The idea is to use a voltage divider with high value resistors and then rectify the signal. Is this dangerous?
Topic by flagrantfouler | last reply
I have been running through example questions for an exam I have coming up; the following picture is a condensed version of half a page of working. My lecturer gave us the solutions and a few steps between beginning and end to get to the solution so we could work it out. However, as you can see the picture below I got 30.6A whereas she wrote 54.2 down. The problem is to "Find the maximum values of the average" (done this bit) "and rms thyristor currents for any firing angle, alpha.". The values of R and Vs are in the diagram. Alpha is assumed to be 0 since then the thyristors will conduct for the greatest possible length of time. I think she may have got to the end then forgotten to square root of Pi before multiplying Vm/2PiR by it. Does anyone agree?
Question by Jayefuu | last reply
Hello guys, I'm working on a knex gun now, but I have a question about how to get the max. power out of a ramrod. So when does the ramrod give the most power: • 1: The ramrod hits the ammo and doesn't go further • 2: The ramrod hits the ammo and still goes (a couple of centimeters) further Thanks in advance, Bobbienator
Question by DELETED_Bobbienator | last reply
My brand new Ryobi Power Saw just busted. I turned it on with the wood in so the saw blade was stuck. Pretty soon the motor just stopped and won't even make a sound . It's shot. But what exactly is shot? Can I replace a part?
Aside from it being an ugly hack, is there any reason I can't strip the wire back from the end of a printer power cable and solder it to the plug terminals of a 5v wall wart transformer? This shouldn't be a fire hazard since the power cord should be rated correctly, correct?
Topic by randofo | last reply
Hello im realy new to the electronics game and i was wondering if anywas can sow me a REALY SIMPLE diagram of where wires should go to get powered speakers i have 2 speakers and want to power them by battery so a nice little circuet diagram would help:)
Topic by wii maniac | last reply
Since I was thinking of building a bipolar power supply +12V, -12V, using a 12-0-12 transformer and using only diodes and capacitors, which I have successfully built. My problem is how safe can this power supply be? since I am not using any regulators?
Question by VAustin89 | last reply
Hi all. I have a really old dell laptop(given to me) that is missing a power supply. It requires 20v and 3.5 amps to run. I want to make a digital picture frame out of it. I wont be using the battery or cd player and maybe not even the hard drive(not yet decided). Any idea's on what to use as a power source? I don't need to charge a battery just need power. Could I use an old pcu? I know that I could combine the two 12v lines to get 24 ish volts but won't that fry the old thing? I don't want to buy a replacement power adapter cause it is so old and may not work anyway(plus I wont lie I'm cheap lol). Any suggestions?
Topic by jmiller634 | last reply
OK so recently I have noticed that almost any sort of power can be converted into a different type, sorta. Anyways, it takes power to create radio waves or any wireless wave. Would it be possible to just send out plain radio waves and get something to pick them up and convert them into usable power? Now I know the farther you were from the source, the weaker the power would get, so you might have too send out a fair voltage signal to get some good range. Also, would it interrupt any electronics in range or anything like that? I was just thinking about this and wondering if it is even possible to get actual wireless power around your house or something without using batteries or interrupting anything in your house. Thanks.
Question by noobererer | last reply
----- Click Here for Full Story -----We may be able to say goodbye to power cords in five years, as Intel has developed a system called WREL (wireless resonant energy link) that could possibly run electronics without having to find a wall socket."Wouldn't it be fantastic if we didn't think about where the power was coming from and the power was everywhere?"said by Intel boss Justin Rattner in an interview with BBC. Rattner explained that through Intel's idea of "magnetic induction", the power source can be tuned through a resonator, enabling gadgets to receive power wirelessly. The report further explains:"Power is put into magnetic fields at a transmitting resonator - basically an antenna. The receiving resonator is tuned to efficiently absorb energy from the magnetic field, whereas nearby objects do not."Of course, there would be issues at hand if Intel's technology breaks through the mainstream. How are companies such as Monster Cable going to fair if this new possibility rises? Well, we'll just have to see until then.Just how long till someone makes this cheap?
