  last reply 4 years ago


How can I modify a shallow well pump handle into a usable bathroom faucet?

I have a shallow well pump handle that I would like to modify to make usable as a bathroom faucet. Wanted something primitive but not sure how to make it to work so that the handle will turn the water off and on..... Will probably only use cold water to feed but not sure what kinda adjustment I can make to have a shut off valve....

Question by housewitch77 7 years ago  |  last reply 7 years ago


Low hot water pressure

I the past 4 months I have replaced the water heater, water softener, and the pressure tank. Everything was working fine until I developed a leak in a PVC elbow from the outside water supply As soon as that was replaced and I turned the wter supply back on my hot water pressure dropped to almost nothing in all of the faucets. I am thinking some scale got lodged in the outflow pipe from the water heater and I need to apply high pressure air from one of the faucets to force this out.

Question by 10 years ago  |  last reply 9 years ago


What is this thing?

Newbie here. I found this thing at my local thrift shop. I have no idea what this thing is. It looks like a water purifier, water distiller, or an ionizer but I don't know. There are no brand names on it, except a meyco grommet and a voss band clamp. It has two lights that go in the stainless steel globe that is attached to the main pot. There is a connector that attaches to a faucet. It is very strange. If anyone has any information, it would really be helpful. Thanks. Joshua

Topic by vintagegamingsystems 7 years ago  |  last reply 7 years ago


I want to build a kitchen warm-up water diverter, but I don't know how.

I want to divert the initial cold water when I run my kitchen faucet (to get hot water for dishes, etc.) through a pipe or hose through the kitchen window outside into a rain barrel, and to be able to route that water out to the birdbath to fill it in the winter from indoors, or to water the yard in the warm months. The faucet is way higher than the patio outside, and the patio is maybe 6" - 10" higher than the birdbath so I'm thinking gravity will do it. But I don't have the know-how to construct such a system. It would have to include somehow sealing around the hose leading through the window, as we have cold winters. Therefore I would probably have to address the water freezing and plugging the hose outside.There is an electrical outlet on the outside of the house so I think I could wrap a warming blanket around the hose if necessary. Any suggestions? I have limited tools and skill, but a lot of time and patience. :)

Question by threeoutside 1 year ago  |  last reply 1 year ago


12 Hurricane Preparedness Projects

I read some of the 12 projects. I did one myself since I live in Puerto Rico, went through Hurricane Irma this past Wednesday (Sept 6th) ,have been though several hurricane sin the past (since 1964), and will go through a new one (Hurricane Jose) this weekend. In most occasions, we lost power and water for days. I lost only power for 30 hours after Hurricane Irma. My own project was a two part installation for when I lacked water (I have a generator set for power): 1. Install a 50 gallon cistern on my roof to store potable water for cleaning and bathing needs 2. Install a pressurized 20 gallon tank for showering The 50 gallon cistern was actually a large trash barrel with a removable cover ($40), which I added two 1/2 inch plastic faucet valves, one near the base as a gravity fed output, and one on the cover as a water inlet. After cleaning the barrel, and attaching the valves, I fixed the barrel (now a "cistern") on my roof (over a beam for weight distribution) with two wire guides. I attached a plain water hose from an external faucet to the top valve to fill the cistern. Then I attached a new hose to the bottom valve and ended that with a regular sprayer. I fitted this into the bathroom over the toilet tank and near the sink, so it can be used for face and hand washing, and for filling the toilet tank after each flush. The pressurized water tank is a unused water heater that can hold up to 120 PSI. I replaced the cold water inlet with a cap and a auto tire valve by drilling into the cap and pulling the tire vale through (same as for a wheel hub).. I installed a 1/2 inch faucet on the hot water outlet and a short (pressure resistant) water hose, and finished it with a water sprinkler. Then I installed a.new 1/2 inch valve on the drain.for the lower water inlet.  I attached the hose from the cistern to the lower valve, opened the valves on the cistern output and tank input, and removed the inner stem from the tire vale. When the tank was full, some water will spurt out from the open tire valve. Then I close both valves, remove the cistern hose, reinstall the tire valve stem, and use an electric air pump to apply pressure up to 50 PSI.  Now if I open the water sprinkler, i have a hand held shower!  After one use (about five minutes) the pressure can drop but if I have electrical power, I can reapply air pressure again. After several showers, I release the remaining air pressure at the tire valve, refill the tank from the cistern, and apply air pressure again. This has worked for years, and I keep everything ready for the next storm of when I have no water supply.

