[Milsurplus] LV Supply...

[Richard Brunner]

Rick Brashear wrote:
> I would like to ask a little advice about my low voltage supply.  I have 
> a capable transformer with very good filtering capacitors and a high 
> current diode bridge.  My problem is, the transformer puts out about 16 
> vac and by the time I get it rectified and run through the filter 
> capacitors I am facing about 22.5 no load dc volts.  I am using it for a 
> few different projects and experiments one of which is to operate a 12 
> volt dynamotor. .....

Electronic regulation is easy.  Parallel enough power transistors to 
handle the current, or look for those high-power Darlington block 
transistors that show up in the flea markets.  It works for me - I have 
a 28 volt supply that regulates within 10 mv, (it's hard to measure) 
0-30 amps.  With heavier rectifiers it would go higher.

Richard Brunner, AA1P