Electronics > Beginners

How to connect a toroid ?

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Hextejas:
I have a toroid that i think might be acting up so I wanted to check the primary connection. It connects to a 115v AC wall outlet in the US.
It has 4 wires on the primary side so they need to be combined in order to connect to the 2 wires of the 115v AC.
The wires are blue, violet, grey, and brown.
Presently the blue and violet are connected as are the grey and brown.

Is this correct ?

Circlotron:
Sounds like your toroid has two primary windings that should be connected in parallel for 115V and series for 230V. If you have already connected the toroid to AC power like it is now and nothing unusual happened then all is well. If one of the primary windings was reversed then your toroid will rapidly begin smoking!

cdev:
you can use a low ac voltage from some other transformer (test it first) for testing but keep in mind that even a low voltage can get stepped up quite a bit if its connected as primary to what is usually a low voltage secondary of another transformer that has a 120 or 240 v primary thats unconnected. 1 volts would likely be relatively safe under almost any common step up or step down condition, although I would still use a voltmeter's probes, not my hands, to test the windings. So you could use a voltage divider or something like that to give you a 1 volt transformer testing voltage that you can apply to any set of windings that gives you continuity to see what emerges from the others. Then mark down the ratio of whatever voltages you get to the testing voltage. That and its size should give you a good ballpark idea of what the transformer is meant to do.

ArthurDent:
No guarantee but if the color coding is standard the diagram below might help. It would be a good idea to wire a 40 watt Incandescent bulb in series with the primary when you first power it up to see if your guess is correct. Bright light is bad, no light is good. 

Hextejas:

--- Quote from: ArthurDent on December 11, 2018, 12:43:30 am ---No guarantee but if the color coding is standard the diagram below might help. It would be a good idea to wire a 40 watt Incandescent bulb in series with the primary when you first power it up to see if your guess is correct. Bright light is bad, no light is good.

--- End quote ---
Thank you Arthur for the chart which leads me to ask:
Blu/violet--->soldered together
Grey/brown--->soldered together

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