Variac

[Jim Berry]

In the dark recesses of my mind I remember something like that also.
If you hook the two secondary winding up, and you get a spark, you
have chosen the wrong polarization.  (Huh, polarization on something
AC?) Something for someone to play around with.  I will have to get
out some old filament xfrmrs and do some messing around.

Which also reminds me of the time I bought a real nice isolation
xfrmr at a swap meet for a cuple of buxs.  I thought I really got a
good bargain until I got it home.  It was 230 input with 115 out!
Sheesh, no 230 on my bench.

73 Jim K7SLI

>
> back to back xfmrs works, but the regulation stinks...I'm
> not sure why,
> unless magnetizing current in the second one isn't right
> (just a guess).
>
> I used a pair roughly 200 - 250VA xfmrs with 24V-ish
> secondaries back-back
> to isolate an oscilloscope monitoring fluorescent lamp
> start voltage @ 3 kV
> p-p...I only got about 105 V to scope...luckily it was a
> universal switching
> supply 85-260 V input!
>
> Murray
>
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