Capacitor? Answered

Can I make a capacitor out of plaster Paris/fix-it-all and washers ?

Asked by wiccakingkamui 5 years ago  |  last reply 5 years ago


capacitor?

Hello my friends, i didnt post any instructable latly because i am in school and end is near.... but now i am working on few projects, and for one of them i need capacitor 1f 5.5 v. so my question is how long can this capacitor power the single white LED?

Asked by tealk 5 years ago  |  last reply 5 years ago


capacitors

So i'm trying to make a power supply, so for example if i make one with just capacitors (ill put a schematic if i can) and i hook it up to a device,Will it just discharge immediately or will the charge ask for a while?

Posted by minecraftpotato 5 years ago  |  last reply 5 years ago


capacitors

I recently took apart an old stereo reciever that didnt work anymore. As always, I salvaged as much stuff as I could, and came across 2 huge capacitors. They are each about the size of a C- batery,and are rated at 50v, 6800 uF. I, of course, saved them, but now I cant think of anything to do with them!if anyone has any ideas, please let me know stat.

Posted by tigerdog330 10 years ago  |  last reply 10 years ago


What are capacitors for? Answered

What are they for I've seen them everywhere... are they used to hold power?  

Asked by RelientOwl 8 years ago  |  last reply 8 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  |  last reply 11 years 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 11 years ago  |  last reply 11 years ago


Capacitor Charging?

How do I charge a capacitor rated for 450v at 1150uf using 2 AAA batteries? I tried using a mini transformer but it takes a very long time. Is there a quicker solution? Thanks in advance, IndianHacker

Asked by IndianHacker002 3 years ago  |  last reply 3 years ago


Capacitor problem Answered

I needed a 2.2 and a 10 uf capacitor to make a metal detector, but the values printed on my capacitors are not less than 5. I want to find that if the values on the capacitors are in uf, nf or pf. And if they are none of them. 

Asked by tanyutsharma 4 years ago  |  last reply 4 years ago


Capacitor charger? Answered

Ok so im planning on building a portable coil/rail gun. But one issue is I cant quite find a circuit that would work best to drive a custom transformer. The charger I have now is a flyback driver that I used a wall adapter to power. I just need some advice and maybe schematics. Thanks, bud

Asked by budhaztm 6 years ago  |  last reply 6 years ago


Capacitor charger

I want to build a fast simple capacitor charger with minimal components. i was going to builda dc to dc converter. but then came across this picture from here i am going to replace the switch with a 555 timer and transistor . does any body know if this circuit is any good or has any body built it

Posted by chrischavez 10 years ago  |  last reply 10 years ago


about capacitors

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

Posted by kendallickes 9 years ago  |  last reply 7 years ago


Resistors and capacitors Answered

Can any one tell me how can we use and install resistors and capacitors? And how can we study the resistors and capacitors

Asked by k.bipin 9 years ago  |  last reply 5 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  |  last reply 11 years ago


Shorting Capacitors? Answered

Hi Guys, Recently I found a person selling a power supply for $3 and I thought why not to buy it and salvage the components. I was wondering will it be safe to short the huge capacitors in the power supply? Thanks :)

Asked by The Prickly Potato 3 years ago  |  last reply 3 years ago


Is this a capacitor or a battery? Answered

In regards to my "battery free bike light".   I was told that a dynamo flashlight charges a capacitor.  Is this the case? Take a look, Thanks

Asked by onrust 8 years ago  |  last reply 8 years ago


for what this capacitor is ? Answered

I can't find 4.7pF ceramic capacitor

Asked by Rendydevara 8 years ago  |  last reply 7 years ago


Help with capacitors

Hello everyone. I've seen this instrucable (https://www.instructables.com/id/ETJBV68MFMEV2ZAU7T/?ALLSTEPS) that uses a charged capacitor to light up a LED.I found this very interesting, so I started investigating what a capacitor is.So far so good and my questions are:- Can capacitors be used as replacements for batteries? I'm thinking specifically to light 1, 2 or 3 LEDs.- If so, how can I calculate the specs of a capacitors for a determined amount of LEDs.- Is it possible to calculate how much time the capacitors will keep the LEDs lit?- How can I determine if the capacitors have enough charge to light the LEDs?- Would you be kind enough to suggest a circuit to achieve any of these?Thank you.

