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You said you are going to use a DC regulator

They usually accept a range of input voltages and knock it down to the desired voltage. To get 5 volts DC, you can start at 6.3 volts RMS AC.

[I have just been working with my supply, but I went with too little voltage to the regulator: 6.3 RMS AC to 5.5 volts DC. It was suppose to be 6.3 volts DC! Oh well, it runs cooler and still sounds the same to my ears -- my goal was to run the regulators cooler by dropping less voltage, but they have a mininum of 3 vols DC differential in order to operate within specs. I think it is an LM317 regulator on heatsinks.]



Edits: 05/25/12

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