Leatherman: Surge or Wave?

Ok, so I want to buy a Leatherman. I have narrowed the choice down to the Surge or the Wave. The Surge has more tools, but you cannot have the file and the wood saw at the same time. The Wave has both. I am swaying towards the Wave at this moment, do any of you have Leathermans and would recommend a certain one?

Topic by knexguy 10 years ago  |  last reply 10 years ago


A surge in Cardboard I'bles?

Am I missing some sort of trend? What's with all the cardboard costumes? Has anyone else noticed them popping up every few hours? I think some could do with ... you know a splash of paint ... but well I was wondering... What's the trend? Am I missing something? Cheerio Biggsy

Topic by Biggsy 8 years ago  |  last reply 8 years ago



We DIDN'T get flooded!

You may be aware of a tidal surge in the North Sea in the last 24 hours - a three-metre high bulge of water headed down the East Coast of Britain, flooding stuff as it went.I live ten miles from the sea, but at midnight last night the police pushed a note through our door telling us to prepare to "defend life and property". Since they didn't supply sandbags, I was crawling around the house in the wee small hours duct-taping up air-bricks, door frames, the cat-flap etc, just in case. We moved the PC upstairs, and all our clothes and made a special effort to set my archos high-and-dry, since it contains our only irreplaceable possessions - about 25000 photos.The tide rose, towns flooded ( http://news.bbc.co.uk/1/hi/in_pictures/7086396.stm ), the local quay filled up and overflowed, but the flood never quite got to us.Ah well, all the excitement and none of the danger (except for crossing the bridge that was the only way out of the town I work in just as the river lapped against it). Colleagues from school got evacuated at 3am, and so many got cut off by the floods that we had to close school, so an extra day off for free.Has anybody else narrowly avoided being a news headline?

Topic by Kiteman 11 years ago  |  last reply 11 years ago


Microcontroller Timered Surge Protector

OK. So I have an indoor garden. A homemade Aeroponics setup for all kinds of lettuce, tomatoes even roses or other flowers for the girlfriend (dude this makes all of it worth it) but I want to be as clutter free as possible and well a gaggle of timers hooked to surge protectos is a hassle. I am looking to integrate a USB stick for the program into a microcontroller that will fit in one of those 8 outlet power bricks. There is quite a bit of unused room in these (almost enough for another row of 4 outlets). In Fact I have seen some of the 12 outlet models with the same overall size profile as the 8 that I have. It is just a regular old belkin entertainment center surge protector but I have a box full of various surge protectors etc. I even have an old backup UPS with a shot battery that I could use that housing but I would prefer a slimmer profile. I want to also use these to control the entertainment area kind of like a smart Kill-A-Watt. Maybe even the computers too. Each outlet could be individually controlled as well as master shutoffs. If you wanted to get really creative you could even set power usage limits for each plug or other Then you would just need a small desktop application to plug all the parameters into. This would by far be the most tedious depending on what microcontroller you use. I am always popping up with these ideas but I lack the expertise in several areas to develop something like this on my own. But I am pretty good at following directions.

Topic by stusatwork 10 years ago  |  last reply 10 years ago


Best protection for computer... LIGHTNING

I've heard of computers fried in electrical storms, even with a surge protector. 1) Is there a better way to protect it, short of unplugging? a friend mentioned connecting it thru a bus, and letting the bus act as a fuse. I'm not sure what he was really getting at. 2) What are the odds? 3) experiences + anecdotes?

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


Power Surge Fried my Integrated Network Card?

At least, it seems this way. I while ago we had a weird "power surge like thing". It was odd... It seemed to "restart" some electronics...I was on my computer when It happened, it was like a really close lightning bolt. Though after it scared the crap out of me and I looked at my screen, the computer was still on and everything was running. Then windows started to act like I had just unplugged everything and plugged them back in. It started to read my flashdrive, my printer turned back on and announced the black ink was low (stupid $35+ ink :P), etc. Since it was going nowhere I just held the power button and shut er off. Then, later, after turning it all back on I found that it didn't have an internet connection. I finally got one after unplugging my router (Which I could still get a connection through the wifi) and connecting my modem to my comp through usb instead. I think it fried my NIC. ...crap Think that's what happened, and I'll have to buy a pci adapter instead? Thanks,RX --This is odd too. I went upstairs and my PSP, and Zune were both turned on. Neither were plugged in and both were completely off....and now it seems my tv is blown out.

Topic by Rockerx 9 years ago


How to Repair Air Purifier Damaged by Power Surge?

