single lead capacitor

How can i make a single lead capacitor for this

Posted by taterkiller 8 years ago

how do a 1.5v battary charge 330v capacitor in a disposable camera?

I got a capacitor from my disposable camera but it was damaged so i buy a 330v 120uf capacitor but i cant charge it on my 1.5v battary i wont to know how do a 1.5v battary charge 330v capacitor in a disposable camera

Posted by omartech 5 years ago

uF difference interchange capacitor question

Hello everyone! I got a microwave, Sharp R21LCF with a bad capacitor. A friend of mine used to have the same Sharp microwave, but older model, R21JCA. When his R21JCA broken and could not be repaired; he took out the parts that still work and save them. So he has a spare capacitor. I compare both capacitors and found his good capacitor has a 2400VAC with .94 uF comparing to my bad capacitor, which has 2300 VAC with 1.00 uF. I understand that you can replace the capacitor with a higher voltage rating, but not sure if .6 uF difference would be ok for replacement? May i ask for your expertise opinion/input? Thank you very much for yr time! attached are the two links for those capacitor I am asking about. Bad capacitor from R21LCF Good capacitor that we want to use from R21JCA

Posted by didadee 5 years ago

capacitor control

I was just wondering if anyone knows any methods of controlling the energy discharge from a capacitor..

Posted by nuncoop 11 years ago

capacitor based battery replacement

I was wandering how big does a normal capacitor have to be to replace a AAA battery?

Posted by clasic_traveller_diehard 10 years ago

Recently aquired a BIG capacitor

I need some ideas to use this capacitor for. the ratings are 120,000 MFD @ 25 VDC Thank you.

Posted by newwarhammer2 7 years ago

Capacitor Pin Extention

Good day everyone, I am sitting with a issue of changing a capacitor on a board but the factory default pins are to short to reach their holes. Is there a way to make them longer other then needing to get another new capacitor? I am using a 450V 150uf(M) capacitor. 

Posted by ChristopherC297 1 year ago

capacitor resistance

Why is it that as super capacitors capacitance goes up the internal resistance goes down? I'm looking for a tiny capacitor that can supply 0.3 volts20mA (I'm going to be powering flexinol, not an LED) for 1 second. I don't want the capacitor to be huge because I'm making a beam bot where size is a factor for charging time and because of it's physical size.

Posted by guyfrom7up 10 years ago

Explosive Fun with a Capacitor Bank

Watch a 24kj capacitor bank as it discharges through various objects. Maniacal laughter follows each one and a slo-mo montage finishes it all up. via Make blog

Posted by fungus amungus 10 years ago

What can I do with 49 47uF Capacitors?

I needed a 47uF 35v capacitor for a project and ened up buying 50 of them for like a dollar. I don't know what to do with them.

Posted by Clayton H. 8 years ago

Build a capacitor (proper dielectric)

Hi there, I need dielectric with very high "Dielectric Strength" (a few 10s or 100s of kilo volts per mm) and also high "Dielectric Constant". Can anyone suggest me one? I would like to build a compact capacitor with high capacity and I need advice how to do it. I would be happy if someone can help me and for that purpose I will describe what I need: - The capacitor must be "Parallel Plate Capacitor". - The capacitor must be very thin with small distance between the two plates. - The dielectric must have very high "Dielectric Strength" (a few 10s or 100s of kilo volts per mm) and also high "Dielectric Constant". - The capacitor will be connected to a DC current circuit which purpose is to charge the capacitor and to keep its charge sustainable in time. - The capacity of the capacitor must be a few micro Farads. Taking into account the above, there a few important questions (correct me if I am wrong): - What dielectric to use and where can I buy it? - Is the building of such capacitor achievable in home environment or there are manufacturers who can do it for me? - Is there anything important for the building of the capacitor which I have missed to mention? Thanks a lot! ;)

Posted by paveltashev 2 years ago

What kind of capacitor is that?

