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?
Question by Balls of Kevlar | last reply
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.
Topic by tigerdog330 | last reply
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!
Topic by DELETED_DELETED_basementhacker | last reply
(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.)
Question by V-Man737 | last reply
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?
Topic by gschoppe | last reply
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?
Topic by guyfrom7up | last reply
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.
Topic by guyfrom7up | last reply
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.
Topic by transistor | last reply
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
Topic by guyfrom7up | last reply
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
Topic by chrischavez | last reply
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?
Topic by Sedgewick17 | last reply
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.
Question by LiquidLightning | last reply
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
Question by budhaztm | last reply
I want these so badly, and I live relatively close (about 300 miles away).http://cgi.ebay.com/Qty-46-Pulse-Capacitors-7000v-230uF_W0QQitemZ200268515465QQcmdZViewItem?hash=item200268515465&_trkparms=39%3A1|66%3A2|65%3A15|240%3A1318&_trksid=p3286.c0.m14You can make one heck of a capacitor bank, releasing almost half a megawatt in a split second.My only problems:I don't have 1600 dollars, crycry.These things are so large that if I were to line them up side by side (so that the thinnest parts create the overall thickness) it would be 25 feet long, 14 inches wide, and almost a yard tall. THE POWER BOGGLES THE MINDI'm so mad, if I was an adult I'd buy these in a heart beat... sigh... deal of a life time... I hope not...and best of all, they are PULSE CAPACITORSthoughts? comments?
Topic by guyfrom7up | last reply
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
Topic by Cobra_SFX | last reply
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.
Topic by acer73 | last reply
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
Question by D3zire | last reply
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
Topic by gutbucket | last reply
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?
Question by connorfrancis | last reply
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
Question by transistorguy | last reply
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.
Topic by ChristopherC297 | last reply