A Joule thief circuit creates short pulses, that opens and closes a transistor very fast.
The joule thief can be tuned to a frequency of lets say 50khz.
Normally the joule thief is fed by a DC current.
But what if we feed it with pulsed dc, also at 50Khz. And at the same time use this same pulsed dc to create back emf via coil L1
This back emf is stored into a capacitor, that is discharged via a second coil by a joulethief pulse at the of the next DC current pulse.
The joule thief can be tuned to a frequency of lets say 50khz.
Normally the joule thief is fed by a DC current.
But what if we feed it with pulsed dc, also at 50Khz. And at the same time use this same pulsed dc to create back emf via coil L1
This back emf is stored into a capacitor, that is discharged via a second coil by a joulethief pulse at the of the next DC current pulse.