2n3055 Flyback Transformer Driver for Beginners: 10 Steps Mount the Transistor Onto the Heat Sink. Mount the transistor onto the heat sink. The heatsink is Preparing the Flyback. Using some enamelled magnet wire wind two coils around the core of the Putting the Circuit Together. Connect all of the components together as shown in the images Check Everything. Check to make sure that your circuit is connected up correctly. You can use a See all full list on instructables Flyback Transformer Driver - circuit diagrams, schematics Flyback Transformer Driver. Circuit diagram. General Description and circuit operation: This is an efficient flyback driver for modern cylindrical rectified television flybacks. Many sites doesn't provide circuits driving these transformers, they simply say that they are bad.