On 25 Sep 2006 at 23:37, Josh Koffman wrote:

> Now, if I put a filter cap across that signal I can get a steady
> voltage...but what is that voltage? Is it 170V (120*1.414)?

Yes.

> How do you calculate the value and rating of that capacitor given the
> maximum current draw? I can't seem to remember any of my capacitor
> formulae (or even if I knew one that would have helped in this
> situation).

1 Farad 1 Amp 1 second = 1 Volt.

A decent rule of thumb for your current setup is 7 or 8 volts ripple peak-to-
peak with 1000 uF at 1 amp load. If you want less ripple, use more 
capacitance.

Cheerful regards,

Bob

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