Electronics > Beginners
How to connect a toroid ?
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StillTrying:
If that's with no load, "2v AC as output" sounds like leakage across an open circuit secondary.
With it all disconnected, you could measure the DC resistances of all the windings to prove it.
Hextejas:

--- Quote from: StillTrying on December 11, 2018, 03:16:10 pm ---If that's with no load, "2v AC as output" sounds like leakage across an open circuit secondary.
With it all disconnected, you could measure the DC resistances of all the windings to prove it.

--- End quote ---
For my education I am trying to reason out how I would measure this. Additionally I didn't know about DC resistance. Are there AC resistances ?
And to measure the resistance where would the probes be placed ? Between leads on the secondary ? Also between leads on the primary ? I am visualizing the picture of a transformer.
Zero999:
It's possible one of the primary windings has gone open circuit. If you connected it to the mains as you described in your first post, which is opposite to schematic posted by ArthurDent, I suspect it's blown. The fact there was no smoke doesn't surprise me as the thermal fuses would have tripped to protect against fire.

Measure the DC resistance of all of the windings with a multimeter. The primary windings should be similar and the secondary much lower. It's difficult to estimate the rough expected values, without knowing the power rating of the transformer. I suspect this is a fairly small transformer? Had it been over several hundred VA, then the circuit breaker in the house would have tripped.
Hextejas:
This is it and it's quite heavy..
500va prolly overkill
Hextejas:

--- Quote from: Hero999 on December 12, 2018, 11:30:55 am ---It's possible one of the primary windings has gone open circuit. If you connected it to the mains as you described in your first post, which is opposite to schematic posted by ArthurDent, I suspect it's blown. The fact there was no smoke doesn't surprise me as the thermal fuses would have tripped to protect against fire.

Measure the DC resistance of all of the windings with a multimeter. The primary windings should be similar and the secondary much lower. It's difficult to estimate the rough expected values, without knowing the power rating of the transformer. I suspect this is a fairly small transformer? Had it been over several hundred VA, then the circuit breaker in the house would have tripped.

--- End quote ---

I really owe y'all an apology.  I misstated in my original post. Since then, I have returned the toroid so I can't double check it but I think that I had it correct according to Arthur's chart.
Sheesh!
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