Does anyone know how to repair an air purifier that has been damaged by a power surge?  I have several Cleanaire D2000 units - which are absolutely outstanding, BUT which have a weakness of being particularly susceptible to power surges.  Since they cost $400 apiece, it makes for a pretty costly power surge.  Are these kind of things repairable, and if so, where would I (or my technically-gifted friend) start?   I'd like to see if it's possible to repair one of these before going out and buying a replacement.  (Then the next step is to buy a good surge protector!) Thanks!

Question by Thaas12 4 years ago  |  last reply 4 years ago


Surge in contests creating more / better instructables?

Is it me, or does it seem that the recent surge in contests strongly correlates with the number and quality of instructables submitted? I feel so inferior, but happy to see such great projects being posted. I really am impressed.

Topic by mikesty 11 years ago  |  last reply 11 years ago


1992 Mitsubishi eclipse odd power surges?

I have a 1992 Mitsubishi eclipse that has odd power surges.  It is sluggish about 90% of the time and then it has random boosts where I leave about 4 yards of rubber on the road.  I was wondering if anybody has any ideas on how to fix this.  i intend to give thew car to my girlfriend but i have a bit more experience on junky cars than she dose and i don't want her spinning here tires in the snow due to the boosts in power.  

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


USB devices on my PC cause 'Power surge'? Answered

I have Microsoft Windows XP sp2 running on a dell machine. Whenever I plug my camera in to get pictures off of it, the keyboard and/or mouse stop functioning and i receive an alert that says "power surge on hub port" or something similar. In order to get my keyboard and/or mouse to work again, i have to unplug my camera from the USB port and reset all ports. This just started happening today, even after I restarted. The error message in the picture below keeps coming up and closing itself in some kind of loop as I type this... Why does my camera cause other USB devices to malfunction when I plug it in the? Why does that error keep popping up every half a second? And, on top of all this, my tooth is throbbing for no apparent reason :( Help! -Nepheron

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


Voltage Stabilizer Efficiency Loss (Extra power consumption)

Hello All, I am using an 1KVA Voltage stabilizer for my Fridge. The power quality is really poor here in India, and these things are mandatory. I learnt the lesson hard way :-(.... Well that aside, i would like to know what would be the power loss or Extra consumption these devices use when regulating power. Actually,i could use a general lecture on how Stabilizers work!

Topic by bhvm 6 years ago  |  last reply 6 years ago


Electronic repair after a voltage spike or power surge

So far I was lucky and never got a lightning strike or other power failure to induce high voltages into my house and equippment. But over the time I got several requests from friends to take a look at things after literally all connected electronics in their house got fried. In some cases there is only a total write off as due to a lack of surge protectors inside all unwanted juice made it's way into vital components. Like a brand new Samsung TV where the replacement of the power board was the only option - which makes you wonder... But in other cases, like microwaves, induction cooktops, computers and such I had some good success with the repairs. Guess it comes down to purs luck on both sides, power surge was not too bad and simple components on the input side failed quickly enough to prevent damage to microprocessors or other sensitive parts. Right now I have an induction cooktop here again that failed after a mains transformer in street blew up during a thunderstorm. I can tell it was bad as everything in the area of fried parts has a vaporizsed metal film on the surface and not much is left that was a surge protection. I cleaned all up, replaced the varistors and missing parts of the traces on the circuit board but the cooktop is not performing the way it should anymore :( At some stage during cooking it turns off with a meaningless error code stating the input voltage was out of bounds. So my next attempt was to literally remove every single component from the filter and power supply board to measure for any possible connections between the traces. By doing so I noticed several points where I had a quite high but measurable resistance in areas where there should be none. Mostly on the direct input side where the varistors tried to save things. So I used my Dremel in a tin drill press to cut the circuit board aourd the affect areas (where possible with a drill, otherwise with a thin grinding disk).. Sure enough I was greeted by charcoal colored dust in several areas. After removing all material until the dust was "clean"  tried again and this time all seems to work fine. I would like to use this topic to offer some help and guidance in case you have devices that suffered a severe power surge of some sort. Many of us either have no insurance to replace those items or even if you do the device might be expensive enough to try a repair despite getting it replaced. Trust me, even it went up in smoke there is still a chance to fix it in some cases and if proper protective circuits were in place the repair could as cheap as a few Dollars for replacement parts. To get useful advice the following things should be included in your request: Some clear pictures showing a close up of the affected parts - if there is visibale damage to be seen. A brief description of what happened, e.g.: lightning strike directly into the house or outside power lines, generator or inverter failure or simply that the power company stuffed up and your entire street was affected. Of course you will need the means to take the device apart for investigation and also some basic soldering skills or somehow how has and can assist you. But if you are up to the challange I am willing to help if possible.

