[ASK] Rewinding toroid transformer - diyAudio
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Old 3rd June 2008, 02:37 AM   #1
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Join Date: May 2008
Default [ASK] Rewinding toroid transformer

I got three 300VA toroid transformer from my father's junk box with a primary AC 117VAC. Here in my country we use 220VAC main AC. How to calculate windings for primary and secondary to convert this transformer primary to 220VAC and 18V-0-18V secondary?

can someone help me for calculation.

the easiest way is to use a step down transfmormer of course.

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Old 3rd June 2008, 08:34 AM   #2
ECM is offline ECM  United States
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Join Date: Jul 2004
Location: Dubai
Use two of them at the same time and wire the primaries in series.

What are the specs on the transformers? Center tapped? Output voltage?
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Old 3rd June 2008, 01:46 PM   #3
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Join Date: May 2008
sorry it was a 180VA transformer if my calculations correct,

primary is 117VAC, and 2x15VAC secondary 6Amp.
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