Search for Capacitors in Topics

How come capactors are used so much in electronics for exampel: https://www.instructables.com/id/Portable-USB-Charger-Version-2.0/ what are those 2 capacitor doing?

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.

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

Hey, selling a massive box of Cap's.... see here if interested; http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item;=151394654697#viTabs_0 Thanks!

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?

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?

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

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!

(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.)

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 :)

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?

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?

I need to replace three 470 uF 25V caps but I was wondering if using 1000 uF 25V caps would work or not?

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

Can someone identify the following MDC.05 +80%Z5U 20%1KVIs this a .05uF capacitor rated at 1000volts?

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. 

Is it possible to put 25 microwave capacitors (2kv 1uF) in series and running 40kv through it without them failing?

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

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

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.

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

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

I can't find 4.7pF ceramic capacitor

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.

I would like to know if I can hook up a capacitor to the incoming power being generated by my windmill so I can up my outage? I've been reading that you can use a capacitor bank to step it up. Thanks?

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

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.

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

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?

Recently I've had an idea for a project that requires a relatively low voltage (5 to 30 volts) capacitor bank. However, that capacitor bank needs to be charged. While I do know you can easily just hook it up to power, I find that too simple, and lacking of safety, and knowing when it is fully charged. So, could anyone please enlighten me on how i can charge my cap. bank relatively slowly, with, say, an LED that lights up when charged (to avoid them blowing up in my face), and a kill switch/button that discharges the capacitor bank in the event of an overcharge. If anyone could provide an explanation or circuit diagram that would be great, thanks. BTW, the capacitors I was planning on using are http://www.goldmine-elec-products.com/prodinfo.asp?number=G17623 or http://www.goldmine-elec-products.com/prodinfo.asp?number=G16573.

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

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?

Hi everyone, I took apart an old Amateur Radio i had lying around and the boards have loads of parts, im wondering what i can use some of them for, most of the boards inside have lost of 16v capacitors and ive read instructables on making battery free torches etc, would these be of any use fpr these type of projects? Ideas welcome :) Cobs

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.

What are batt-caps, how do they work, and how would 1 be wired to a 1.5v battery? what are some specific names of different batt-caps?

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

M just curious about capacitors that the voltage they store when they get charged i have two capacitors laying around for test  on one is written 400v 22uf other is 420v 100uf so how much voltage can they hold when they get charged fully ??? and any simple way to charge them ??? i want make something for shocking pranks.... :D

Howdy all, Recently got back into basic electronics and have started building kits. Been building a kit that uses tantalum capacitors and it notes that polarity orientation is very important. The question I have is: is there some un-published indicator of how polarity is indicated on these tantalum caps? I've been over these things with a microscope, even bought new ones, but other than the values & manufacturer, I can find no obvious sign of polarity. Leads are the same length and not marked. What am I missing? Thanks in advance for any help. Dave

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. 

Does the capacitance stack in a bank? Does the maximum allowed voltage? How do you wire an SCR? How do I determine what the total output voltage/amps will be?

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?

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

What is the average capacitance of a salt water beer bottle capacitor?

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

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

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

I got this from a lightbulb. (three way)

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?

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. 

How can i make a single lead capacitor for this https://www.instructables.com/id/DIY-Lightning-Wand-a-Handheld-Van-de-Graaff-Genera/