[media]http://www.youtube.com/watch?v=3N9UK-sbl1o[/media]
[editline]7th November 2014[/editline]
Because people say it doesnt work, here is the proof, enjoy ;)
What's the charger design you're using?
I don't think anyone said this wouldn't work. It was just stated that cranking out this much energy by hand would be futile. This video here shows that you've replaced the hand-cranking power source with an electronic charge circuit.
Is there a reason you're powering a small LED from a large capacitor bank? Why not just use a battery? In what situation would a super-capacitor bank requiring external circuitry to charge be useful?
[QUOTE=LoneWolf_Recon;46429644]What's the charger design you're using?[/QUOTE]
The charger is made with 2x LM317T voltage regulators, one for voltage control and one for current control. to output 2.5V and 1.5A.
[editline]7th November 2014[/editline]
[QUOTE=Ultraleet;46433590]I don't think anyone said this wouldn't work. It was just stated that cranking out this much energy by hand would be futile. This video here shows that you've replaced the hand-cranking power source with an electronic charge circuit.
Is there a reason you're powering a small LED from a large capacitor bank? Why not just use a battery? In what situation would a super-capacitor bank requiring external circuitry to charge be useful?[/QUOTE]
I know capacitors have small energy densities but there are pros than cons.
Pros:
Lightweight.
Stops acepting charge after being charged unlike batteries.
High charge/discharge count, these are rated 100.000 cycles.
Cons:
More expensive.
Need current and voltage control to charge.
You need more space to match the power density of a regular battery.
The reason i made this is because i wanted a flashlight that would charge in like, 2 min and get light for 10 or 20 min.
With this configuration i got from 0.020mV to 1.9V in 35 Min and lasting for 1h and 20Min before the light was too dim to be usable, was 0.902V then.
I might use the capacitors in series and parallel(half the capacitance) to be charged up to 5V without the current limiting circuit, atx psu's can give 30A on 5V output so it will charge like in 30 sec to 4V.
Yes i might discard the circuit and use it as a variable power supply, just need some pots.
I would recommend checking out Maxwell BoostCap ultra-capacitors if you're going to continue using a charging circuit. They will provide exactly what you are looking for. Depending on your charging circuit, a 20 minute charge could provide you with many hours of light.
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