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Homer Being asked Is it possible to make a variable high current power supply?
with just resistors, capacitors, pots and transformers. Most power supplies have transistor regulators in them, but I dont really understand what they are needed for. I just want to make a 30 amp 12 volt power supply that has both variable voltage and current.
And got the following answer:
yes, if you have a variable transformer (variac). Otherwise, no. You need something to adjust the voltage. And simple components won't do it. For a simple adjustable voltage supply, the phrase "variable current" has no meaning. The current will be whatever the load demands up to the point where it overloads and goes into current limiting, or pops a fuse. There are more complex supplies where you can set the voltage and current, but they involve several feedback loops and are quite complicated.