Topic by Downunder35m 2 years ago  |  last reply 6 months ago


im interested in a whole house power conditioner and surge protection system, any ideas?

I have a new house, 2900 sqft. 3 breaker panels im looking for something i can put inline at the primary panel that will stop surges and keep my power at a solid 110v.

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


How to fix computer that won't turn on after power surge?

Recently we had some heavy rain and I had a few things blow out, including router, modem, desktop, and a few other things. But the question here is regarding the desktop that will not turn on after this storm and apparent power surge.  When I hit the power button, nothing happens. I bought a new power supply and it turns on again with only one problem. All the colors on my monitor display are very washed out and faded. I plugged the monitor into another working computer and it works fine so I know the problem isn't the monitor. The power supply unit that I purchased isn't exactly the same as the original since the original is a little old and hard to come by. So my question is what can I do to get my computer working like it used to be? The operating system is Windows Vista Home Premium and it is a Dell Studio XPS desktop. What do I need to replace to get my display working properly? If anyone can help me answer this it is much appreciated.

Question by Science102 2 years ago  |  last reply 2 years ago


Can you put SCR's in parallel? Answered

The title said it all. The reason I want to do it is because I want to discharge a capacitor bank into a coilgun, etc, using SCR instead of a large switch. The surge current form the capacitor bank is approximately 400 amps and the SCR's I have can handle surge current of 160 amps, can I put a few of those in parallel to handle 400 amps?

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


An illuminated light switch that will work on 120/240V AC.

I have a fluorescent light fixture that my dad gave me, it was about 9 feet, so I cut it in half and re-did the wiring so it would fit on my workbench. It uses a plug to turn on and off. I know the wall switches they sell at home depot are rated for 120/240v but they are cheesy looking and hard to locate in the middle of the night in my garage. When I come home from work on my motorcycle, I need an immediate source of light. Is it possible to use an illuminated switch, say from, Oreilly's or Advanced Auto parts and add some form of surge protection so it won't blow or pop a breaker? I want to use the same concept as a surge protector, it uses an illuminated switch, but only cause its components are protected by the surge. Is it possible to make my own involving soldering components on PCB?

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


Flash drive problems

EDIT: I found a flash drive, and it doesn't work. I plugged it into my computer, nothing. I plugged it into a laptop, and it said that there was a power surge in the usb device. Any ideas?

Topic by Aar000n3y 11 years ago  |  last reply 8 years ago


Small motor overheat

On HVAC evap fan motor at 120 Vac no load motor overheat then feedback pulse stop working 5178 pulses / min divided by 4 = 1294.5 rpm shall turn at 1350 + - 20 rpm what make the motor to overheat ? the unit had a power surge when lightning can it be saved ?

Question by jma123 7 years ago  |  last reply 7 years ago


Why has my site suddenly had hundreds of visits? Answered

I'll show you the graph. It is my site to do with stylophone tabs. My overall views are 1,352, last month I had 805? Is there a good reason for this? Or is is just a sudden public surge for stylophone tabs? Thansk, Flannel UK

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


Self-balancing motor sizing and drivers?

I'm starting to plan a self-balancing unicycle and I notice several people that have built them are using 450-500W motors. I'd like to use something a bit more robust, like 750W @ 24v, due to terrain. I'm wondering if that's too much and if the guys that are using 500W are happy with the results? Has anybody tracked their current (amps) usage? My guess is that unless you're going full speed and uphill you'll rarely hit full wattage on your motor except for temporary instances. One of the challenges I'm finding is that there are motor drivers up to 25A at 24v or 36v that can handle a bit of surge, but then it takes a huge leap to 160A and 400A surge. I don't think I need something that large and expensive, but my electric motor experience is limited. Could some of you more experienced guys chime in with a bit of advice? Thanks, Gyv

Topic by Gyvven 6 years ago


My Hp compaq laptop has too many problems.

My hp compaq nc6220 is annoying me. It began to say power surge on hub port. I then began to freeze until i press on the keyboard area.It now doesn;t start up. I was thinking the problem was on the hard drive. Now i believe it is internal

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


Wifi Router to Wifi Router Comms? Answered

Hi all, i have my Main Wifi router Netgear Wndr4500 and i want to use it to talk to my old Dlink 2730b so i can use the LAN ports on the Dlink. PayTvBox > DLINK ----Netgear-->internet i can't use Powerline Ethernet because the surge boards muck with it.

Question by furby 5 years ago  |  last reply 5 years ago


Lidocaine!!! you get high and fall asleep for surgery!