Topic by Keith-Kid | last reply
I have a battery powered laser on top of a spinning disc. This laser runs out of battery fairly quickly, I need to make it last longer somehow. Could I wire the laser to multiple batteries to make it last longer? If i manage to find a mains powered laser then it spinning constantly wouldn't work as it would have a wire. I ideally need to find a way to power this laser (probably 2 lasers) for most of a day with something that fits on a fairly small spinning disc. Any ideas? Cheers
Topic by happysnail | last reply
What I am trying to do is built a LED board that beats to music. I have found many way to make it beat to the music, but my problem is I don't understand how to power the LEDs. I am new to building electronics, and I am still learning. Anyways, what my hope to do is use build a board 46in long running one LED per inch. This will be dived up into smaller sections to run different beats off my home theater system. I am trying to run all of this using 4 TIP31c, and I understand how to use them, I just am not sure how to power this. Thank you!
Question by Togroovy4u | last reply
Hello everyone I recently found a 12v 9a.h battery in my stuff and now i decided to make a portable power bank with it.this is what i am thinking about:i want to make a portable power bank with several voltage outputs for using in car and etc. 1- I want to get a 5v output and use it to charge my devices when I am in a car.2- i want to connect some power led lights so that i have a light bar.3-maybe I also connect an amplifier to it to play music when walking or etc.now that you understood what i want to make these are my problems:1-when the battery slowly drains and the input voltage decreases will the output of the charger module also decrease?2-different devices need different currents for charging for example my tablet needs 2amps while my phone needs 1 amp. do i need to set the output current to any special value?3-what kind of solar panel will be suitable to charge the battery?
Question by Electronic guy | last reply
I have a 1.2 V nimh battery and a 3.7V li ion (no protection circuitry) battery, which would add up to 4.9V if put in series. However, I want to turn it into a temporary USB power supply (5V) so ignoring all the things regarding putting 2 batteries of different capacities together, is there a way to kick the voltage up a tiny bit? I was thinking something like filtering the output of a joule thief, possibly. I also have a solar panel (4.5V, ???A) and was wondering if that could help, but I don't want to rely on it too much.
Question by .Unknown. | last reply
Here's the challenge:I have a Belkin SportCommand iPod Remote and it works great. However, it uses the iPod's connector port and draws its power from the the player. I have this thing installed on a waterproof boombox that needs to play tunes for 8-10 hours at a given time and I don't want to have to open the box AT ALL (lots of water + electronics ...).So, I need a way to have both the iPod accessory plugged in and, at the same time, charge the iPod from a 12v power source (like most car stereo iPod adapters do. I think this is as easy as a little plug to go inbetween the iPod and the accessory, but I can't figure out which pins to tap into. There are a lot of different power pins on the connector, and I need to know which two (ground and V+) are the *charging* inputs.Ideas/suggestions/comments? Thank you!
Topic by tridens
I was cleaning my room and found a load of blank CD's. It made me think of all the AOL discs that my house used to get. So I got to thinking - There's a lot of power wasted on these things, right? So, my job for you, Instructables users, is to help me engineer a way to use these CD's to generate solar, wind, tidal, geothermal energy, whatever. Anything renewable. Any ideas?
Topic by A good name | last reply
I have looked at lots of Instructables and websites, but there is a 50/50 split that power flows positive to negative and negative to positive. Which is it? I use both, depending on the circuit I am building it is easier to build one way over the other (NPN and PNP Transistors usually) But I have heard that it used to be thought that positive flowed to negative but I have since heard that the new idea is that it flows negative to positive. I know that everything is supposed to flow from higher concentration (+) to lower (-) but we could have batteries labeled wrong so I don't know. Very confused.
