Joule Thief

[Dave45]

Dave this latest drawing of yours does show correct electron flow convention current.

Im learning, Iv found through testing my former idea's were wrong.
But that being said we are missing something or we would have free energy and I will continue until I understand.
The pnp diode really had me stumped but I now understand so the exercises are not futile.
Hope you dont mind if I continue, I appreciate your feedback.

dave

So what happens if both pnp transistors turn on and off at the same time, does current continue to circulate in the coil? during the off cycle.

[MarkE]

Im learning, Iv found through testing my former idea's were wrong.
But that being said we are missing something or we would have free energy and I will continue until I understand.
The pnp diode really had me stumped but I now understand so the exercises are not futile.
Hope you dont mind if I continue, I appreciate your feedback.

dave

So what happens if both pnp transistors turn on and off at the same time, does current continue to circulate in the coil? during the off cycle.

Yes as it must.  The second transistor adds complexity but no change to the function.  If you had two diodes, one from the bottom transistor back to the positive sid eof the battery, and the other from the to transistor to the negative side, then when the transistors turn off the coil will discharge into the battery instead of just recirculating.  The current decay will be much faster.

[Dave45]

Wouldnt this allow the magnetic field to collapse......oscillate.

[Dave45]

Electron path

[MarkE]

Wouldnt this allow the magnetic field to collapse......oscillate.

The cirucit looks like it will oscillate.  The right hand section will develop voltages that depend on the relationship between the left hand oscillation frequency and the resonant frequency of the transformer primary inductance and the capacitor across it.