Can I make a capacitor out of plaster Paris/fix-it-all and washers ?
Question by wiccakingkamui | 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
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
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
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 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
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
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
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
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
(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 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?
Question by The MadScientist | last reply
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?
Topic by Actan | last reply
Hello , i just bougth some capacitor from electronic store.In my country ,English is not the nature language ,so i dont know what is the name of this type of capacitor in English .they have number 104( 100nF) and other is 105(1uF).And they dont have mask witch pin is + or - pin.Thay mean they are Non polarized capacitor ?? Here is the image of them . Thanks ! p/s: sorry for my bad English.
Question by login721 | 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
Why Is There A Capacitor In A Microwave? Also, does anyone know what kind of capacitor is it? Thanks :) I'm making a "What's Inside A Microwave" Instructable, And I'm interested what does it do, And I want to explain it...
Question by Yonatan24 | last reply
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?
Topic by merlinj | last reply
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
Question by XP1 | last reply
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!!
Topic by Joe426 | last reply
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
Question by squirt8500 | last reply
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
Topic by budsiskos | last reply
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?
Topic by killmore231 | last reply
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!
Topic by Punkguyta | 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
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!
Question by Colonel88 | last reply