[R-390] OT: Pass Transistor Question

[Barry]

> Hi
>
> Was the transformer designed for rectifier service?
>
> If it's a filament transformer, be sure to use diodes with  significantly 
> higher voltage ratings than "needed". Filaments don't  much care about a 
> voltage spike as you turn off the switch. In fact  the inductive flyback 
> doesn't generate a voltage spike on a filament.  Rectifier diodes *do* 
> care about voltage spikes....
>
> Bob

Well, that's a good question.  The transformer is a pull from (I believe) a 
medical application that was apparently never used.  It has dual primaries 
for 120/240V input, a single output winding at 19V @ 7.2A, a tap at 11.4V 
@6A and another tap at 13.8V @6A.

Just for the fun of it, I happened across a great deal on 4 stud-mount 
rectifiers that can handle 12A, 300V.  While I didn't really need that much 
"rectifier", I wanted to make it hefty.

Thanks,
Barry