Adrian C wrote in message
...
N_Cook wrote:

Looks like a regular linear ps to me except for the transformer being
about
4 times the size necessary for a preamp and relays - more superfluous
weight.
Pair of 3300uF caps , 78M18,79M18, 5V reg , no chokes, no mu-metal or
anything noticeably odd but, at least, no gold plating.

I was wrong in calling it a "very clean power supply". I should have
said "it has the effect of a very clean power supply"....

Have a look around the preamp section. As from the link I gave (from
google), it's not a regulator but an "active filter".

Quote "tracks input voltage as changed by variations in line voltage and
load, and takes out some AC. That may be useful under some special
circumstances. In the tube days, this was done using a large choke,
that's in a way what this circuit simulates."

FWIW I tried a patent search. Got nothing.

--
Adrian C

There are 2SD2037 and 2SB1357 ,probably as pass transistors downstream of
the 18V regulators, using some of the headroom to drop to +/- slightly lower
rails and a load of little electros, which doesn't strike me as particularly
groundbreaking, let alone simulating a battery.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/