I recently had surgery for mole removal, and i'm under 16, so they had to put me out.first they injected me with lidocaine, and i got all high then fell asleep, then they put on the gas to keep me asleep.it's crazy!!!!!!!!!what about your surgeries?

Topic by AnarchistAsian 10 years ago  |  last reply 10 years ago


How to Save Electricity

Saving Electricity: How to Save Electricity Welcome!I've always hated "How-To" guides which don't explain why a certain tip works, or how well it works. Sometimes a topic is just as mysterious after you read the guide.My guide is different.In all honesty, this guide is a bit simplistic, but it does have a nice description of why there's no point to worrying about surges when electronic devices are powered up.

Topic by ewilhelm 11 years ago  |  last reply 10 years ago


RCA Rear Projection TV worked, took apart, put back together, doesnt work?

I have a RCA HD52w56 rear projection tv that was working fine and the coaxial input was broken off. I took off the back and soldered a new coax input.  However I think I mixed up the wires. Now, the tv does the old turn on blink green and turn off, no picture. In fact, one time I just plugged it into surge protector, never pressed the power button, and didnt even have the coax connected and the same instant the power in another room in the house when out but the surge protector the tv was plugged into stayed on. weird   Does anyone have a schematic diagram so I can check if I hooked something up wrong? Not Manual(preferably free, college kid w no money) Did I blow something? Everything was working before the coax got pulled out Thanks for looking and any advice is greatly appreciated.

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


Using a Rhino FXS Analog Chanel bank to actuate a relay

Ok so i've got a VOIP system that's connected to a Rhino FXS Chanel bank  that's used to control our overhead paging system. From the Rhino we go to a Volcom analog adapter to a Volcom Stacker unit (echo cancelation). Every once in a while this system will "lock up" and just throw static over the paging system (and even more rarely someone will put the overhead paging system on hold which pumps our hold music over the intercom system)...to combat this i've got the Rhino, the adapter, and the stacker pluged into a surge protector so that when the "abnormal condition occurs" we just flip the switch on the surge protector and it drops the whole system. then we turn it back on and all is well.This works great but the system is in a remote location in the facility so it takes a bit of walking to get to it. What i'd like to do is try to hook up a NC relay between the surge protector and the wall and have an open channel on the Rhino actuate the relay to basically turn the power off to the system any time you dial a specific extension.According to the datasheet the Rhino itself has a line current limit from 18ma to 45ma and it emits standard telephone line voltage....i can also configure the ring cadence...so i can probably set the ring duration long enough to actuate the relay before it cuts the system off (which would then return the relay back to closed)i'm having trouble finding out what the actual output voltage on the analog line and a general lack of schematics to try to make this workso...if anyone wants to have a little fun attempting to design a relay that can be actuated by a telephone...please reply

Topic by crapflinger 9 years ago  |  last reply 6 years ago


Convert 320VDC to 230VAC or 48VDC voltage using 230VAC (UK) UPS?

I've got access to 12 flexible Solar Panels - 320VDC each I live in the UK where mains voltage is 230VAC and also might buy an electric engine which would run at 48VDC. Would a UK voltage (230VAC) UPS be able to step down the 320VDC to either 230VAC or 48VDC for use on a boat? I'm thinking I could connect 12 panels in parallel and use either; Double-conversion UPS to deliver 48V by bypassing the conversion from the battery back to 230V or  Line-interactive UPS to deliver 230V directly from the 320VDC. The question is would the UPS's surge protection be able to deal with the high voltages? (Keeping in mind the sun isn't real bright in the UK). Also with regard efficiency will there be a lot of power loss in the system? I don't really know how surge protection from overvoltage works in UPS's and assume it uses some kind of buck conversion...? I'm guessing that the surge protection circuits might struggle with continued voltage overload. Does anyone know if this would be the case? The question is, will the UPS's be able to reliably deliver either 230VAC or 48VDC? Here are the specs for each individual panel; http://www.innoasia.net/2010/pdf/presentation/SmartCity_Takano.pdf Open circuit voltage(Voc): 429V Optimum power voltage(VMP):319 V Short circuit current(Isc): 0.39A Max operating current(IMP): 0.288A torrence:+_5% Maximum system voltage: 1000V THERMAL CHARACTERISTICS: (-25 ° C to +90 ° C) Temperature coefficient É‘Isc +0.08%/ ° C Temperature coefficient É‘Voc -0.35%/ ° C. Temperature coefficient É‘Pmax -0.15% / ° C. Over-current Protection 30mA

Question by mchin2 5 years ago  |  last reply 2 years ago


LED indicator

How should I drive an LED from a 38 volts power supply? The led wizard says I need a 1800 ohm, 2 watt resistor, but it also says' it'll disipate excessive heat. I recently took apart a surge protector and found that they drive an LED from a 120volt source by having a diode, LED and what appears to be either a 1 or 2 watt resistor. I need help driving an LED from a 38 volts power supply just as an indicator.