So I've been trying to make a simple radio circuit based off of this schematic ( , but I don't know the type of capacitor that's labeled "C4, 220uF/ 25V" and looks like ---l]--- I tried searching for the types of capacitors on Google, but I cant get anything more specific than "polarized". Could anyone please drop some knowledge on what that is?

Posted by Actan 3 years ago

Need advice and help for capacitor circuit design

Hi all Instructables friends,       I have been viewing instructables for quite some time and I like it very much, thanks to all the contributor here, I really learn a lot. This is my first post here, and I only have basic electronic ideas, never soldier or build any circuit, so please be patient if I made any stupid things :) I have an idea in mind, not sure whether it is possible to implement or not, so I need electronic experts here to give their advice. I have a very small palm size solar panel. need to build a circuit that can do the following : 1) The solar panel need to charge a small capacitor with a small capacitance, let say capacitor A 2) Then when this capacitor A is fully charge, it will charge capacitor B, which has higher capacitance. 3) The process of charging the capacitors with incrementally larger capacitance capacitor can continue to go on and on until some  level that I can make meaningful usage out of it, for example, run a corei5 laptop. (most likely I will use super capacitor at the last) My questions: 1) Is the above idea possible/feasible ? 2) If it is possible, will the capacitor lost energy very fast after some time? 3) I know people may suggest me to use battery, but I prefer capacitor or battery because battery life is very short compared to battery and it's not eco friendly either. 4) Any other concerns/warnings/advices are greatly welcome. Thanks :D

Posted by myuser001 6 years ago

replace battery with capacitor

Hello, I have a old hair clipper.  It has a rechargeable battery in it, which does not charge very well. I opened up the clipper and it has a single battery. It reads d-2/3a700 mAh 2.4 v. What do I need to do to replace with a capacitor?  Like resistors and such. If I wanted to get it to charge quick.  And use it quick. thanks

Posted by gregdove 4 years ago

Capacitor Power

I want these so badly, and I live relatively close (about 300 miles away).|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?

Posted by guyfrom7up 10 years ago

Ausfailia, where buy Capacitor

Hi, so I'm building a coil gun; as I'm sure many physics students do. I have blueprints set out and I have some circuit diagrams going, but I live in Ausfailia so I'm not entirely sure it's possible to buy remotely dangerous electrical equipment, such as a 450v capacitor, over the counter. Every common retailer only has shit-house miniscule ones for small circuits. Can someone who's overcoem this problem help me out?

Posted by Evanator1234 7 years ago

Adding Capacitors to a circuit board

I have a circuit board I made, very simple, you connect a 9 volt battery to it, power opens a relay, and turns on a green led, there is a zener diode (6.1v maybe, cant remember) for a flashing red led, the led flashes if the voltage drops below the voltage of the zener diode.  My questions are; 1.) If I add capacitors to this, will it extend battery life (about 4 hours right now) 2.) If 1 is yes, what kind of capacitor will I use? I work with capacitors every day, but bigger ones like 5mf 330V, 35mf 440v, dont know much about the smaller ones. 3.) If you can make something better, please let me know, it needs a power light, a low battery light, and a relay (SPDT, 9 volt battery is on the coils to keep relay open). Ideally I would like this board to have a long battery life.  Any help would be great.

Posted by EXL949 5 years ago

Building a capacitor charging unit

I was looking for a HowTo on building a capacitor charging unit. I saw a thread on a forum a while back that said you could create a large EM Pulse by sending a huge current down a coil of wire. I was looking about wiring up a bunch of these 220uF caps from Maplin;=12777&doy;=28m9#specThey are the last ones on the list.Would a few of these be sufficient to produce a large EM field, one that could fry sensitive electronic equipment. And how would i go about charging them all to the full capacity.Also while on this topic, would this be an efficient way of generating an EM pulse, or could you suggest any other ways of doing so.

