Wind 10 or 20 winds.
Sand 1-2 mm wire and measure AC. Don't cut yet.
Cumpute winds needed for Your Voltage & also check if AC mains Voltage is within spec.
Now wind computed first Wind.
Measure AC again to check for correct Voltage or wind / unwind a few turns.
Cut the wire and this will be your center tap.
Twist the starting wire and start winding the second wind.
Make sure windings follow the same direction as the Primary winding.
Sand 1-2 mm wire and measure AC. Don't cut yet.
Cumpute winds needed for Your Voltage & also check if AC mains Voltage is within spec.
Now wind computed first Wind.
Measure AC again to check for correct Voltage or wind / unwind a few turns.
Cut the wire and this will be your center tap.
Twist the starting wire and start winding the second wind.
Make sure windings follow the same direction as the Primary winding.
Not quite. Using two wires wound together is right. Let's call the four wire ends beginning 1 and beginning 2 and end 1 and end 2. After they are wound connect beginning 2 and end 1 as your center tap. You'll know it's right if you measure 12V between beginning 1 and the center tap and 12V between center tap and end 2 and 24V between beginning 1 and end 2.
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