Topic by guyfrom7up 11 years ago  |  last reply 11 years ago


How do I Make My Character Look Older?

I have a character that I use for everything named Dark Surge, and a part of his backstory is that he's 35 developmentally (literally, he's 40,000,001), but he looks like an adolescent.  I'm not sure how I can make him older.  Any tips?  Thank you! (These are his two side views; I am animating him, and so the two views are used as separate characters for simplicity.)

Question by StarscreamClone 5 years ago  |  last reply 5 years ago


power inverter: help? Answered

I have this power inrter, and i once hooked it up t a mac power supply converted to a benchtop power supply. i didn't know i yet, but the power supply was surging, and it started making he inverter smoke. i turned it off, but the inerter never worked again. can i reuse any of these parts to make a new one? i dont think it was the actual inverter piece, but one of the others p.s. this inverter was from a hp scanjet scanner

Question by zack247 8 years ago  |  last reply 8 years ago


Sometimes I accidently 'flip' On-Off-On the power switch of my TFT LCD, could this cause any harm to the LCD's circuits? Answered

Or the appliance has some protection against this? (my worry is that such on-off flipping cause some surge or arch). It's said that in modern PC LCD monitors like mine (where the power switch is just a touch sensitive area of the front bevel) most of the actual circuitry remains on all the time so I have nothing to worry about, is that correct?

Question by allymcbeal 9 years ago  |  last reply 8 years ago


Just read Aeshir's b***h-fest, I can top that

Lightning hit my tree, everything that is wireless and powered in my house got knocked out permanently, this includes: flat panel tv, 2 CRT tv, nintendo wii, wiimotes, every cordless phone, every clock radio, and my cheapo routereverything that was unplugged and without batteries in them was fine, also things that are not wireless are fine, there was no surge or anythingI don't know how badly it affected my neighbors and finally, some picshttp://s156.photobucket.com/albums/t31/frank26080115/Lightning%20Strike/?action=view&slideshow;=true

Topic by frank26080115 11 years ago  |  last reply 11 years ago


What is the output current (limit) of a typical USB car charger???? Answered

I need to power 2 hard disks in the field. Power requirement: 900 mA each. For the 5V connection, I want to convert the 12V power input with one or more car USB chargers. I need to know if one or more chargers in parallel (how many??) are needed. I have sufficient 12 V juice (small lead acid battery). Additional: for surges in power consumption, do I need to add a capacitor? What would be the rating? Do I have to wire it in series or across? (Sorry I'm a layman in electronics...)

Question by BobS 9 years ago  |  last reply 2 years ago


Need a protection circuit?

Hi i am making my own speaker system. i am using this amp http://www.dealextreme.com/p/y148-audio-amplifier-module-93121 the issue im facing is that a few days ago i power this amp with a smps 12v 1amp supply and it was working fine till something went wrong with the psu and there was a spark in the psu, the major problem which occurred  was that this caused a surge which travelled through the amp to my audio source which in this case was my computer. i ended up frying my sound card . can anyone help me make some kind of protection circuit which allows audio signals to pass through but does not let current from the psu pass through.

Question by cfrek 6 years ago  |  last reply 6 years ago


adjustable power supply question? Using a LM338?

so I'm building a power supply that will have multi power outputs, from surge protected 120,  36v 10a 24v 2.5a,  12v 3a  9v 1a, 12v 1a,  5v usb, and 12v cigarette lighter output. there is also an adjustable 1.25 to 32v  5 amp, the problem i'm having is no mater what set up I try, I never get more than 1.8 amps out of the LM338, I have an input of 36v 10a, I've tried several diagram , can anyone point me to a diagram that will actually allow a full 5amps to be pulled? I have the LM338 on a huge heat sink. 

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


High Voltage Ground

I'm starting to work with high voltages again, but for real this time. I just built an ignition coil driver, using a 555 (and I got an ignition coil), but my 555 broke (the texas instruments ones can only drive 15mA, oppose to the normal 200mA, oops) so I have to go buy one today. My main question is what to use for ground, whether it be for an old screwdriver for arcing sparks or the secondary of a tesla coil. I was originall just going to use the 3rd prong of an outlet, but somewhere on the internet I heard this could destroy all surge protected power strips and destroy all plugged in electronics at your house. I, of course, do not want this cause... well... I'd be screwed. Is this true or not? Can I use the 3rd prong?

