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Wolf asked how to build a variable voltage supply?
I want to build a variable voltage supply (maybe 2) I want variable AC voltage and Variable DC voltage. Mainly I want to make a variable DC voltage supply. Does anyone have a schematic I can go off of? I'm also looking for it to be CHEAP, I don't want to spend more than maybe $30 on it, preferably less. Anyone have any good ways for me to build one?
And got the following answer:
http://www.electronics-lab.com/projects/power/011/index.html This should fit the bill. If you look at surplus dealers you may be able to get it down to 30 bux The ac supply is more difficult. A variac transformer is the usual way we would do this. Maybe you could adapt one of these designs http://www.ibiblio.org/obp/electricCircuits/Exper/EXP_4.html