Tube Practice Amp Adding Reverb

[g1]

Thanks for the schooling fellows. [insert embarrassed emoticon here].

[Helmholtz]

It's a doubler but I think the bottom two diodes of the bridge are redundant. They will always be reverse biased.

I agree, but think that the circuit posted by Chuck as is has some different benefit/reason.

First I noticed that if the junction between C1 and C2 were not connected to the rectifier bridge (terminal #4), the circuit would act as a standard bridge rectifier and its DC output would be halved.

But this also means that the circuit shown provides a simple way to double the DC output of an already existing bridge rectifier supply: Just add 2 caps and one wire (and double the voltage rating of C3). Voila, ecce, eccolo..

[nickb]

I agree, but think that the circuit posted by Chuck as is has some different benefit/reason.

First I noticed that if the junction between C1 and C2 were not connected to the rectifier bridge (terminal #4), the circuit would act as a standard bridge rectifier and its DC output would be halved.

But this also means that the circuit shown provides a simple way to double the DC output of an already existing bridge rectifier supply: Just add 2 caps and one wire (and double the voltage rating of C3). Voila, ecce, eccolo..

The circuit is a commonly found arrangement dual voltage SMPS front ends.

[Helmholtz]

The circuit is a commonly found arrangement dual voltage SMPS front ends.

Interesting, thanks.

I guess you mean at the secondary of the flyback transformer? Should be fast switching/recovery diodes then. They probably use integrated bridges, not discrete diodes, right?

[Dave H]

I've seen it directly on the mains input for 115/230V selection.

[Helmholtz]

I've seen it directly on the mains input for 115/230V selection.

[ATTACH=CONFIG]55837[/ATTACH]

Makes a lot of sense. In this application you actually need all 4 diodes to switch between both modes.