Quote:
Originally Posted by Besoeker
Capacitor C1 is directly across the single phase input rectifier in the diagram shown.
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That's not a single phase rectifier, and C1 isn't a part of a “smoothing” circuit to take out line ripple. It’s a part of the voltage doubler, and works in conjunction with C2 in order to cater for the US market where the line voltage is 110 volts.