Building an Isolation Transformer

[RetroHacker]

Also, forgot to mention - you can also run two transformers in parallel for higher current handling. So, if you get two old arcade machine transformers that are the same 1:1, you can wire the primaries in parallel and the secondaries in parallel - but on the secondary, watch out, because they need to be phased the same. If they're backward, you won't get any output!

-Ian

[Old1625]

Originally Posted by RetroHacker

Also, forgot to mention - you can also run two transformers in parallel for higher current handling. So, if you get two old arcade machine transformers that are the same 1:1, you can wire the primaries in parallel and the secondaries in parallel - but on the secondary, watch out, because they need to be phased the same. If they're backward, you won't get any output!

-Ian

Best if the transformers are identical (same make and pt#) to ensure that the voltages are exactly the same. And I would also certainly recommend that the secondaries be phased properly.