9Volt Battery From A Cap

[Torchy]

Interesting article here for a rechargeable 9V battery from a capacitor. Not sure where to get the 10Farad supercap though ... ...

http://www.elektor-electronics.co.uk/miniproj/details/030109.htm

[Gilles C]

I think I will stick to batteries...   $$$$$$$

http://www.brilliantstore.com/electronics2/pyle-plcap6100d.htm

[Torchy]

Thats not just the cap though, its got extra components and is designed for a particular application. The circuit I posted calls for a simple goldcap. Elektor dont publish mini-circuits that cost the earth.

[smoguzbenjamin]

I buy rechargeable NiMH PP3 batteries for about â,¬11,- and â,¬8 when they're on sale... I try to have one charged, especially with wireless and all that jazz.

[Mark Hammer]

There was a neat article on making a hand-crankable power source, for an emergency flashlight in Nuts and Volts a few months back.  The core of it is a stepper motor.  Motors, of course, become generators when manually cranked.  In clever fashion, the outputs of the stepper motor are summed together to yield more current.  I gather this is part of what makes those hand-crankable radios that go for an hour on 1 minute of cranking function so efficiently.  Well, that, and good batteries  and an efficient low current radio circuit.

It IS technically possible to store up a big chunk of electron juice to do serious work if you have enough low leakage capacitance to store it in.  The practical question is whether that requisite capacitance results in a package size and cost that is prohibitive, relative to batteries, and whether the hand-crank system accumulates charge for storing faster than the cap/s leak it.

[petemoore]

My Shaka tube can run for 10 minutes with the circuit PS disconnected, the voltage drops very slowly, using Plate fto ground for the readings, or waiting till the sound level fades, then starts cutting out.
 I thought because the PS was disconnected and signal passed that I had a problem for a while, but pulling the tube put an end to that, then measuring the voltages enlightened me that the capacitence of the PS or circuit caps were storing charge.

[Nasse]

IMO the elektor circuit is very cool but sure has drawbacks, some mentioned in article

If I understood (or remeber, I can not open the pdf file just know, have been strugglin with viruses on my computer lately and my settings are little bit mess) right it has some kind of oscillator or "switch mode" thingie onboard, if so I have a fear that it might feed trough without special arrangements - I may be wrong, and it maybe could be worked over, like building the power pack in separate case and extra filtering

But for non audio circuits this sure looks fine and ingenious, quick charge and adequate capcity

*edited* I read the article that was visible for me and it was mentioned it has some kind of voltage multiplier, that made me thinkin power suplly noise when first read it... But it can be recharged in few seconds, and that is very very interesting if you think the benefits in some applications

[Ansil]

anyone know where to get those caps...
edited

http://www.panasonic.com/industrial/components/pdf/ABC0000CE8.pdf


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