Posted by EthanV2 11 years ago

need help with capacitor charger

I am new to this so please excuse my stupidity. I want to make a capacitor charger (for a small coil gun) I know there are instructables about them but they are all with chargers that came from a camera which I really don't want to do because i would like to make my own circuit that i can play around with and not blow it up by accident. If someone has a link to a project like this please post if not i have another question. Could I just take let's say a camera that has an 80uF 330v cap and switch it with a parallel bank that has 5 or more 220uF 25v caps or something larger. Would that work or would that blow the circuit or would it be better to buy the same caps as the camera and hook them together. Thanks

Posted by theugleymonkey 10 years ago

Rescue a defunct phone charger

I have an old cell phone charger that is very handy for charging my Kindle Touch and a set of Bluetooth earbuds. It quit working one day after someone used it to charge a high demand device. I read that the capacitors in these often fail. I got two electrolytic capacitors at a surplus store for less than a dollar total. I had to use a fine saw to open the plastic case. The new capacitors were the same electrical size, but not the same physical size. Closing the plastic case was not an option. I covered all exposed electrical contacts with hot glue, which is an excellent insulator. It looks ugly, but I have a good versatile charger again. (The high voltage connections are buried deep down where my fingers can not reach. As best I can tell, the terminals covered with hot glue for insulation are all low voltage.)

Posted by Phil B 2 months ago

Need Idea of what to do with this?!?!

I bought this "FLUX capacitor" at a closing antiques/random oddities place a few months back and am now being pestered to do something with it. If anyone has any ideas as to what someone (with beginer experience in most areas) can create with this as a base, please drop a comment, if better pictures are required, just ask and i will try and get better ones. Thanks, ~bIrD P.S. Sorry for the rotations on the pictures, don't know how to change it in instructables...

Posted by godofbird 3 years ago

3V Hobby Motor in a 6V Circuit.

Hi. Hope I'm posting appropriately. If not, please forgive an older guy! I'm working on a Useless Box project that I power from a 6V wall wart. I've already completed one and it works great. I use two standard servos with an Uno. But now, rather than being satisfied, I'd like to add a 3V hobby motor, which naturally would only run randomly for short periods of time. I have purchased an AMS1117 step down module which is rated at 800mA from Amazon to get the correct voltage for my little motor. My question is, do I need to add a capacitor across the leads or to the casing. If so, how do I determine what size? And while I'm asking, is there anything else I need to think about? I appreciate any help as this is a new hobby for me.

Posted by Steve_Lane63 10 months ago

How to read the value in farad of this capacitor?

Hi,  This is from a 1964 function generator and the capacitor of now "dry". Its maked as: ----------------------- SPRAGUE FILMITE "E" CAPACITOR 10.0 - 30 DC  127P1069R3S4 MADE IN U.S.A ------------------------ There picture is not THIS ONE, but its pretty close (of the big one) i would like to now what is the value of my capacitor. (10.0 - 30 DC) Is it 10mF? Thanks

Posted by johnybody 7 years ago

Over-Charging Capacitor

What happens if you connect some form of dc power source that supplies 100 volts to a capacitor that is rated for 100 volts, and leave it plugged in for a long period of time. would it eventually "over charge" and explode? would it over heat? would it loose its  ability to store energy?

Posted by merlinj 2 years ago

The rite resistor to charge this super capacitor.

    Hello I was wondering what resistor you guys would recomend for use in a capacitor charging circut. I can follow common sense for a small 160uf 300v photo capacitor. But this cap has a rating of 3,700uf and 600v. And considering its in issue, (which I believe it may be,) assume your giving it 18v of power from let's say... a drill battery.                                                      Thank you.

Posted by darthDIY 8 years ago

LED Capacitor Issue?

Ok, so i have a non alterable power source of about .75 volts. I need it to power a 1.8v red led. I don't want to use the joule thief to accomplish I hook up a capacitor to store energy, then transfer it to the led? or how can i get the led to fully illuminate? THANKS!!