Posted by transistor 11 years ago  |  last reply 11 years ago


Big Capacitors

I found a big capacitor in a floor cleaner...I think. It is a black cylinder with two leads off the end. In the floor cleaner, it was hooked up to a lot of stuff in a really important looking box that had a lot of wires flying everywhere. It looks sort of like the thing below, but a little smaller. So, really, there are two questions: 1. Is it a capacitor? 2. If it is, what can I do with it? Thank you!

Posted by basementhacker 5 years ago  |  last reply 5 years ago


are these really capacitors?

Http://www.mouser.com/search/ProductDetail.aspx?R=XH414H-IV01Evirtualkey62800000virtualkey628-XH414H-IV01EI'm only asking because either the manufacture doesn't know what they're talking about or it's a battery with it's capactance measured in farads. The say rechargable capacitor. That's the only reason why I feel causious

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


Are these Capacitors Fried??

I think i blew out a cheap voice chance I have... can anyone verify that the capacitors I have circled are indeed blown... I've never looked before, and am not 100% sure the black isn't just a manufacturers marking. also, the caps are 20pF and 56pF and I need to replace them STAT... would Radio Shack's 100 pack capacitor grab bag have these numbers?

Posted by gschoppe 11 years ago  |  last reply 10 years ago


capacitor help

Hey everyone i was wondering if someone could help me, I have a capacitor row (as shown below) and i was wondering what i could do to make it a shocker type thing? Any help would be greatly appreciated.

Posted by lakeside69 11 years ago  |  last reply 11 years ago


Capacitor Help

I am trying to build a lab power supply which I need to complete in order to continue an electronics course I am taking. The schematics require two 4400 uF capacitors, which for the life of me I cannot seem to find on any website or store. I was wondering if it is possible for me to use a slightly higher capacitor without causing electrical problems?

Posted by Sedgewick17 10 years ago  |  last reply 10 years ago


On capacitors and polarity.

(Asked twice already, but for some reason was not visible.) That is sort of a blanket question. I'm wondering: 1) why only some, and not all or none? 2) what (in their physical structure) causes them to have polarity? 3) why do we make ones that have polarity? Is there something prohibitive, like cost, or safety, making it so in the production? (okay, not safety, as may attest anyone who has seen a reversed capacitor explode.)

Asked by V-Man737 9 years ago  |  last reply 9 years ago


Giant Capacitor

Our microwaved died in my house so I took it apart for parts. I found a Giant Capacitor, its about 4in x 2in x 1in It has 3 Leads coming out of it and somthing that attaches to a panel, im guessing the ground. Does anyone have any idea what i could do with this let alone charge and have it release its energy all at once. Of course I have to clean it and am aware it could kill me at any time.

Posted by acer73 11 years ago  |  last reply 10 years ago


What type of capacitor are these? Answered

Hello . I just get some non-polarized capacitor .But What type of capacitor are these? Thanks!

Asked by login721 6 years ago  |  last reply 6 years ago


Wiring Capacitors In series?

What are rules for wiring multiple capacitors in series? Especially when The voltages are different. If i wire two 80v's with a 200v what would my WV be?

Asked by erncar 6 years ago  |  last reply 6 years ago


How to use capacitors?

So I just received my sample capacitors.  They are supposed to be 5 kv and a significant capacitance but I don't believe that they are. they are way too small.  I also want to know how exactly to use them, any ideas? 

Asked by jj.inc 6 years ago  |  last reply 6 years ago


Tesla coil capacitor? Answered

Made a Lynden jar capacitor and my TC won't spark at the gap but I can hear my capacitor trying to work what do I do

Asked by wiccakingkamui 5 years ago  |  last reply 5 years ago


How to charge this capacitor? Answered

I got this from a lightbulb. (three way)

Asked by Xixfas 5 years ago  |  last reply 5 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 2 years ago  |  last reply 2 years ago


Non polarize capacitors?

I would like to know two polarize capacitors joining negative to negative whether can be use as a non polarize capacitor. Thanks.

Asked by tuanb 8 years ago  |  last reply 8 years ago


HV capacitor leakage? Answered

I have just built a high voltage glass capacitor for my Tesla coil at a 0.03uF 50KV rating and I have found that the leakage is quite high, the stored energy is almost completely gone in 15 seconds does anyone know how to resolve this?

Asked by The MadScientist 7 years ago  |  last reply 7 years ago


What kind of capacitor is that?

So I've been trying to make a simple radio circuit based off of this schematic (http://www.electroschematics.com/wp-content/uploads/2010/02/small-fm-radio.jpg) , 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 4 years ago  |  last reply 4 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  |  last reply 4 years ago


Variable Capacitor Replacement?