Topic by RaymondR6 1 year ago  |  last reply 1 year ago


how to make a custom o-ring for shower deviator

I am in need of an o-ring replacement for an unidentifiable bathroom faucet shower diverter. Unidentified probably means Chinese. And these things often have no product replacement parts. I am sure there must be a way to make a replacement either out of rubber or silicone either by 3D printer or some kind of mold. I would appreciate any kind of help - either someone with a 3D printer who could make one or a mold for silicone or melted rubber. I don't mind paying for this as I'm sure it would cost considerably less than replacing the whole magilla. I'm thinking of the kind of rubber used for bottle stoppers that empty air from wine bottles; or some way to make this o-ring. The dimensions are in the attached images. I an furnish more images if necessary and contact info.

Topic by philjor 4 years ago  |  last reply 4 years ago


Waterspout!

On my way to work this morning I passed an amazing sight: a fountain of water shooting 50 feet into the air. A fire hydrant had come off (I wish I'd seen that bit) and the water from the main was spouting to the sky. I've often been vaguely impressed with the concept of water pressure in cities - it just comes out the faucet! What is pushing it? You used to have to pump water to get it Up to where you want it. This sight really brings that home, the massive pressures running underneath the streets in modern cities. It's highly impressive. When I first arrived there was simply the waterspout, but fire trucks and firemen arrived very shortly and started playing around in the water. One almost had his hat knocked off by it. It wasn't clear what they were doing in there, and I don't know how they were planning to get it under control again. The grocery store on the corner lost its awnings from the weight of water falling on them.

Topic by rachel 11 years ago  |  last reply 6 years ago


What is the best kit for testing my home's water for lead?

Over the weekend, I learned that most lead in drinking water comes from plumbing within the house. from Curaflo's history of piping materials:In 1986, Congress banned the use of lead solder containing greater than 0.2% lead, and restricted the lead content of faucets, pipes and other plumbing materials to 8.0%.This so-called "lead-free" brass can still legally contain up to 8% lead, and plumbing systems installed prior to 1986 can contain high levels of lead from both plumbing components and lead solder. The presence of lead in water from the tap is indicative of serious pipe corrosion that must be corrected for health reasons.So, I plan to test my home's water for lead content. Have you seen a comparison of the various home testing kits? Which one is the best?

Question by ewilhelm 9 years ago  |  last reply 6 years ago


What should I try taking high-speed photos of? UPDATE1Apr10

I took the two photos below last year, and I want to try a few more for a new project. My rig is simply the flash unit out of an old disposable camera, rigged up to a microswitch. For the falling coins, they landed on a tilting platform with the switch underneath, so that the first coin to hit bumped it down into the switch and fire the flash. The droplet was just by setting the faucet to drip and poking the switch manually and getting a lucky shot. I'd like suggestions for what to try photographing next. I'd prefer something that can activate the flash by simply pressing two contacts together (i.e., a switch), as I haven't had much luck building light- or sound-activated triggers. UPDATE so yeah, I totally this in before spring break and forgot to mention it. The project was a magazine cover, don't knock the radd grafics dezine skillz.

Topic by CameronSS 9 years ago  |  last reply 9 years ago


How to Wash a Cat

Let me tell you how I bathe my cat.  This is no fluke. I have even taken a cat to a college class and given him a bath as a demonstration.  If anything would set a cat off, that would. I have even bathed cats that aren't mine. Take a big breath and relax. Your state of mind will influence his. Start with a clean counter next to the kitchen sink. Put towels on it. Don't have them so close to the sink that the cat could grab it.  I generally have the cat facing away from the towels and toward the water faucet.  Don't have him facing you.  He'll try to grab you and climb up your chest.  Get your shampoo opened and handy. Consider which hand will be easier for you to hold the cat and which to wash.  Set up your towels and sinks accordingly. Now, plug the side of the sink you'll be using to bathe the cat. In the other side, start the water. Get it to the temperature you want. Turn the pressure down to a slow flow - on that side. Put your cat into the empty, plugged up side of the sink, facing the wall. I have bathed a cat with and without a towel in the sink. Your choice. Let him watch the water for a few seconds until both of you relax. With your washing hand, cup your hand, fill it with water and "pet" your cat with it. Start on his back, not his head. Do this several times. Slowly move the faucet over to his side of the sink but not ON him. Continue "petting" him with water. If he's relatively calm, increase the water pressure so the sink is slowly filling. Remember, you're washing with one hand and restraining him gently with the other. Put some shampoo on him and water-pet and wash him. Have a little PLASTIC cup handy so you can scoop some of the water from his side of the sink and pour it over him (it has soap in it - might as well use it to the max). Continue washing until you are satisfied that he is clean. GENTLY remove the plug and let the water drain WHILE you are filling that cup with clean water and gently pouring it over him. Scratch and pet him frequently. Talk to him.  Rinse him thoroughly. When you are all done, let him drip a little.  You might want to gently squeeze his legs and tail to 'ring' some of the excess water off of him.  Then put him on the towels and wrap him up gently but quickly. Use old towels. If he has his claws he might snag them a little. Drying is the hardest part because he wants to run away. Dry him as best you can and then release him in a warm room. Don't let him outside until he is dry. I hope this works for you as it has for me.

