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The power supply is only about 3 volts but hundreds of amps, it will have been passed through bridge rectifiers but can be modified while it is still ac. I know all about the laws of resistance and everything. Why I'm wondering is what is the cheapest way to using a knob vary the current and still be able to Handle it. The king of random created a model which did exactly what I want however it was to big for my liking, I want something small. I find it very unlucky but is their a potentiometer or something that can handle this amperage?(doubt it it works probably melt) and since its such a low voltage the resistance would have to be very small. Any ideas? The load will draw much more current than I want to give it I would actually like to have the voltage fixed. I want the final dc output to be at 2.5volts, which means the transformer will need to output 2.5 + the voltage drop of the rectifiers correct?
And got the following answer:
I find this request really strange - 1 - hundreds of amps can not be controlled by something small - even the slightest resistance will produce a lot of heat. Old theater dimming rigs used huge carbon disks to drop DC current by resistance. 2 - Current flow is controlled by voltage - controlling a DC output at 3 volts in tiny fractions of a volt to control the amps into nearly zero resistance (which would have to be to allow hundreds of amps to flow with only 3 volts driving) is prone to failure 3 - So you go back to the AC portion of the circuit. There you use thyristors (Triacs & SCR) to phase control the output with fairly massive capacitors in order to smooth out the pulses of the 1000 watts or more (3 volts at 335 amps is 1000 watts) http://mikegigi.com/control.htm