While the normal PWM circuits have been assessed as operating at about 300% of the Faraday assumed maximum efficiency, further experimentation has shown that the inductors used by Stanley Meyer form a very important role in raising the operating efficiency still higher.
We introduced recently two inductors in the PWM circuit, each wound with 100 turns of 22SWG (21AWG) enamelled copper wire on a 9mm diameter ferrite rod 25mm long.
This is the improved PWM circuit.