Posted by Joe426 10 years ago

Free disposable camera's or their capacitors

I want to try my hand at making a very powerful coilgun but I live in a small town and our photography store doesn't sell used cameras for less than $3 each! Which means $30-40 or more for the coilgun I want and I don't have that much to spare :( So I'm hoping someone in Australia can possibly send me as many used cameras or capacitors as they can spare, I'd be willing to pay for them as well as shipping

Posted by grantdevine 10 years ago


I was thinking of making a welder that uses a capacitor bank, and does stick welding (STAW). How would I go about doing this? Any other ideas for homemade welders? A small desktop welder?

Posted by LinuxH4x0r 10 years ago

can anyone help an extreme amatuer wire a group of capacitors together?

I'm in the process of making a version of the tazor glove instructable, but I'm trying to make it more compact while still powerful. I've 'liberated' a few capacitors from some old pc cards but I'm not sure what I need to look for to know voltage or amps or whatever it's measured in, and some don't seem to any helpful markings at all. What I'd like to do if at all possible is wire as many capacitors as I'm able into a line that can circle the wrist, but I'm not sure how to do it or whether it would matter if the capacitors are of different sizes/powers. If someone can help I'd be very appreciative but keep in mind I'm a true amateur so any complex lingo will probably just confuse me, if you need to know anything else I'll let you know as soon as possible.

Posted by grantdevine 10 years ago

Post little Electronics you have removed/desoldered,ripped off of something(caps,chips,regulators,ext)

I found a Ton of Stuff from a PSU,from diodes to Capacitors to Leds. Post what you have found(in a picture:) ) And maybe your Desktop too.

Posted by ReCreate 9 years ago

Capacitor-bank safety issues

Okay, so I'm going to be the wet-blanket old guy.... Has anyone considered adding a topic to this group (or an I'ble) on electrical safety with supercaps? Even the low-voltage ones put out tremendous current, enough to put you into convulsions or stop your heart (50 joules) if applied correctly. These devices are amazingly cool to work with -- better than batteries when you need high current, outstanding AC line filters, and terrific party toys when you need some bang for your buck. They can also turn around and bite you on the arse without warning...

Posted by kelseymh 9 years ago

Ceramic capacitor in air conditioner DPAC12010H

Hi there,  I received a not-working air conditioner model DPAC12010H from someone who didn't need it anymore, and I took it to a friend who works with refrigerators to see if we could find the problem. We took it apart, and we found that a fuse mounted on the main PCB was shot. The fuse is 120V and 3.75A so I suppose it's only for the control circuit as the whole air conditioner runs at more than 9A on max capacity. Anyway, we temporarily bypassed the fuse with a copper wire to continue testing. We plugged it in, and immediately a component on the PCB (which I now believe is a ceramic capacitor) spew sparks and melted it's insulation. However after this incident the air conditioner works perfectly, and it blows very cool air (its a 12000 BTU machine after all). However I'm still concerned about that capacitor. I can not post a picture right now, maybe when I get back from work. It was brownish yellow, about 3/4" in diameter roughly same shape as a nickel. Does anyone have any idea what that capacitor might be for? Since the air conditioner is working now I'm guessing the sparks made it conductive, or maybe it's used for the dehumidifier which I have not tested.  I will buy a new fuse today and see what happens. The air conditioner draws about 9 A at full operation. Any help would be greatly appreciated.

Posted by colorex 5 years ago

about capacitors

I understand that capacitors store electricity, but what controls them. what lets them discharge?

Posted by kendallickes 9 years ago


Hey, selling a massive box of Cap's.... see here if interested;;=151394654697#viTabs_0 Thanks!

Posted by 75lockwood 4 years ago

HV capacitor bank charge indicator?