Question by Electric Spectre1 | last reply
I have been thinking about this for a long time now and in therory it works. What im wordering is if you could make it work in place of the traditional power outlet. Here it is, basicly there are just coils of wire inside of a transformer, on coil has say 240 turns of coil. Inside of this coil is another coil with 240 turns also. So the voltige inside the first coil will be the same as the second coil. And to half the voltige in the first coil. If you had a plug that was just a cilender with a coil of wire inside and an outlet that was a hole in the wall with a coil inside. I know a hole in the wall with 120 volts running through it sounds scary , but put a plastic cylinder inside the hole and vurtaly no shock hazerd. sorry for the spelling errors spell check was not working.
Topic by Laserman595 | last reply
This is what happens when I get my hands on C.A.D!!!! And this is a pic of the RC plane I am in the works of designing. I dont have the ratios to make everything the proper size so I had to estimate. I plan on having it done by the end of my school year in September.
Topic by Pat Sowers | last reply
I am attempting to calculate my amp need for my garage in order to set up a 12v battery system. Using the formula; Watts / voltage = amps drawn, I have hit a question. If using a 12v battery system and converting to 110v, should I be using 12v or 110v in the formula?Example; 100 watt light bulb / 110 volts = .91 amps. Nice!But if I use the 12v; 100watt light / 12v = 8.3 amps.I'm believing I would be drawing 8.3 amps from the battery to power this light.Plus the converter draw...Please tell me which is correct?
Topic by olddawg | last reply
I want these so badly, and I live relatively close (about 300 miles away).http://cgi.ebay.com/Qty-46-Pulse-Capacitors-7000v-230uF_W0QQitemZ200268515465QQcmdZViewItem?hash=item200268515465&_trkparms=39%3A1|66%3A2|65%3A15|240%3A1318&_trksid=p3286.c0.m14You can make one heck of a capacitor bank, releasing almost half a megawatt in a split second.My only problems:I don't have 1600 dollars, crycry.These things are so large that if I were to line them up side by side (so that the thinnest parts create the overall thickness) it would be 25 feet long, 14 inches wide, and almost a yard tall. THE POWER BOGGLES THE MINDI'm so mad, if I was an adult I'd buy these in a heart beat... sigh... deal of a life time... I hope not...and best of all, they are PULSE CAPACITORSthoughts? comments?
Topic by guyfrom7up | last reply
I cdnuolt blveiee taht I cluod aulaclty uesdnatnrd waht I was rdanieg. The phaonmneal pweor of the hmuan mnid, aoccdrnig to a rscheearch at Cmabrigde Uinervtisy, it dseno't mtaetr in waht oerdr the ltteres in a wrod are, the olny iproamtnt tihng is taht the frsit and lsat ltteer be in the rghit pclae. The rset can be a taotl mses and you can sitll raed it whotuit a pboerlm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe. Azanmig huh? yaeh and I awlyas tghuhot slpeling was ipomnartt! Can you understand this? Does it make any sense? I know I could read it. Can YOU? NOTE: Yes, this is more legible than certain Instructables and forum topics are. Irony?
Topic by whatsisface | last reply
I want to get these 12v solar battery chargers they come with alligator clamps to hook to the battery. i want to get enough for 200 volts so how would i hook the solar panels in series, and do i need a controller for each battery? and how would i rig that up and how can I get it going into all the 12 volt batteries without any damage to the batteries etc. And can this be done for less than $400 if the solar panels are $30 each and the batteries are $14 each. THANK YOU!!!! THANK YOU!!!! THANK YOU!!!! THANK YOU!!!! THANK YOU!!!! oh and could you give me links for all the stuff I'm gonna be buying. THANKS!!!!
