Voltage doubler ripple

[lowell]

Hi have a tube pedal that could have some improvement in regards to 60hz hum. It uses the votage doubler circuit below. I was thinking of adding a diode across the "top" capacitor w/ the cathode on the + supply to reduce ripple. Would this work?

[loudthud]

The extra diode won't really do anything except protect the top cap against reverse voltage. This circuit produces 120Hz ripple although there can be a 60Hz component if the caps are mis-matched.

[Chuck H]

Even some hi fi gear uses a voltage doubler supply (The Fisher 500B & 500C come to mind). Perhaps additional filtering would help. Maybe follow the
rectifier with a Pi filter before tapping in.

That is, if it's actually 120hz you have. If it's actually 60hz, then what LT said.

Chuck

[guitardude57]

Here is another doubler circuit that has no 60hz issues

[lowell]

thanks I'll try that sometime.