Paolo,
A variable AC transformer (Variac, Powerstat, and many others) is a
pretty basic piece of electrical test equipment, like wire cutters and a
screw driver. It's hard to do any sort of interesting electrical
experimentation without one. They can often be found on eBay
(expensive), or for much less at amateur radio swap meets (Hamfests).
Hamfests are usually the best place to find such useful equipment, if
you can locate one close by.
Your arrangement with the two chained transformers will indeed give you
120 VAC, with the added benefit of mains isolation.
I would check the resistance from A-C and A-D as Neon John recommended.
If there are no surprises, I would apply 120 VAC to pins C- D. If the
meter lights, you are done. If nothing happens, you could apply 120 VAC
to pins B - C.
I'm not sure what the A-C windings do -- they have a 0.`6 ohms ratio to
the B-C pair. With 120 VAC input, that would give you 19 volts, not
line isolated. Not sure what design purpose that would serve. 19 volts
is not a standard input voltage, like 12 or 24 VAC that could
conceivably be used.
Dave
On 2/14/2016 11:42 AM, Paolo Cravero wrote:
I am back with some data.
The panaplex is a Beckman sp-356 indeed (see picture), but I would
rather leave it mounted.
I measured DC resistance of the transformer four input pins, those
that go straight to the card connector and here is the result:
AB 58 ohm
BC 358 ohm
CD 712 ohm
Unfortunately nothing indicates the dual supply trick Dave mentioned.
Now I need to find a way to obtain 120Vac from European mains. Perhaps
a 220/12 chained to 24/220? Needless to say I do not own a variometer
(yet :-) ).
Paolo
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