Quote:
Originally Posted by G8HQP Dave
The extra winding does not work much like a choke. It is essentially a hum-canceller
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And this bit of winding has a resistor in series with it, which is important. Too high a value, or too low a value, and the hum cancellation does not work because it's over-cancelled or under-cancelled.
Of course, if you make this resistance ZERO it won't work anyway, because the reservoir and smoothing capacitors are then effectively across the winding, so would shunt away all your audio!