Topic by guyfrom7up 10 years ago  |  last reply 10 years ago


Oil Rag/Red Rag Ideas? Other uses?

Long story short, i recently came in to a pile of clean rags that mechanics use to wipe oil from their hands and tools. I posted a link below to reference this item if anyone is not familiar.  I dont have any use for these rags but the simple cloth squares have been surged and would do well as a handkerchief (Cloth tissue or napkin) is they weren't so rough. I want to open up the topic to everyone and see if anyone has ideas for alternative uses.. i made a small pouch from one already but other then that i haven't got any more ideas. Sorry, not trying to promote this store but these are the rags i have now. http://ragdepot.net/1000-red-shop-.html

Topic by Exhumer 8 years ago  |  last reply 8 years ago


Where do the leads of a zener diode connect to in a DC system? Answered

I have a light in my car that takes two incandescent type light bulbs, but when I use both sockets, the bulbs are broken open and some of the glass is melted in a couple weeks. I've bought plug and play LED lights that have multiple LEDs (with a resistor on both the cathode and anode) and just plug into the sockets, and I used both sockets, they lasted about two months. And since I had only one spare bulb in my center console, I plugged it in, and its been working for over a year (this is where I found out that using both sockets made the lights fail). I'm guessing that the when the engine starts, it sends a surge to the light. So I decided, that I'll just make my own light using LEDs, I have everything resistors LEDs and wire, but I'm unsure where to connect a zener diode/s to the LED array (or if a zener diode would even protect the array). I've looked on the net, but some say to solder inline and some say it needs to connect to the ground, and I cant tell which is right for my case. I've included the output of the LED calculator and the specs. below.     Source:                     12V     Diode Forward:       1.8     Diode Amps.:          20mA     Number in Series: 24    Solution 0: 6 x 4 array uses 24 LEDs exactly +----|>|----|>|----|>|----|>|----|>|----|>|---///----+ R = 68 ohms +----|>|----|>|----|>|----|>|----|>|----|>|---///----+ R = 68 ohms +----|>|----|>|----|>|----|>|----|>|----|>|---///----+ R = 68 ohms +----|>|----|>|----|>|----|>|----|>|----|>|---///----+ R = 68 ohms The wizard says: In solution 0: *each 68 ohm resistor dissipates 27.2 mW *the wizard thinks ¼W resistors are fine for your application *together, all resistors dissipate 108.8 mW together, *the diodes dissipate 864 mW total power dissipated by the array is 972.8 mW *the array draws current of 80 mA from the source.

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


Power strip measures energy use, costs much more than separate power strip and monitor

Again, anyone want to collaborate to make our own? This thing Cut down on energy costs and reduce your electric bill. Simply plug the easy-to-use Power Cost Controller with surge protection into the wall and connect your electronics to the power strip to see how efficient it really is. Large LCD display will count consumption and cost by the kilowatt-hour, same as your local utility. Monitor your electric consumption by hour, day, week, month, even an entire year. Also check the quality of your power by monitoring voltage, line frequency, and power factor. Measures 8-1800W appliances. Now you'll know how much your computer network or home media center really costs! Replaceable 1.5V battery included.

Topic by laminterious 10 years ago  |  last reply 10 years ago


Dell computer question?- not turning on

I have a Dell dimension 2400 that while using it turned off and never powered back on. It was raining that day and I was on the computer and I heard what it sounded like a spark and I kinda saw it too behind where the computer case is(light was off so I saw like a small spark on the wall). I have the computer on a protected surge power strip. This happend before a month before and it was fixed with a new power supply. It didn't turn on also the next morning and it was raining also in the night. I'm thinking a voltage spike cause it .So this time I put in a new power supply and it wont turn on. The power supplys both work(new and older one). So what could it be that is causing it not to turn on? Anyone ever had this problem before? There is a green LED inside that turns on when pluged in but thats it. The power buttons LEDs don't turn on when pushed to power on.

Question by PitStoP 10 years ago  |  last reply 8 years ago


Windows COA code Answered

Hello. My desktop computer`s hard drive corrupted a while ago due to a power surge and rendered it unusable. After consulting a computer savy friend he said I would need a new hard drive. I have finally began to repair it, I have bought a new hardrive and was wondering can I use my original COA code from windows XP to clean install Windows 7? The reason I ask is that windows 7 is very expensive from new, however you can get the offical disks with supposedly working COA codes for half the price on ebay. They say they are from de-activated computers however I am worried I will buy one and the code will already be in use or invalid. So as a backup would my original code work or would it say it is still in use? (P.s I am not interested in getting windows 8 or 8.1, I cannot afford it) Thankyou :)

Question by Boba Jett 3 years ago  |  last reply 3 years ago


Joule Thief. I know how they work, but is a joule thief self-regulating and self-limiting? Is a varying input (DC) okay?

