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blafioras 12th January 2012 07:17 AM

Toroid transformer help.
Hi guys I need help. I bought this old Toroidal transformers and i know that it is from Kudos Amp SX400 series, and that can operate at 110 and 230 volts, but i do not know what wich cables to uset for 230V. I tried different options with thin wires that cuz i think they are the primary coil, but it is not. I think that big brown and red are the primary as are yellow and blue ground. Correct me if i'm wrong.There is pictures:ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting
Thanks for the help.

dhaen 12th January 2012 07:46 AM

Most dual voltage toroids have twin primaries. Parallel for 115v; series for 230v.
I see your logic for assuming the thin wires should be primaries but often the thin primary wires are joined onto more manageable equipment wire.
I'd look for the 2 windings with the highest measured resistance that are almost identical. Don't be surprised at the low DC resistance. There's a lot of inductance!

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