Hello! I have a capacitor bank with three 330v capacitors (from disposable cameras, of course... those things are awesome) connected in parallel, but I'm planning to add more. I'd like to indicate when the device has been charged using an LED, but I'm pretty sure that most LEDs can't handle 330v. The disposable cameras often have indicator lights, so how do they do it, and how can I implement it with more capacitors?

Posted by SirCheez 5 years ago

capacitors Preventing sparking

Im trying to build a sollenoid motor like this one;=channeland i need to no how to prevent sparking on the switch so that im not constantly having to replace it. ive heard somewhere that a capacitor will prevent a spark on the switch but will it? and how big of one will i need. thanks

Posted by budsiskos 9 years ago

Cheap Source of high votage capacitors

Anybody have any ideas where i can get high voltage capacitors for building a capacitor bank?

Posted by Marche 10 years ago

Can I charge multiple capacitors without a DIY DC/DC converter?

I'm starting to build the coilgun in rwilsford07's instructable but he says that camera circuits are very ineffecient and to try a DC/DC converter like in his other instructable but I'm hesitent to build it because it uses a wallplug to draw power from the mains and if something goes wrong I'm a dead man. So I'm wondering if there's a way to quickly charge the capacitors using car batteries (which I've got several of) or with an even larger capacitor (I've got a 2100v AC capacitor) Or would it be easier to buy somethng to suit?

Posted by grantdevine 9 years ago

capacitors amd leds

Ok, so i have 20 leds of different colors from radio shack(i know, got 50% off tho) a an experimentor breadboard, 4 mometary switches, and 4 330v 80uf capacitors. just wondering if anyone has any ideas as to what i could do with this stuff ive had sitting around for 3+ months. oh and i forgot i have a 555 timer chip too, dont know that ill be using it though. oh, and how do you charge a capacitor, like what is + and what is -, then any voltage applied is stored, right?

Posted by killmore231 10 years ago

My Capacitor Bank

This is a little project I've been working on for some time now, playing with capacitors to see what kind of sparks I can get. I finally decided to build a mounting board for them and glue them all together. You'll see before I glued them in, as I was counter-sinking holes for them to sit in. So far I have MOST of them wired together, in parallel, but I only hooked up the larger ones until I get all the "bugs" wrinkled out. I'm also using a relay circuit to switch the output from the capacitors (so I don't fry myself while they're charging). I have it set up with a 2-way toggle switch, so when I hold the switch to the right, it charges my capacitors, and when I flip it to the left, it triggers the solenoid, and I can then discharge the capacitors however I want. Right now I'm in the process of finding the right power supply, as I have both the relay, and the capacitors charging off the same 12V (1A) wallwart, but it's not enough juice for what I want. Enough to burn little holes in tin foil with the sparks, but It's just simply not dangerous enough for me! Me and nachomahma are working out something so an update will ensue! 

Posted by Punkguyta 8 years ago

Burning Arduino Uno Bootloader

I am planning to burn a bootloader onto an Arduino Uno using a Uno as an ISP. The instructions here:  say to put a 10 mf capacitor between reset and ground. But they to not say which Uno to put the capacitor on. Am I correct that it should be on the Uno to be programmed and not the programmer?

Posted by JRV31 3 years ago

Electrolytic Capacitor Horizontal Footprint Eagle

I am designing a very simple but small PCB in Eagle. Size is a constraint and the enclosure is pretty small. I had a 100uF electrolytic capacitor in the schematic which I realized will not fit vertically in the enclosure while making the prototype. So to make it fit, I kept a few mm of leads between PCB and capacitor while soldering and then bent it horizontally on top of a nearby crystal. This was a quick fix but now I want the schematic to have space for it. I have enough free space to put it lying down but can't find any footprint for a horizontal radial polarized cap. I'm sure I saw one such component in some schematic or in the library but can't find it. Even google results mostly gave axial caps. The only thing near to what I wanted was this diagram, but it had no footprint. The last resort will be to design my own footprint. Can anyone please help? -Antzy

Posted by Antzy Carmasaic 5 years ago

Circuit Help!