Topic by lilredcin 7 years ago  |  last reply 4 years ago


(newsletter) Cake Pops, Book Scanner, Office Pranks...

Sign-up for this newsletter: Welcome back! Epilog Challenge - Help choose who wins an Epilog laser cutter! Vote now! Klutz Rubber Band-Powered Contest - What's the best rubber band-powered Instructable of them all? Vote now! Earthjustice United States of Efficiency Contest - Create an energy-saving Instructable and you could win a MacBook Pro! The ThinkGeek Hacks Contest winners have been announced. See who won! Cake Pops Self Watering Garden - Using Recycled Water Steampunk Segway (Legway) DIY High-Speed Book Scanner from Trash Win a MacBook Pro!Closes on May 6! Vote now! Build an Ultra Efficient Fridge Make Delicious Coffee Liqueur Recycled 55 Gallon Barrel Chair Save Water! Kitchen Faucet with Foot Pedal Featured questions from our new Answers section: Physical and electrical engineering. What is a good thing to start with? Can a DC motor from an electric scooter generate power? Homemade Grey Water System Make Killer PCBs Ecological Cardboard Laptop Case Build a Foundry and sand-cast Aluminum Help choose the winners! Sailing the seas for free How to Redecorate the Office ATX Power Supply Mod With USB Ports Make a Female Game Character from Wax Turn an Office into the Beach Sign-up for this newsletter:

Topic by fungus amungus 10 years ago


Why does my LED lamp have AC voltage from case to ground and is it dangerous?

Here's the deal:  3-section under-counter LED light strip in an aluminum housing, with a 2 wire AC cable and plug for 220v. I found however, that when I set a voltmeter to AC and measure between the case and a ground (water faucet, natural gas line or the ground from an electrical socket) I get 74 volts with one unit and 89 with another. The seller first pointed out that a grounded cable should be used. I replied with pictures showing the unit is built to accept only two wire and comes with a two wire cord. Then they said using a sink as ground didn't truly represent ground and that the measurement was faulty and that the current is not dangerous regardless.  I took additional measurements using an electrical ground and the metal pipe from the natural gas line. Same result. However, I'm having trouble measuring current. I put the probe into the ten amp side, set the meter to the mA/A position and got nothing, although I did hear a buzzing sound emanating from the lamp housing--that can't be good. I then put the probe into the mA socket and tried again.  Same buzzing, no reading.  My questions: 1. What's wrong with my setup that I see no current measurement.  2. Is this a dangerous lamp? I took the one near the sink down. The other one is not within reach of an accidental grounding, so it is up until I'm ready to return both units. -Bob

Topic by bobcov 4 years ago  |  last reply 4 years ago


Arduino-Based Solar Heater for My Above Ground Pool

A few weeks ago I grabbed the garden hose to top off the pool and noticed how hot the water was as it came out. (the hose had been lying in the sun). So, I decided to put it to good use. We've been looking at solar heaters for the pool but found the prices prohibitive, and being a DIY'er I decided to build my own. I have 50' of black, tangle-free hose coiled on a 2' by 4' piece of Wolmanized, 3/4" plywood. This is perched on top of an 8' 4by4 post which I sunk into the ground near the pool's filter. To feed the hose I installed a faucet in the filter's return line which is under sufficient pressure to travel up and into the hose. The other end comes down to an electric valve before emptying back into the pool. The Arduino portion of the project consists of an Arduino Uno board, a DS18B20 temperature sensor probe, a 12-volt, 3-amp power supply, A small prototype board that holds two 12-volt relays and two 2N3904 transistors which the Arduino triggers, two 12-volt car-type relays which are triggered by the smaller ones, and a Mallory Sonalert. My idea was to have the Arduino monitor the temperature in the return line from the solar hose coil, and when it reaches 80 degrees F, the Sonalert goes off for 5 seconds to warn swimmers that hot water will be coming out of the return spout in the pool. And after the warning sounds, the electric valve then opens for 2 minutes, flushing the warmed water into the pool. Since the system is driven by the pool's filter, the solar hose is replenished during this flush period, and when the valve closes, that new water is then heated, and the whole process starts over. The Arduino code consists of a couple libraries to incorporate and read the temp' probe's output, a subroutine which tests both the Sonalert and the valve when the system is first plugged in, and then the necessary code in the Void Loop section which simply waits for the temp' to reach a preset level and then sound the alert and then open the valve.The system is built into an 8" by 6" electrical box that mounts on the 4 by 4 post just under the solar hose panel.The systems been up and running for about a week now and I've averaged about a 2 degree rise in the pool's water temp' per day.If anyone is interested in seeing photos of the project, or the Arduino code, I'll be happy to provide. UPDATE: Here are some phots of the project...

