[sdiy] Dual DC-Power from a single AC-supply

JH. jhaible at debitel.net
Sat May 2 17:37:37 CEST 2009

Dual half wave is easy: 2 Diodes, 2 Capacitors.

I use this on all my PCB projects.

(Actually I have 4 diodes, to allow full wave when using two transformer 
secondary windings; it's fully compatible to single transformer winding, 
half wave, where 2 of the diodes are unused.)

Now that circuit that uses two bridges to get two full wave rectified DC 
voltages from a single transformer winding is really new to me!
I'll have to look at it in simulation ... interesting stuff!


----- Original Message ----- 
From: "Paul Schreiber" <synth1 at airmail.net>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Saturday, May 02, 2009 5:23 PM
Subject: Re: [sdiy] Dual DC-Power from a single AC-supply

> No, it's 1/2 wave but the raw DC was fed into a pair of LM78L12/LM79L12
> regulators that have very high ripple rejection so it did not matter.

I also recall (remember, it was 29 years ago!) that you need 3 capacitors to
do this (crap, now I'm going to have to look tonight for the circuit).

Paul S.

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