Hi, I'm trying to put together a basic circuit for charging a capacitor/s with a built in LED to indicate when it's charged. I've created a draft on Multism but can't seem to get it to work. I'm a complete novice at electronics and have pieced it together from various schematics I've found. Help please! :)

Posted by si_eng 10 years ago

Circuit Design Question

Ok, I have a power source that outputs about .5 volts sometimes, but at other times as much as 12 volts. I want the power to illuminate an LED in both cases, without burning it out. I think I need a capacitor for this but I'm not entirely sure? Can anyone tell or lead me to a tutorial or circuit diagram that shows how to do this? Thanks!

Posted by Joe426 11 years ago

Question dealing with high volt capacitors in series

As we all know (at least most) you can get free cameras at places that recycle disposable cameras. After having my fun hooking then in parallel to attempt coil gun, or just melting holes in water-filled soda cans. But I wanted to try to hook some in series, so instead of 320V, i got 640. I know series adds up so both are fully charged to 320V, but heres my question. 1: Can they ever blow seeing that the output is 640 yet their rated 320? 2: If i discharged between then, can i have a greater chance of them exploding comparing to parallel hooked?

Posted by Killa-X 10 years ago

Negative Ionizer

Hello. I want to make a negative ionizer. Someone could give me a circuit that you know works? Greetings and thank you all! This is a very bad google translation.

Posted by erdosain9 6 years ago

Current Problems with speakers...

Hey guys, I've uploaded some pictures of my problem. What I have here is an attempt to add bass to my speakers - I'm a newb, so this isn't going so well. The music is comeing from an iDock, and is being routed in parallel to a set of computer speakers. The right speaker has volume & tone knob, the left is simply plugged into the right. I unplugged the left speaker, took the circuitry out, and connected its input & output to a larger bass speaker - quickly was I suprised with a smoking capacitor (lol how healthy!) so... what should I do, simply add a resistor? Edit: Note the resistor (brown red red = 12k? or 1.2k?) is only in series with the LED and is not affecting the bass speaker. I am just wondering how a bass speaker could draw MORE amperage than the small speaker without any circuitry?

Posted by GreenD 8 years ago

The "Truth" about Tesla?

These guys at say that Tesla didn't invent the Tesla Coil, radio, or AC power. Now, I'll admit that I didn't read all of the arguments completely. I did, however, read the Tesla Coil page in its entirety. One claim is that the Tesla Coil was predated by one Elihu Thomson's patent  "Method of and means for producing electric current" (number 500,630). This patent was filed in 1893 - while Tesla's earliest patent on the Tesla Coil, "System of Electric Lighting" (number 454,622) was filed in 1891. Nice try. They are definitely correct, however, in saying that many parts of Tesla's history has been overly-dramatized. For instance, there is a claim that Tesla's remote controlled boat used a primitive form of voice recognition to take spoken commands from his audience. Obviously, it didn't, and the patents show nothing of the like. Do the other claims on their website have any merit?

Posted by ElectricUmbrella 8 years ago

substituting capacitors

I was designing a board that uses a bunch of the same chip and all of the inputs require a capacitor. For example lets say I have 10 identical chips with identical setups. Instead of having individual capacitors for everything to ground (except for the outputs) can I combine all of the ceramic capacitors and use a couple of bigger electrolyctic capacitors? So lets say I can have 1 capacitor for all of the identical inputs instead of 10 smaller ceramic ones. But for stuff like timing do I need individual capacitors?

Posted by guyfrom7up 11 years ago

Anyone have any capacitors laying around?

Hey, I'm doing some electrical engineering projects and I need some capacitors. Anything flash-capacitor-ish sized or bigger is best. Thanks, Ben

Posted by Ben Mighall 6 years ago