> Dieselhead wrote:

> What would the specs of the diodes need to be to pass up to 25
> amps@ up to 120 V?  Each rated for 25 Amp or more?

Each diode carries the full current, but only half the time.  So
if it is going to have 25 A continuous through it, I would look
for a 30-35 A diode rated for at least 200 V (120 V-RMS is 170 V
peak).

> It just seemed easier to buy a rectifier than to build one.
> But to get 25 amp, I may need to build.

It's easy to build.  Four diodes is all it takes.  Here is a link
to a diagram for a bridge rectifier.
https://en.wikipedia.org/wiki/File:Diode_bridge_smoothing.svg

That diagram is the article:
https://en.wikipedia.org/wiki/Diode_bridge

The advantage to a pre-built bridge is it's easier to wire.  And
occasionally it's cheaper.

As Craig said, there will be a fair amount of heat from these
diodes, so be sure to mount them in a way to dissipate that heat.

--   Philip

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