Topic by bnelson218 11 months ago  |  last reply 11 months ago


Help with capacitor basics? (the math part) [ANSWERED. Come here for the proof if you want it!] Answered

I understand the operation for capacitors, which make a lot of intuitive sense to me, and seems deceptively simple. I know that the derivative  of the voltage across a capacitor (the slew rate, if you will) is proportional to the current, for a given capacitance. So when the voltage is not changing much, like when it is connected across power supply rails, and the capacitor has little-to-no current flowing through it, and it appears as a high impedance. Fair enough. And when I am winding up the wick on the constant-voltage power supply, so that the slew rate is constant, and the voltage is changing at a constant rate, the current will be relative to how fast that voltage rising/falling. Again, that makes sense. I have proven that to myself time and time again. The technical math way of showing all that is this:          dV/dT * C = I or with units plugged in: d(volts)/d(seconds) * Farads = Amps (or something like that)   Likewise, I know that I can do things in reverse, and that forcing a controlled current through the capacitor, that the slew rate of the voltage across the capacitor will be proportional to that. In other words; the voltage will be integrated over time (as it steadily rises or falls). I do not like integrals in math (esp. when they require by parts or partial fractions!), but the concepts do come in handy in practical design! This is also my 2nd favorite way of imagining what an integral are! (My favorite is actually the water cup or well analogy, where a water faucet or hose is a function, and a the level of water in the cup, pool, well, etc. is the integrated result. That makes the function of integrals really clear and deceptively easy LOL!) So, I basicly have been trying to figure out how to take these simple, easy-to-understand relationships, and take ohms law, and have a super basic RC circuit, with 5V, 5 ohms, and 0.1F. I have so far figured out how to take ohms law, substitute I in the capacitor formula, and get a function. HOWEVER, this is where I get stuck. -------------------------------------------------------------------------------------------------------- Here is the circuit:            +5V---(V2)-----/\/\/\/\/\/----(V1)-----| |-------0v----(grd) So after having a bit of a think, I have figured out that I really need to account for 2 different V's. The 5V power supply, V2, and the voltage across the capacitor, V2. I know that the current flowing through everything in a series circuit is the same, so then I can easily figure out current by calculating the voltage drop across the resistor which is this:            I = (V2 - V1) / R  So now, lets plug that into the mysterious capacitor derivative thingy: (All I did was substitute the I in the capacitor formula with the that ohms law formula above.)           dV(1)/dT * C = (V(2) - V(1) ) / R. -------------------------------------------------- Now, I just plug in the values, and simplify as much as I can, to make it more friendly to my eyes. C = 0.1F, and R = 5 in my case, since I am using a 5 ohm resistor, 100mF capacitor, and I know V2 = 5V, since that is the output of a 7805 voltage reg.           d(V(1))/dT * 0.1F = (5V - V(1) ) / 5ohms. That dV/dT is a bit hard to look at, so I will use V prime, or V' to represent that instead:          V(1)' * 0.1 = (5 - V(1)) / 5 I do not know how to simplify that further though, to end up with that weird inverse exponential curve that is the time constant thingy, with that decaying charging curve. I have V on one side, and V' on the other side. :( So this is how far I got:        5 + (1/2 * V(1)') = V(1) EDIT: I HAVE ADDED THE PROOF HERE IF YOU WANT IT

Question by -max- 4 years ago  |  last reply 4 years ago


Is my book good ?

