Commutator.
One wire from the negative electrode of the battery can serve both as a power pulse contact and switch contact at the base of the oscillating rod. The Mosfet gate can be connected to the positive contact on the surface of the electro-magnet through a 100k Ohm resistor, and a negative contact from the Mosfet gate can sit just above the negative rod contact so that it turns the Modfet off when it makes contact on the top of the up stroke.
Only one contact on the rod, and one adjustable overhead, both non-magnetic copper. The Mosfet triggers the relay and sends current to the rectifier and capacitor where the higher voltage power is channeled back to the run battery through a diode.
The Relay can be N/O (normally open) or N/C (normally closed) so it doesn't matter which end turns the Mosfet on or off. The one pictured below is a Hybrid and can be easily wired to work either way:
One wire from the negative electrode of the battery can serve both as a power pulse contact and switch contact at the base of the oscillating rod. The Mosfet gate can be connected to the positive contact on the surface of the electro-magnet through a 100k Ohm resistor, and a negative contact from the Mosfet gate can sit just above the negative rod contact so that it turns the Modfet off when it makes contact on the top of the up stroke.
Only one contact on the rod, and one adjustable overhead, both non-magnetic copper. The Mosfet triggers the relay and sends current to the rectifier and capacitor where the higher voltage power is channeled back to the run battery through a diode.
The Relay can be N/O (normally open) or N/C (normally closed) so it doesn't matter which end turns the Mosfet on or off. The one pictured below is a Hybrid and can be easily wired to work either way:
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