Super Capacitor
@ October 19, 2008
Vendor's part webpage:
Price:
$4.95 USD
- Component category: Electronics in general
Vendor's Description:
Description: Yes you read that correctly - 10Farad capacitor. This small cap can be charged up and then slowly dissapated running an entire system for hours. Combine two in series for 5F/5V. Do not over voltage or reverse polarize these capacitors.
Description: Yes you read that correctly - 10Farad capacitor. This small cap can be charged up and then slowly dissapated running an entire system for hours. Combine two in series for 5F/5V. Do not over voltage or reverse polarize these capacitors. (from Sparkfun)
Just as a reminder:
Capacitors in series get a total capacitance(Ctot) of:
(1/Ctot)=(1/C1)+(1/C2)+...+(1/Cn) which is like saying Ctot=[(1/C1)+(1/C2)+...+(1/Cn)]^-1
Capacitors in parallel get:
Ctot=C1+C2+...+Cn
The voltage rating is the max voltage it can take. (http://letsmakerobots.com/node/1988)
some formulae:
i=(f/R)*e^(-t/τ)
ΔV=f*e^(-t/τ)
where τ=R*C
and f is the potential difference of the capacitor at the beginning
@ Thu, 2010-04-08 08:39
Currently
Waiting for delivery on a nice 30F cap to use as a power levelling and storage device in a planned solar powered weather station.
It's rated at 2.7V, so i have it sitting between the parallel solar array (2 panels :P) that puts out 1.V, and a pololu voltage boost that then steps 1.5 up to 5V, suitable for running logic and transmitters.
@ Tue, 2009-01-20 06:08
Jaw dropping
Well now that my mouth is dry and my jaw is back up, WOW! I want one! These would be great for little solare powered racers like the ones from Solarbotics!
The world's best motto: When all else fails, use a bigger hammer.
@ Sun, 2008-12-28 14:33
Higher voltage supercaps.
@ Sun, 2008-12-28 14:04
Even
@ Thu, 2008-10-23 17:01
I have a capacitor thing I
@ Mon, 2008-11-10 18:00
unless you plan on using a
@ Tue, 2008-10-21 01:01
Woot
@ Mon, 2008-10-20 20:29
I have a really stupid
I have a really stupid question...
Lets say you hook up batteries to this thing ti charge the capacitor. In theory can you then remove the batteries and let something run off of the charge in the capacitor until it is drained? Seems like a cheap option to recharable batteries... I need to dig into capacitors more to learn how to figure out which type/specs go with each use, but this seems feasable to me anyway.
@ Tue, 2008-10-21 01:00
Yes
As far as I understand, this is correct. You can use this site to figure out how long it'll take to discharge:
http://www.cvs1.uklinux.net/cgi-bin/calculators/time_const.cgi
The resistance will be the resistance of the circuit plus any additional resister you add to slow the discharge. Be sure to use owms law to calculate the Amps that it'll output as well. You don't want to burn out your circuit.
@ Tue, 2008-10-21 11:12
uhm but what voltage will
uhm but what voltage will you have from it while it discharge?
let's say that i want to run an arduino board with those caps, how should i set it up ?