Question by jimmerforpoy | last reply
Last time I tried to do my own homemade project I failed utterly, I think mostly because I had no idea what anything was (if you saw my last topic on a distortion petal, you know what I'm talking about). I decided instead to buy a book (Tab Electronics Guide to Understanding Electricity and Electronics by G. Randy Slone) which has projects in it, the first one being a power supply. I haven't started building it yet (waiting until I get back to the city) but I've started looking up parts. The thing is, I can't find a 4400-uF 50-WVdc capacitor anywhere! So my question is, can I just put two 2200-uF 50-WVdc capacitors in parallel to do the job of one of the 4400's? That isn't my only question, just the first which I'll ask later in this thread. Thank you (PS: Has anyone had a problem with using Chrome and entering text into these fields? I had to switch to Firefox to get it to work)
Topic by gohuskies | last reply
Abro este foro en celebracion de la inclución de los nuevos países de habla española como admitidos para poder participar de los concursos y retos. Sientanse libres de compartir sus proyectos en español . Recordemos que somos ciudadanos del mundo. Hagamos sentir la magia y creatividad del Poder Latino ! Take that Mr. T. https://www.instructables.com/id/Walnut-SeasonTemporada-de-Nueces/ https://www.instructables.com/id/SAWDUSTOVEN/ https://www.instructables.com/id/HAWKEYE/ https://www.instructables.com/id/DIY-Hobbitss-Pipe/ https://www.instructables.com/id/Black-Walnut-Seed-Ring/
Topic by Mr.Sanchez
I have plans on building an electric go cart, however, the only motor I currently have is mains powered, as such I was wondering if anyone knew of any ways to convert mains powers to battery power, hopefully car batteries as these would be what I using. I've searched high and low and can't seem to find anyone that has done this, let alone a tutorial. Anyone with any idea's or links would be very helpful. Thanks in advance.
Question by ads100 | last reply
Hi! I plan to make my old phone as a wifi booster. The only problem is that the USB "hole"/socket is borken. So I came up with a solution: I added + and - from a usb cable and then placed it on the phones battery. Should I worry if it touches the middle thing of the battery? I mean that thing between + and - . I think it won't if I place it carefully in the phone. I will connect the USB cable from my PC as I don't want to do it with strong power from the power point. So should I worry with the USB power from the pc if something goes wrong?. [b] Should I go with this or not?..[/b] I hope you understand I wrote this very fast, I can re-write if you don't understand thanks!.
Topic by Davve95 | last reply
I am wondering if its easily possible to convert a mp3 that runs on AAA to mains via a power pack, which we all seem to have plenty of laying around. i realise that the AAA battery is 1.5v or there abouts while the closest spare power pack i have is 4.0v dc / 350mA will it work, or is it possible to further step down so it would be suitable ? via electonics - or do i need to find a powerpack that matchs a AAA battery voltage. i was going to wire this to the battery terminals ... or am i just looking for trouble? lol
Question by agatornz | last reply
HI, I am an artist and I am creating a bike powered led sculpture for kids at a museum. I need some help making the connections correctly and finding the correct electric motor and volts not to over load the LED light bulbs as well as how to figure out the easiest gear ratio for kids to turn, There will be five 60 Watt /120 Volt LED bulbs connected to deep cycle car battery (used as a voltage regulator) that will be connected to a stationary bike pedaled by visitors to display the human energy potential. I want to figure out what type of electric motor I will need for those lights and how to make the gear ratio for the bike easy enough to turn for kids... Any knowledge on these calculations will help. Thank you ! Jessie
Question by real_jessie | last reply
I have a question about converting AC to DC using only two Diodes. I know you can have one transformer with a center tap and use two diodes. The question is, if I have two transformers connected in series to each othercan I do a center tap between the transformers and still use two diodes? The transformers both have the samevoltage out put. Thanks for any help
Question by tom1933 | last reply
I have a geocache project and need help with the power supply and power consumptin inside it. The basics of the project: It is a large wooden box. The box has a on/off switch. It also has various various coin slots. Flip the switch, turning it on, to supply power to the solenoid inside. Dropping a coin through the correct slot will trigger a momentary micro switch which activates the solenoid and springs out the drawer of treasures. Take your loot. Close the drawer. Turn off the switch and leave it for the next adventurer. And it works! Yay! Commoonents the question: The solenoid is a 12v door latch solenoid. https://www.adafruit.com/products/1512 The battery is a 12v 5ah sealed lead acid battery. The coin micro switch is: https://www.adafruit.com/products/820 My question. This geocache that lives, protected, about 3 blocks from my house. I obviously won't be charging the 12v battery very often. Since this setup only has momentary power draw once in a while. Say once a week. Maaaaaaybe. Does anyone have any alternate power recommendations? I am okay with changing out the batteries once in a while. But I'm hoping for a once every few months. I originally used a new lead acid battery but it seems to have died. Possibly from letting the charge fall to low and then sulfation occured. I'm considering using a 11.1V Lipo Rc battery instead so I can recharge it at various levels of depletion. Thing is I need it to last a worth while amount of time without loosing power but also killling the battery from just sitting there. Thoughs woukd be GREATLY appreciated. -McG
Question by McgCache | last reply
So here da ting. i got a little 6v power wheels quad at a yard sale for dirt cheap. i figured hey why not ill work on it a little and make it nice. long story short, i ended up with two 18v harbor freight batteries hanging on each back fender like military ammo cans and it looks awesome but now its a little too scary to let my son ride it. i would like to put a voltage regulator on it to turn it up or down depending on how well he can ride it and how safe i feel he can be. most of the ones i have found can barely handle 2 amps. where can i get a regulator to handle the load continuously. p.s. this is the last part i have to figure out before i can make a full instructable.
