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Help me with this toroid!
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Old 22nd July 2017, 05:21 AM   #1
Hikari1 is offline Hikari1  United States
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Default Help me with this toroid!

Just bought this transformer off ebay. Plan on using it for an F5T build.

I just realized I have no idea what wire are what on the primary side. This is a 0/110/117 transformer. I need 117.

I know which are the secondaries (brown/blue, red/green) but the primaries have me confused.

I've got 6 wires of on the primary side which makes sense. But I don't know which ones are 0 and which are 117. Two of the primary wires (brown and yellow)have double runs of wire in them.

The datasheet does not match my wire colors. Perhaps this transformer is a custom job.

Anyone know?
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Old 22nd July 2017, 07:43 AM   #2
pchw is offline pchw  United States
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Help me with this toroid!
You can use a DMM to measure the primary to find out 2 groups of 3 wires that are connected.
From each group, measure the resistances of all combinations of 2. The common color of the 2 highest resistance is the 0. Supposedly, the wire with the highest resistance to the 0 is the 117.

If you have a 6vac transformer like those for the vacuum tubes, you can feed the 6V AC to one the secondary pair and measure the VAC on the primary and deduct the primary using similar logic as above.
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Old 22nd July 2017, 09:19 AM   #3
AndrewT is offline AndrewT  Scotland
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find which tappings are on which primary winding. Label them A or B for the two windings.

Then measure the resistance of the three alternatives A1 to A2, A1 to A3 and A2 to A3.
Find the highest resistance. That is the 0-117Vac tapping.
Find the lowest resistance. That is the 110-117Vac tapping.
Find the middle resistance. That is the 0-110Vac tapping.
Insulate the 110Vac tapping.
I suggest you insert each tapping into a separate receptacle of an insulated terminal block (safer with no loose wires flailing about).

Connect the 0Vac to Neutral
Connect the 117Vac to Live via a Mains Bulb Tester.
Switch on. You can now measure the voltages between all the other tappings.
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Old 22nd July 2017, 09:37 AM   #4
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Help me with this toroid!
maybe this will help
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Old 23rd July 2017, 12:17 AM   #5
Hikari1 is offline Hikari1  United States
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Thanks guys. I think I figured it out.

The primary leads with two wires (yellow and brown) are "0". They are the two ends of the 110 and 117 taps. The two leads have no continuity between them although they are in the same insulation. The black and orange are the 117 taps.
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Old 23rd July 2017, 07:32 AM   #6
AndrewT is offline AndrewT  Scotland
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Use a Mains Bulb Tester to power ON.
And use it every time you modify anything in your project.
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Old 24th July 2017, 02:43 AM   #7
Hikari1 is offline Hikari1  United States
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I tested with a bulb tester. Bulb did not light. I have 30.8v AC across each secondary pair. This is a 24v transformer. This seems ok? This voltage was taken with the bulb tester in place although Iam not sure it matters.
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Old 24th July 2017, 04:01 AM   #8
gary s is offline gary s  Australia
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That secondary voltage is too high if the secondaries are supposed to be 24VAC with a nominal 117VAC primary supply voltage. It sounds to me as though you have connected the incoming AC voltage which is probably 120VAC or even slightly higher to the 100VAC primary tap.

Contact the manufacturer with the specific part number of the toroid for the correct primary connections if in doubt. It looks to me as though the details you show in your first post have different wire colours on the dual primaries to what is actually on the toroid you have.
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Old 24th July 2017, 05:21 AM   #9
Hikari1 is offline Hikari1  United States
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Ok, tapped it a different way and I have 26.2v (24v transformer).

That sound better? Still not sure which primary is 0 and which is live but I guess it doesn't really matter.
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Old 24th July 2017, 05:26 AM   #10
gary s is offline gary s  Australia
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That is more like it, the sec volts will drop a bit based on the regulation % of the toroid once you load it.
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