Well i hate to bother anyone but can you please take some time to read this book i worked hard on ? i spent  countless hours of my free time over the weekend developing the plot and creatures so can you please take some time out to read the whole thing tell me what it needs or what would be good i already am 16 pages into the sequel so tell me if this is good so i can post the sequel ! enjoy Times come by Alby Chapter 1- beginning It was the night I would never forget,the night.......i....the......the last night I would enjoy life. It was spring of 2017 the night air was heavy in my lungs and you could faintly smell the BBQ and charcoal smoke from cookouts that died down hours ago I could here people talking and having a good time but I think my drink I grabbed the wrong beer it was Sarah's it was spiked I never would have noticed who did it at least it wasn't her to drink it. I simply enjoyed the sky line of Chicago filled with sky scrapers and mirror like office buildings it all seemed like a Bokeh picture to me the drug is taking affect on my body I feel dizzy . I hopped on the train, it was empty as for the weather gave a good reason to walk but I needed to get home safely. In about 30 minutes I was home. I clumsily walked up the stairs and almost fell it took about ten minutes before I opened the door, I then plopped down on my bed and ran to the bathroom and regurgitated everything I ate that night. i starred at the ceiling. I saw every detail to the nearest centimeter and then blurry the specks the marks swirled in my vision and I felt weightless for a while. I starred at the clock and noticed it was about 4:00 am and cursed myself for going to that bar with Sarah I threw up all over my bed. I tried to grab the phone to call the paramedics but I fell and hit my head on my night stand. I passed out from the concussion i fell into a deep sleep a very deep sleep. Chapter 2 Change I wiped the crust out of my eyes and felt my head a sharp pain rippled thru my scalp it was a Gash about two inches in length. i walked into the bathroom I pulled the faucet but all that came out was a wisp of air. I snatched a baby wipe and cleaned off my face I cleaned my wound with alcohol the sting ive gotten used to I used to get hurt pretty bad in the army, I got shrapnel in my knee and they sent me home the first year. I noticed a dead silence on the street I thought they probably closed it off for some type of repair. I put on my white tee shirt and noticed its softness and how it fit snug on my semi-muscular figure I was in good shape for a twenty-four year old, my mom would always tell me most of the people in America are fat but I guess she loves to tell stereotypes for what they are. I put on my jeans and not forgetting the belt this time either. I snatched my keys off the kitchen counter and headed for the door. I walked outside and paused too look at the empty streets filled with litter and carnage . My mouth wide open in amazement I asked myself what happened and pondered the different reasons riot,panic,fire what could cause such a mess, I walked towards a police squad car and smelled something rancid I slowly proceeded, I instantly veered back in panic I could not believe what I saw a dead police officer lying face down with half a chunk blown clean off his head. There were pieces of it every where splattered on the windshield and door of the police car and some on the concrete. I instinctively inched towards him and thought to myself that something bad is happening and I need protection. I unhooked his holster off his waist and placed it on mine I pulled off his Kevlar vest and put it on weirdly enough it barely was messy or smelled bad. I checked the pockets of the vest and took out a pair of keys I knew it belonged to his squad car. I first popped open the trunk and saw it glistening in the sun a Ar-15 assault rifle. I picked it up and the memories of my army training it just instantly popped into my mind. I guess it applied the same here, I slung it around my back and walked into the silence. I took out the pistol put in the clip pulled the slide back and switched the safety off and cautiously held it. I believe the gun made me more nervous than whats in the shadows, I walked down the narrow street and saw it the skyline of the city filled with smoke and fire. I stood in anger and confusion my home town ravaged broken and charred blood stained the streets and walls, but why.....why....how could this... I mean what could....d..do such a thing. I walked away in the opposite direction and then cut into an alley way to piss and paused as I heard a roar I looked up and saw a quick glance of the belly of a apache attack craft it quickly zoom by and then another. I looked away and ran out of the alley and then down the street to see what direction they were heading. They sped towards the lake area and then I saw a tiny black object fall horizontally from the choppers belly and it slowly fell, then a explosion. I could feel the vibrations. the explosion ripped the lake area into nothing....nothing..but....but...smoke. My heart skipped a few beats thinking what if the next one falls in this area I quickly broke my daydream and bolted as fast as I could as far as I could until I saw a woman crawling on the concrete she was Moaning and holding her stomach. I came up behind her and asked for help. She turned on her back “ Sarah? Ohh my god sarah are you okay ?” and she held a gun in her hand a Glock 22 model the slide locked all the way back and no clip in the gun. I kicked it out of her and and sprung on her she begged for mercy “albert you have to stay away from me im turning” she saw that I was armed and quickly told me the gun was unloaded and that she was sorry she told me she would do anything just get away from her . I told her “Im not here to hurt anyone I just want to help” I starred