Joule Thieves. I know how they work (my one works fine) , but is a joule thief self-regulating and self-limiting? Could I hook it up to a 12V source? Is a varying input voltage okay? -- Will the voltage/current across my white LED (should be 2.6VDC absolute max) be too high or surge? I would like to know if it would be suitable to use on my motorcycle to drive an additional LED or two for a headlight supplement. The voltage varies between 11.5VDC and 18.2VDC. I have a basic handmade circuit, with a hand-wound toroid and a generic transistor, usually running from a stable 1.1 to 1.6VDC, I have tried it with a 9V cell and it seems to work alright, but I want to be sure before modifying it/or my motorbike. Any help much appreciated! 8-)

Question by xerxesx20 9 years ago  |  last reply 9 years ago


LED Lamp Buzzing (not a bulb)

About a year ago, I came across this LED lamp that was on sale at my local Target store. It caught my eye because it had a little tray at the base of the lamp along with a USB port for charging my devices. Since the first time I plugged it in and turned it on, it makes a buzzing noise. At first it didn't bother me, but now that I am spending more time at my workbench it has become annoying. I understand it is kind of common for LED bulbs to do this because of the dimmer switch being outdated, however this lamp is not dimmable nor is it a "bulb" so to say. It's about 7-9 SMD LEDs on a circuit with a rocker switch. If it makes a difference, I do have my lamp plugged into a surge protector and don't have anything plugged into the USB port located at the base of the lamp. What can be done (other than throwing it away, of course) to stop the buzzing noise coming from the lamp? Thanks in advance!

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


Transistor get's really hot and doesn't seem to work. Answered

I'm trying to turn on and off a 12V dc motor/pump (it's one of the motors that squirts the water on your windshield to clean it). Just hooked directly up to the power supply it draws about 1.5A. When I turn on the switch, my transistor gets super hot, to the point I can smell it burning, and the motor does NOT turn on. It's an IRF510 transistor. I copied this circuit from a YouTube video (https://www.youtube.com/watch?v=-g0Q0e1mhIY&feature;=iv&src;_vid=nYjhYKeOOgI&annotation;_id=annotation_856844) and this guy seems to have gotten his version to work fine. I cannot figure out what's going on here. The wires in my picture that go off the table are connected to a 13V power supply on the ground. The diode attached to the motor is a 6A rectifier to handle the emf surge from turning the motor off. Let me know if you have any questions for me! IRF510 Datasheet: http://www.kitsandparts.com/IRF510.pdf

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


Less then 2 yr old flat screen - has died....I believe...

My 17" Gateway flatscreen went blank this morning while I was at meeting. My wife claims she didn't do anything.....that it was blank when she saw it. It was not in sleep mode, nor was a screen saver on. I noticed the "power button" which is normally green (power up, with computer signal) or amber (powered up w/out signal), would not come on. I attempted to see if any of the adjustments on the side might have been bumped, no effect. I tested to make sure there was power from the surge protector (switched power outlets after a shut down) to no avail. After my 4th reboot, I subbed in my old monster sized 17" CRT tube monitor, and it works fine. Resolution is different, but it works.....but that pushed the monitor about 2 feet closer to my nose then I would like (it is about 10 inches from my face. )Did I miss anything as far as testing the monitor before replacing it? I personally think the PSU in the monitor went on the fritz, but I am open to suggestions. EDIT: The old CRT is now back ni it's storage area, and the newest LCD screen is up and running.

Topic by Goodhart 10 years ago  |  last reply 10 years ago


Looking for help making a simple on/delay/off circuit.I? Answered

I am looking for help making a ( hopefully simple ) circuit to drive an electronic relief valve. What I have is a push button on a linkage and an electronically actuated valve. I'd like a circuit that, when the button is pressed, will supply a 12v output for roughly 500ms immediately after the button is pressed, which will then turn off. The circuit must then remain off while the button remains held, until it is released and hit again.  Linkage open / Valve closed > Linkage closed / Button pressed > Valve open 500ms > Valve closed / linkage remains closed > Repeat The system is for a turbocharged diesel engine. When the throttle is snapped shut, the boost pressure has nowhere to go. It tries to run back out the compressor housing. This results in a forceful drop in turbine RPM, and in extreme cases even completely stalling the turbine ( and blowing it to pieces ) I intend to vent this pressure back pre-turbo via a 2 inch valve. The short delay upon closing the throttle with this size of valve should be more than adequate. I also intend on wiring a boost pressure switch to disengage this circuit below 15psi. The turbo's anti-surge housing is effective at the lower pressure. Any help with the circuit would be GREATLY appreciated! 

