[ASK] Rewinding toroid transformer

casiomax · 3rd June 2008, 02:37 AM

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.

thanks

ECM · 3rd June 2008, 08:34 AM

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?

casiomax · 3rd June 2008, 01:46 PM

sorry it was a 180VA transformer if my calculations correct,

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

3rd June 2008, 02:37 AM	#1
casiomax diyAudio Member Join Date: May 2008	[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. thanks

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3rd June 2008, 08:34 AM	#2
ECM diyAudio Member Join Date: Jul 2004 Location: Cyprus	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?

3rd June 2008, 01:46 PM	#3
casiomax diyAudio Member 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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