at her beautiful figure her perfect face and thin hourglass body but ragged cloths and red eyes from crying. How and what did she go thru that could turn her into such a wreck. She got up and put her arm around my shoulder kissed me on the cheek and passed out. I dragged her to an fenced off alley where there was a mattress I put her down and sat next to her .she hugged me and began to cry she than jumped on top of me “Sarah what are you doing no we cant do this now no!” I told her I will help her but I dont think she understood a word I said. She looked at me in my eyes I could feel her touch my soul, her blue eyes glared in the sun. “i dont want to die alone please” I stood up nervously, I was concerned for her health when suddenly I heard a bang then felt a sharp pain in my leg. I collapsed in agony and saw the cause of my pain a bean bag round I looked up and saw a gas mask wearing figure he shot me with another bean bag round in the knee, from his shot gun he then walked over my numb body and. picked up both bean bag's and threw it aside two people in hazmat gear grabbed Sarah and took off her clothing I screamed “what are you doing to her!!!” they did not acknowledge me they looked at her body like they where searching for something. Her passed out figure limp as a rag doll they removed her pants then her underwear I screamed “No!! you son of a bitch don't do it ill kill you” they studied a bite mark on her upper thigh they made some type of hand signal and left. the soldiers then they came and started pouring gasoline on the mattress and her body. the one with the kriss super V took his cigarette out of his mouth and then flicked it at her it rolled of of her shapely belly and hit the mattress her body bursted into flames and she spasmed and kicked wildly. Then the man pointed it me and said in a British accent “ knock that fuckin Yankee an put em in da ACP double time, thoes hungry bastards are comin” Chapter 3 world gone mad I awoke on a bed in clean clothes and a hair cut. I stood up and walked into the hallway and noticed that this was a hospital. Suddenly a hand grabbed me. “aey where do you think your going ya damn runner rapist” I starred at him & his arrogant look and heavily customized ACR bushmaster. “get the fuck away from me im leaving what ever the hell this place is” he then sprung up and pushed the barrel of his ACR into my neck. “look if you want to get devoured by those runners be my guest buddy but dont go exposing this place to the infection” I looked at him like he was retarded “infection what infection and why the hell is the army bombing populated areas” he looked at me the same way. “ where were you 2 days ago ? There was a virus it was originally H1N1 but it evolved up to 10 times now its got Chicago by the balls and its spreading across the world as we speak turning everyone into animals devouring and ripping people to shreds and then the virus takes over the dead body and brings it back as a runner also know as a fresh undead body that has the ability to run or sometimes sprint god forbid but after 2-4 weeks without food the tissue breaks down from constant use without fuel and they start to get slow and shuffle around” my mind felt overwhelmed I wondered how my parents were doing in Dallas. “so what am I supped to do here but be a waste of space” he grinned. “well you obviously know how to use a weapon and our records say you have been in the military. you cant take care of yourself out there so we will make you part of out kill squad. “kill squad ?” “ohh shit you mean you have never killed or seen any infected yet ? that means your fresh you can be put to good use in our kill team” he told me his name was henry the specialist of his team kill team Charlie-mike. He directed me to the staff sergeant who looked at me and said “well well well we got some fresh meat hope you ready for 3 months of hard core trainin cuz this wont be easy now get yo ass in the garage and clean every APC tire the armory I think the kill teams ran over a little too much runners” 3 Months later........ the training was more rigorous than the basic military stuff a the armory where there was at least a 100 others conversing and grabbing into boxes of gear. Henry took me to the gunny of the armory where he helped me choose my gear. I picked up dragon skin Kevlar with implanted ceramic & alloy inserts. I took some gloves which I cut the fingers of. My boots where the basic digital camo color probably a left over from the war in Iraq which ended several years ago when our president simply drew the troops out. And European troops and some Russians finished off the big time terrorists soon after we heard no more from any our genocidal efforts finally payed off. I went to the weapon stand where I had to fill out a ID sheet to make sure they knew I had training with combat rifles. I chose the ACR which was in stock by the thousands as a gift from the weapon companies to the American army. I pulled all the safety clips and then grabbed a eotech scope out of a box and locked it onto the rail system of the weapon. I attached a mag pull the every one of my carbon strength reinforced clips. The gunny looked at me with a grin and we left for briefing. Chapter 4 things get messy we met up in the garage of the hospital every runner hunter of this kill force a total of 300 men and women in the huge elevated parking complex of the hospital, a general arrived in the elevator his chrome glasses shined in the evening light so did the many badges pinned on his suit which fit his old figure rather awkwardly. he had two formally dressed men with him they both had desert eagles on there side holsters but the general had a FN 2000 slung around his back. it was worn and scratched its polymer body was embedded with and insignia that I did not see so well as it was obscured by the scuffs and grime