Do you think it would be possible to substitute a variable resistor and a normal capacitor for a variable capacitor? The way I figure it is that a variable capacitor is supposed to adjust how fast said capacitor charges and discharges, wouldn't a variable resistor and a normal capacitor also function like this? I'm working on an idea for a small am radio, and looking to substitute these parts. Could it work? Thanks

Asked by transistorguy 6 years ago  |  last reply 6 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 3 years ago  |  last reply 3 years ago


Motherboard replacement capacitor??

I have an Asus M3A79-T Deluxe motherboard I recovered, and one of the capacitors looks to be ripped out of place. Does anyone know where I can buy or find the correct replacement capacitor? I have identified which capacitor it is I just am lost on as to where I can get another one. It has this on the capacitor: Some obscure F in between two lines 89He 101 16

Asked by XP1 5 years ago  |  last reply 4 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 this....so...Can 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 11 years ago  |  last reply 11 years ago


Coilgun Capacitor Question?

I have a big capacitor that I found in my old xbox. It's 250 volts and 470uF. Would this be better than using a bank of 8 camera capacitors?

Asked by Shadow94 9 years ago  |  last reply 9 years ago


How to charge a capacitor? Answered

I read some where that you need a rising amount of volts to charge a capacitor, but I also always see around that you can just charge a capacitor on just a straight battery that is DC. I am very confused how you can and should charge a capacitor.I think the formula for charging a capacitor is i=C(dV/dT)Thanks

Asked by squirt8500 9 years ago  |  last reply 7 years ago


capacitors Preventing sparking

Im trying to build a sollenoid motor like this one http://www.youtube.com/watch?v=e3tcdiO2HCc&feature;=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 10 years ago  |  last reply 7 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  |  last reply 10 years ago


Weird Capacitor thing? Answered

I have this capacitor looking metal can, but when my dad was in Russia, the seller said it was not a capacitor, but something else. It has markings on it that say 5.5V and 1.0F. I put some Pics on as well. The seller said it was used in answering machines to save messages, sorta like a CR2032 battery in computers. I want to know if it can be used in a pocket torch, like a rechargeable capacitor, etc. Help!

Asked by Colonel88 9 years ago  |  last reply 8 years ago


help with capacitors please? Answered

I am trying to double the output of a 1.5v battery to 3v i have setup a capacitor parallel circuit like this                --------------+ capacitor - -------------+ capacitor - ---------------                                                                                                                                  +                                                                                                                     Battery                                                                                                   -------   + Multimeter           -                                                                                                             -------    - Multimeter               -------------------------------------------------------------------------------  However i am not getting the output of 3v, i did this yesterday and had 3v but today im only getting 1.5 i tested the battery on its own and that is 1.5 so why is it that i am not getting 3?

Asked by connorfrancis 7 years ago  |  last reply 7 years ago


what is the capacitor code?

I have a green capacitor that has the code, .22k 100sc What is the value in uf?

Asked by madman11 9 years ago  |  last reply 9 years ago


capacitor bank questions.

Hello all, this'd be the first post i've ever made, and may be in the wrong place....... edit- i guess it was in the wrong place, since no one replied.... so i'll try here.... i'm tryin to make a cap bank from 30+ flash cameras (possible? possible outputs? how do i calculate that?)  and i have some question/problems. is it possible to take a bank like the above and use as a spot welder?   if so, how would i trigger the spark without the trigger becoming the spark gap?  another possible use i have for it is a rail gun...... theoretically, if counter evidence isn't provided by all of you much more tech inclined ibblers a second concern is that the caps come in at least three different micro farad ratings. would one explode if it's rating is lower than the higher ones?  (the ratings are between 80ish to 150 ish (don't remember)) i rather need the weilder for a possible steampunk project that i just bought a bunch of metal junk for....(knowing me though, i'll never get around to doing it....)

Posted by badideasrus 8 years ago  |  last reply 8 years ago


Help for Replacement capacitor ? Answered

250v185j cl21 capacitor  burned from  old portable rechargeable fan what can i do.. pls help me for  replacement capacitor in india

Asked by RaviT120 1 year ago  |  last reply 1 year ago


What the purpos of the Capacitor ?

Hello everyone. My question is : In this circuit What the purpos of the Capacitor ? Thank you

Asked by layal_1 6 years ago  |  last reply 6 years ago


Help with charging capacitors

How do I charge my 450v capacitors with a 120v outlet? I am building a rail gun and need to get these up to a high enough voltage. 

Posted by gclark0812 1 year ago  |  last reply 1 year ago