Hi Gang,

I have a large and heavy power supply transformer
that is part of a high current power supply project
that was featured in 73 magazine back in 1973. It
was started by a ham radio operator and was never
finished. I am going to finish it, if I can. I am
trying to identify the transformer leads. This is
for a 12 volt, 40 to 60 amp output. Here are the markings:

This transformer was made by ADC and is marked 541-010 REV H.
There is a marking on it that says 3-19470 and what I think
is a date code of 7438. There are terminal connections on one
side that are numbered 1 - 6. On the other side the connections
are numbered 7 - 14. I need to know the connection scheme for
this transformer so I can put it to use. I contacted who I
thought was the manufacturer "ADC" for information, and that
did not help.

I don't have the issue of 73 magazine, and I don't even know
if this is the same transformer that may have been part of the
construction article. I can take pictures and post them if that
might help.

Anybody have any ideas?

Thanks a lot.

Mike

pinpassion wrote:
This transformer was made by ADC and is marked 541-010 REV H.
There is a marking on it that says 3-19470 and what I think
is a date code of 7438. There are terminal connections on one
side that are numbered 1 - 6. On the other side the connections
are numbered 7 - 14. I need to know the connection scheme for
this transformer so I can put it to use. I contacted who I
thought was the manufacturer "ADC" for information, and that
did not help.

I don't have the issue of 73 magazine, and I don't even know
if this is the same transformer that may have been part of the
construction article. I can take pictures and post them if that
might help.

Anybody have any ideas?

I think that with an AC voltmeter and a 6V filament transformer, you
can apply 6V to each winding in turn and check the voltage on the
other windings, and with an afternoon's work you can figure out what
the primary and secondary winding ratios are.

First get an ohmmeter and find out which terminals connect to which
others. You'll find a bunch of them are unused. You'll find probably
several pairs of pins that connect to each other but not to any other
pins. Those are individual windings. You may find a group of three
or more pins that connect together; these are tapped windings and by
looking at the resistance you should be able to figure out which pins
are the edges and which ones are taps and what order the taps are in.

As long as you know this is a 60 Hz power transformer and there is nothing
too weird about it, you should be good to go.

Apply 6V to one winding... if you find 6V on an adjacent winding, you
know they are 1:1. If you find 60V, you have a 1:10 voltage ratio.

Incidentally, I need an impedance protected transformer that will put
out about 40A with taps from, say about 25V to 40V, in order to run
a projection arc. If anybody has one on the east coast that they don't
want, I'd love to know.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."