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easy way of converting dc into ac

does anybody know of an cheap simple circuit, using only a few components, to convert dc into ac or pulsed dc? I'm going to be using a super capacitor that's rated for 2.5 volts and I want more out of it, so the output is going to be put through a voltage multiplier circuit.

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tech-king8 years ago
id say hook them up in parallel. i have no idea about different transistors, but i do not think the 2n2907 is interchangeable. i tried that on another science project, and got poor results. you could ad a V multiplier. the one below is a multi-stage cascade, so you can simply add more stages to it. unmodified, its an 8x multiplier. ignore the text, its from the 4x multiplier. the smaller the capacitors are, the more ripple there will be in the circuit.
instructables.jpg
guyfrom7up (author)  tech-king8 years ago
Ok, that's what I was originally going to do, I'm going to buy a bunch of the transistors and have a bunch of trial and error, I'm going to try and not use the transformer because What I need to build has to be light, and simple. Also the bigger the capacitor means more amps? This is meant to drive a motor (+ gain more knoledge on ac circuits), I'm just seeing if I can power it off of this, if not I'll go back to a more complicated dc-dc converter.
the lower the value of the caps, the more ripple in the circuit. you could either use large, high value caps to keep ripple low, or use an inductor (choke). the more ripple, the closer to an AC sine wave the circuit is.
guyfrom7up (author)  tech-king8 years ago
so size of cap doesn't matter for amps? I'm goingt o use the smallest caps then!
as long as the caps are rated to the voltage.

small caps=lots of ripple.
guyfrom7up (author)  tech-king8 years ago
I want to thank you sosososo much for all of your help!
no problem. play safe with the electricity.
tech-king8 years ago
yo probably could hook it directly, but id go with the transformer for isolation purposes. as you may or may not see in the picture, DO NOT touch the wires on the secondary side of the transformer. plus, the transformer is a stock one, not one that needs to be re-wound.
guyfrom7up (author)  tech-king8 years ago
ok, I might make my own tiny toroid wound transformer because this thing has to be really light. Do you know at what frequency this schematic operates at? Can it be adjusted?
I'm not sure. i just fried my last 2n2907 20 min ago, so i have no way to find out (until tomorrow anyhow). however, its a high enough hz to power a fluorescent or neon lamp.
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