Identify High Current Power Supply Transformer

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.


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For help on figuring out unknown transformers:

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You might ask over in one of the newsgroups (maybe .equipment or .homebrew) - somebody over there might at least be able to give you the info from the magazine article.

Matt Roberds

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1) Ohm the leads out to identify windings and center-taps. 2) Use a 40 watt light bulb in series with thehighest resistance winding to (partly) energize the transformer. Measure the voltage across that "input" winding, and then of all of the other windings (write the readings down). This gives you the volrtage ratios between the windings, and will give you a clue as to which one was to be the 115VAC primary.
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Robert Baer

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