he looked at us and smiled his mouth opened and he flung his cigar off the ledge of the building he then begun and explained in a dominant voice. “there are 40 spec op Humvee's set up in formation ready to patrol the streets of Chicago you all will be in sector 6 the most dangerous sector of Chicago but no need to worry we have full fledged firepower of 4 APC's which will Carrie your kill team to your objectives take as much time as needed the runners arent going any where. you will clear the sears tower area a hot spot for runners. look all you men and woman, its time to revolt and fight back. its time to say we will not be scared, we will not be intimidated, we will win back our freedom!!” the whole complex light up with cheer. As the two men in formal wear took out PDA's and started directing people to there kill teams the first man shouted “ Chavez,Williams,buck, and,Samson go to APC #1” I quickly advanced thru the crowd to APC 1 I slowed my pace and saw its matte paint job of digital camo and its pop up dillan machine gun turret mounted on top. I pounded on its steel behind and its back door unlatched I stood waiting for the rest of my team I saw all three walking in a line towards the door I saw him ,the man with the kriss super V he smiled at me and said “no fuckin way you tha yankee we picked up in tha alley way you mad cus we killed your little runner girlfriend” I sprung towards him and grabbed his collar and punched him in the stomach then elbowed him in the mouth all the color drained out of his face. “ if you wouldn't of shot me with a fucking bean bag I would of blown your brains out back at the alley” he looked at me and with blood dripping down his mouth “i was just doing my job. welcome to foxtrot 3 by my names john samson you can just call me hunter” I let him go and he limped into the APC then another walked towards me he wore a Grey baklava and tight fitting clothing and a vest that barely covered his chest which awkwardly bulged out he walked towards me and took off the mask. She looked at m surprised face and said “what ? a woman cant be in the military” “well I..I...I just did not expect to have such a high rank personnel on our team” she looked at me and frowend “were both specialists grade one my names Kelly williams” “a heavily armored male in a hijab walked towards me playfully he came up to me and pulled off his hijab he was a African American . “hey specialist now look Im basically here to keep the moral you catch me ? I was in the navy im Ricky buckman Just call me squid now what do you want to go by kid?” I smiled “echo” “nice choice” Albert “echo” chavez I thought in my head I figured that sounds good. We all jumped in the APC while a kill team of rangers in a heavy Humvee with a mounted sentry gun rolled behind us as the whole convoy of kill force 6 prepared for battle. I thought about all my training aim for the head,short controlled bursts a shot anywhere else just stunned them. They move fast so they have to be neutralized if you get bitten or infected kill yourself with the poison capsule that was given or a team mate would do it. I grabbed a Kukri blade off the weapon rack that was provided in the APC I looked at its razor sharp edge its brushed steel surface reflected no light I sheathed it and strapped it to my leg. I caught the eye of Kelly who was fiddling around with the UAV control panel she looked at me and smiled. The APC's lights blinked red prompting us that we are in a hot zone. The APC vibrated as the co pilot took out a pack of runners with the Dillon remote controlled mini gun. We all loaded our weapons and packed up some ammo. Hunter and squid looked at each other and they bumped fists. I put a clip in my ACR and cocked it I turned on the eotech scope and strapped on my helmet and then slid on a black baklava. The APC driver prompted a alarm which was the signal that the door was opening, the big metal door slowly lowered its platform to the ground and we all got out Kelly was the last one out she grabbed that control panel and slid it into her bag she ran out and flipped the close button on the APC. We met up with the four other teams in our sector who already exited there Humvee's. A black Humvee that I never knew was in the convoy rode up and a military adviser jumped out and barked orders like some scared little dog and then jumped back in glad that he wasn't us. He positioned eight snipers on the roof who where each divided into teams of four they zip lined up the roofs and soon each team where picked up by two little bird helicopters the rest of us where on the ground either Humvee calvary hit teams or long range grenade support foxtrot was positioned on the magnificent mile at least it was magnificent. We cautiously walked down the street with another team of 6 watching our back and little birds with snipers covering us and telling us where the nearest pack is. It was empty until we got a report a pack of twenty runners where heading straight for us about 3 blocks away we had about a minute to prepare, snipers took out some and only six broke there steady aim and where 5 feet away, I drew my weapon and just before I could fire a Humvee rammed half the pack of runners over my team shot at there heads to finish them off . I stunted back and fell startled by a runner with broken legs dragging its smelly corpse towards me, my team did not even notice as they where pre occupied with finishing off the pack it grabbed my boot and pulled itself onto my chest I pushed it back and hunter tackled it and shot it once it grazed its ear he then rad up to it and curb stomped its head in over and over, like an egg it crunched under his boot he then walked towards me and picked me up and then our comm's screeched with a danger code: sector red REPEAT SECTOR RED!! this is not a drill!! squid looked at Kelly “OH shit radio the APC radio