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Old 6th May 2007, 11:33 PM   #1
ebenai is offline ebenai  United States
diyAudio Member
Join Date: Jul 2006
Default tranformer wiring problem

I have tried (without success) to wire a Hammond transformer for a LM4780 power supply (Audiosector kit). I have followed the manufacturer's wiring instructions but every time I try the transformer overheats or the fuse blows up. If I understood well, both the primary and secondaries should be wired in paralel. I have attached a diagram.

PRIMARY 2 x 117
VA 225
2 x 22V @ 5.1 A
Attached Images
File Type: jpg hammond trans.jpg (13.7 KB, 79 views)
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Old 7th May 2007, 08:27 AM   #2
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Join Date: Mar 2007
If I understood well, both the primary and secondaries should be wired in paralel.

No, only the primaries... thats if you are using 120 volt outlet. If you are using 240 outlet then u wire the primary in series. The secondaries u hook up to the PSU that comes with the kit. Normally they are marked as in... AC1, AC2 etc.
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Old 7th May 2007, 08:35 AM   #3
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Join Date: Mar 2007
... in other words.

U tie the black, brown wires from trans. to the hot wire 'black' in USA.

Then u tie the white, orange wires from trans to the nuetral 'white' in USA

This is then hooked up in parallel, the primary side. At this stage I would test the voltage at the secondaries. Make sure u have it right.

secondaries DO NOT get hooked together, they are separated to give u the V- and V+ DC through separate bridges.

someone else can explain it better, I am only learning myself!!! Have fun. Good thing on that fuse I suppose
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