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Discovering Toroid Secondary Voltages
Discovering Toroid Secondary Voltages
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Old 11th March 2008, 09:38 PM   #1
vdi_nenna is online now vdi_nenna  United States
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Question Discovering Toroid Secondary Voltages

I have 3 Amveco toroids, but Amveco won't tell me what the wire color codes are because these toroids were custom made and do not disclosed this info to 3rd parties.

What's a safe way to test toroid transformer secondaries not connected to a circuit? It has several secondary taps. It can be wired as 28v or 15v at 4.67 amps.

I want to wire it for low volts and high current, but not sure what wire goes where.

Thanks,

Vince
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Old 11th March 2008, 10:38 PM   #2
jnb is offline jnb  Australia
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First, use your ohmmeter to find what's connected to what, and draw a wiring diagram.

Then, run a low voltage to the primaries. You can use a spare amp to feed it, for example 60Hz 12V (or whatever is one tenth of your outlet voltage), then multiply your secondary voltage readings by 10.
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Old 11th March 2008, 10:42 PM   #3
leadbelly is online now leadbelly  Canada
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Discovering Toroid Secondary Voltages
Default Re: Discovering Toroid Secondary Voltages

Quote:
Originally posted by vdi_nenna
I want to wire it for low volts and high current, but not sure what wire goes where.
Remember that only identical secondaries can (effectively) be wired in parallel.
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Old 11th March 2008, 11:57 PM   #4
vdi_nenna is online now vdi_nenna  United States
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Quote:
Remember that only identical secondaries can (effectively) be wired in parallel.
That's what I'm worried about.
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Old 12th March 2008, 02:08 AM   #5
TheMG is offline TheMG  Canada
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I usually use a function generator. Fairly low current output, so no danger at all. Might not be the best for very large toroids though.

Failing that (as I don't always have access to a function generator), I just do what jnb said and use an amp to power it with a 60Hz test tone.
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