the APC!!” Kelly hastily radioed the APC and it arrived around the corner ASAP she got in and took the panel out of her backpack all the rangers got back in there Humvee's and formed up a line of vehicle's and the APC was in front we all jumped in and squid popped open 3 of the four combat hatches. We took stance and poked our body's out of the hatches while Kelly was typing away at the panel. “Kelly get us that predator drone NOW!!” “on it Echo..about.....NOW!! get ready for some boom boom boys” she said over the comm a predator drone deployed from a building somewhere and roared across the city's night sky. The little birds shot flares into out immediate area and the military advisor said nervously over the comm “formation green zone ASAP make space for one more hummer!!” his hummer screeched into our circle formation at the middle of the block intersection. We all could hear the uproar and the screaming rage of the Runners it was 9:00 PM and my stomach dropped as runners came at us from every angle swarming in between all the vehicles as we took out as much as we can the advisor yelled. “Break formation head for lane 3 of sector 5 Kelly yelled “but thats a dead end we have no where to go !!” “exactly now MOVE !!” we hastily rammed out way thru the crowd of runners it was easily about 200 to 300 runners we reached the street which was a dead end it was blocked by a collapsed building from all the beach bombing runs. We waited for 5 minutes until we saw it our doom three times as much runners appeared and headed for the convoy. The driver looked bewildered “Get ready im breaking position” he advanced the APC towards the crowd its massive tires gripping the rubble and concrete so agile and quick. He opened fire the Dillon mini gun until there was not one round left. the APC swiveled madly like a dog chasing its tail, all the blood and body matter stuck to the tire made it impossible to control. The whole interior rocked forward on impact with the flipped car. suddenly a screech and the APC flipped over on its side. the runners ignored the APC and went for the group of Humvee's ripping the rangers out that had not locked there Humvee door and devouring them. We herd the screams despite layer after layer of Kevlar and Armour of the APC. My radio started to squawk. “ Pindad Panser down repeat,flipped on its side calling in little bird for support !! bring in UH-60 shadow for medivac ASAP!” I groaned in pain the impact was hard,i could taste blood in my mouth my world was spinning. my team mates did not move they where all laying face down. I soon passed out Chapter 5 delta crimson “Delta crimson GO GO GO !!” I awoke in a sweat, I felt normal again I wiped my blood crusted face off. I leaned up and saw them. “Squid Kelly Hunter Your all alive !” hunter smiled “the crowds not givin up. Hurry mate we got to get outta this APC or crimson is just gonna have to save us” Crimson was an elite rescue squad of some of the best rescue force members in the military marines,rangers,green berets, you name em they can save you. Suddenly we heard the roar of helicopters. Then the door of the APC light up and blew of its hinges a soldier in a crimson baklava shined a light me and my team he latched two metal hooks onto our APC and then the helicopter lifted us into the air, this vehicle the best attack helicopter crafted by the engineer crew over at Hudson base they called it the Shadow because thats all it was, a quick killer in the night. A man made machine manufactured to kill and thats what it was best at. I broke for the chopper and jumped in then squid then Kelly it started to take off right before it left ground hunter grabbed the bay door and climbed in. “forgetting something ?” He threw me my ACR bushmaster which started to look like the generals FN 2000 it was scuffed and marked in every crack and crease. A crimson medivac specialist handed us some refreshments and snacks he said he picked it up at his last raid. He gave me some meds, adrenalin shots use them as a last resort of energy he said. I looked at squid who was holding his dog tag “ man echo you see how that APC flipped on us I almost crapped my pant's” I laughed at the joke even if its not funny my team needs the moral. I looked it the pilot he caught my stare. “where going to the main objective” I sighed and looked away hunter looked at me and made some type of hand signal. “hey Kelly you think we could of died back there” “easily hunter luckily the runners did not find our APC interesting” I looked over at Kelly who was looking at the cracked screen of the control panel. “hey Kelly what all did you use that panel for” “i saved the whole platoon with this thing while you where taking a nap, now its gone and base is a long fly away. The screen broke when the APC flipped. And the predator drone crashed without me controlling it” “damn, nothing good ever lasts long does it” “well echo thats not true your still alive aren't you ?” I we both smiled and when the happiness broke it was back to work. chapter 6 Raid The shadow landed on the roof of a building about 3 blocks away from objective R.R.T.R (runner ruled territory raid) our forces had to kill all runners and take back the sears tower. Kelly was stationed on the roof with hundreds of other snipers .with her barret M82 which ripped into 2 to 3 runners at a time with its large caliber amour piercing rounds. Military advisors sent Ground troops they marched the streets for the main attack on the R.R.T (runner ruled territory). Soldiers of all pact creed and faction marched side by side. the ISF (Iraqi Security Forces) the IRA (Irish Republican Army) even the CIA and DEA forces were marching along with whole police precincts including the bulk of the U.S military. This battle was inevitable and we are going to win.

Topic by albylovesscience 9 years ago  |  last reply 7 years ago