19 Dec 2006 23:42 Negative rail PSU with LM723 and 2n3771
Hi all,
I need a linear power supply that regulates the negative rail(-12V) using NPN power transistors like 2N3771, 2N3772, MJE802 and so on, a PNP driver (TIP32 or equivalent) and LM723(or equivalent) as the voltage regulator.
Joined: 05 Oct 2004 Posts: 6346 Helped: 1505 Location: West Coast
20 Dec 2006 0:28 Re: Negative rail PSU with LM723 and 2n3771
One option is to configure LM723 regulator and external power transistors in "normal" positive voltage regulator and use the output (+) rail as "new" 0V and the "former" GND rail as "new" -12V output .. see picture below ..
http://www.spaennare.se/psupply.html
Regards,
IanP
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