S-100 power supply transformer

[Chuck Guzis]

On 19 May 2009 at 7:56, dwight elvey wrote:

>  It make no difference what type of rectification is used,
> fullwave bridge or center tap. Watts are watts and there is
> no way around it.

What surprises me is to see that a transformer with 2 secondary 
windings would be operated with the windings in parallel to feed a 
bridge rectifier rather than in series to feed a full-wave center-
tapped arrangement.  Why incur the heat loss of an extra diode pair 
with a bridge, when a simple 2-diode fullwave will do?  With a low-
voltage high-current supply a substantial amount of power is 
dissipated by those diodes.

Another thing that might be considered is a simple switching 
regulator for the output to allow one to adjust the voltage for 
optimimum on-board linear regulator operation.  High-current FETs are 
cheap and the circuit can be driven by a wide variety of choices of 
IC.  I realize that it wouldn't be "vintage", however.

--Chuck