Question by jacob5680 6 years ago  |  last reply 6 years ago


Foam Cutter transformer...overkill?

I have a Pyramid ps9kx desk top power supply for running 12v stuff...can I use this directly as a foam cutter or is this more of a breaker throwing foam melter? Specs from Amazon;5 Amp Hobbyist Bench Power SupplyBench Power Supply, AC-to-DC Power Converter with Car/Vehicle Power Outlet (5 Amp) Features:Linear / Regulated Power Supply DesignAC-to-DC Power Conversion (12V DC)Provides Constant Source of DC VoltageSimple Electronic Plug-in OperationHassle-Free Screw Terminal ConnectorsEliminates the Need of Battery or External Power Source12V Car / Vehicle Cigarette Lighter Power Accessory Outlet ConnectorFuse Protected with Auto-ResetElectronic Overload, Short Circuit & Overload ProtectionUsed for Component & Device Equipment Testing, Operation & PerformanceRugged & Durable Housing Construction, Cabinet HeatsinkBuilt-in Cooling FanPower ON / OFF SwitchPyramid Compact Hobby Power Supplies Safe for Tabletop PlacementTechnical Specs:Amperage: 5.0 AMP (Constant), 7.0 AMP (Surge)Connectors / Hardwire Terminals: Red Positive (+), Black Negative (-)Power Output: 13.8V DCPower Input: 115V AC, 60Hz (70 Watt)Dimensions (L x W x H): 7.5'' x 4.9'' x 3.0'' -incheshttps://www.amazon.com/Pyramid-Supply-Converter-Vehicle-PS9KX/dp/B0002BA570

Question by Nightmare54 1 year ago  |  last reply 1 year ago


Series Hybrid Motorized Bike

I am designing a system to motorize my bike, but I really don't have enough money for it. I have been thinking I would like to use this engine for quite a while, because it's cheap, light, and OHC. There is a centrifugal clutch for it, but it costs $85, so I've been trying to design a series hybrid system instead. Considering that these motors cost only $6, it seems perfectly feasible to make something cheaper this way, but there are ways I can think of to possibly make it even cheaper. Here comes the technical part: my original design has two of the motors hooked up to the engine at double speed as generators, making 12v. Then there would be two more of these motors traction-driving the rear wheel. The problem with this is that the gear reduction is expensive. My new design has the engine directly driving only one generator, making only 6v so that I would have to have as many as 8 motors driving the wheel (opportunity for AWD?) to pull enough current to get full power out of the engine. Here's the problem: I don't know if the generator will be able to handle that current draw. Considering it would only have to do it for a couple seconds, do you think that one of these motors (working as a generator) could handle 400 amps surge? Other information: this will not see much low-speed operation. Geared to top out at about 25mph, it will probably spend most of it's time going 10-20.

Topic by yourcat 10 years ago  |  last reply 10 years ago


Which soda is the best?

I suddenly got this idea to post a topic in which soda is the best. If this topic has already been posted, please notify me so that I can remove it. Votes will be closed at October 15. The winning soda will be announced after I count all the votes (either the 15th or 16th), and whoever voted for the winning soda gets the good feeling of being better than everyone else. Capiche? (8.12.08) EDIT: Wow. I never thought this would become so popular in about... 5 days. Thanks for voting, everyone! RULES: 1. You may vote for up to three DIFFERENT sodas, once each time. 2. You may not vote more than once. 3. You may not start a conversation with someone on this forum that has absolutely nothing to do with the topic. 4. There is no #4. 5. Your choices are: Anything you like that's a soda. Remember to keep your votes to up to 3 different sodas. Nothing alcoholic, please. EDIT (8.13.08, somewhere around 12 PM Central Time) The results so far. In first: Coke with 5 votes. In second: Jones with 4 votes. And the sodas tied for third: Root Beer, Cream Soda, and Dr. Pepper, each with 3 votes. Sodas with 2 votes: Mountain Dew, Diet Coke. Pepsi, and Canada Dry. Sodas with 1 vote: SURGE!!!!!!, Virgin Cuba Libre, Sprite, Sprite Remix (-_-;;), Vanilla Coke, Sunkist, Cherry Coke, Fresca, Limca, and 7-Up. Thanks again for voting, everyone!

Topic by RokuXIII 10 years ago  |  last reply 5 years ago