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Technical and scientific discussion of amps, cables and other topics.

Re: Using larger power transformers in low power-draw source components

What you may wish to do here is reinstall your 30VA transformer and use a variac to adjust the AC line. Set the variac to 120vrms, verify this with a meter and then read the voltage on the unregulated section of power supply at the 680uf supply caps. At 120 vrms with your 30 VA transformers your should read about 21 volts DC. If you read something else..... than we need to explore further. I think one of your "assumptions" on this circuit may not be what you think it is.
d.b.
P.S. with the kind of current draw you describe; I would think about using 2,200uf.


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