Question by snowfox222 | last reply
Summer days can be a bit too much in Southern California and my family uses a lot of electricity to keep the house cool. The problem is that one side of the breaker for the house is too heavy to handle all the appliances and electronics; because of it, the power trips a lot since people in my house apparently don't understand the whole "turn something off before you turn something on" concept. I considered running extension cords throughout the house but not only is it not practical but it can be a bit dangerous with the build up of friction from the ohms and what have you. I've been trying to think of ways to solve this issue and I was thinking maybe I could install a sensor switch or something of the sort that would not allow the use of certain appliances while others were on or maybe something that would turn something else off automatically in order for something else to be used. My biggest problem is I'm no graduate or electrician. I know a thing or two about the sort and am very capable of learning, I just need someone to point me in the right direction. I may not even be thinking in the right area which is why I'm posting. Any information would be greatly appreciated.
Topic by BnKSeth | last reply
There is a lot of conflicting information on this and I would like to know if my speakers/amp would get damaged. Using 80w speakers and a 50w amp will there be any problems with running on full volume? And if I got a 100w amp with those 80w speakers will there be damage, even if I added a heat sink to the back where the voice coil is? The speakers say 80w max but not really reliable as they are well priced Chinese speakers. Speakers: 80W Audio Sensitivity: 88dB Frequency Range (Hz): 100-20Khz 4 Ohm Amp: Efficiency: 90% Rated output power: 2*50W+100W Working voltage: DC18V to DC24V The maximum output current: 4A Frequency Response: 20Hz-20KHz Can drive a 3-16 ohm speakers In the condition of rated voltage 24V The sub woofer channel at rated voltage 24V state can drive 2-16 ohm sub woofer Bass cut-off frequency independent regulation 20HZ-20KHZ adjustable Very confusing conflicting info online with under rated amps causing clipping and over powered amps frying the speakers. Originally I thought it was only bad to over power the speakers. Any help about what is worse, is appreciated.
Question by bonze77 | last reply
I'm desperately trying to design an arduino circuit that can power each color of a high power cree MC-E color RGB led. What is the smallest dimension rechargeable battery I can use to accomplish this and have it run for a few hours? I'm desperate!
Question by SpiffyChee | last reply
I'm trying to build a power supply for some ws2812b leds ( 3 projects at nearly 300 leds Requireing 18 amp)The problem is that the only power supply large enough to handle them (5v 40 amp) has a 18v spike at the startup.Any ideas for a delay circuit that is 18v tolerant? Even having to push a button after the circuit is energized would work for me
Question by Wired_Mist | last reply
I have a cb radio my uncle gave me 12v 2-4 amps.. I have an old computer with a power supply with lines for 12v 6amps and 12v 8amps. is there anyway I can get this to power my cb radio without blowing the thing? EDIT I forgot to mention, this is a mobile cb radio, I'm trying to run it in the house, which is why I wan't to use a pc power supply to run it....
Topic by acer5050 | last reply