Schematic for 1920's A,B,C Power Supply?

Schematic for 1920's A,B,C Power Supply?

Post by AIKEN DA » Tue, 23 Dec 2003 12:31:43



Does anyone know of an on-line schematic for a power supply that will handle
typical A, B & C voltages for a 1920's radio? ( for RCA AR-812)
I see an assembled unit on line that looks pretty nice but I wondered if I had
to spend the $149 or could I build one for lots less? The kit from AES doesn't
have the C supply, I'll need 3 to 3.3 volts for the filaments and I'd rather
not use batteries for a battery eliminator.

Thanks
Dave

 
 
 

Schematic for 1920's A,B,C Power Supply?

Post by Syl's Old Radio » Tue, 23 Dec 2003 13:38:40




Quote:
> Does anyone know of an on-line schematic for a power supply that will
handle
> typical A, B & C voltages for a 1920's radio? ( for RCA AR-812)
> I see an assembled unit on line that looks pretty nice but I wondered if I
had
> to spend the $149 or could I build one for lots less? The kit from AES
doesn't
> have the C supply, I'll need 3 to 3.3 volts for the filaments and I'd
rather
> not use batteries for a battery eliminator.

Here's one that look a bit better than AES's:
http://www.ussc.com/~turner/ak20c_ps.gif

There are tons of schematics out there. The one selling at 149$ is a simple
zener strings and LM317 with no pass transistors, which means drawing
1.5 amp is looking for trouble...You can build it for way much less that
the asked for price. I say you can build a decent one for 40$...

Syl