I presume, because your question is not sufficiently clear, that you are talking about a push pull amplifier, where a bifilar or two winding transformer is connected between the FET Drains and the power supply.? Sometimes there is a third winding that serves as the output winding.? Sometimes there is a separate transformer for the output impedance matching.
The Bifilar Transformer serves to bring DC power to the drains and is a Push Pull transformer.? One side will be going positive while th either side is pulled to ground by a conducting MOSFET.
On most class C and D amplifiers the IRF510 is followed by a trifilar or bifilar transformer toroid.? ?Can someone please explain what the function of the this type of transformer is.? (is it for impedance matching?) Google is just not providing me with a easy understandable answer.? ?
