PhysicsProf Steven E. Jones circuit shows 8x overunity ?

[MarkE]

Synchro1 it is all very normal very under unity behavior.  Energy transfers from the capacitor to the coil, and if he is not fast enough back to the capacitor from the coil in an ordinary ringing tank.  The stored energy is ultimately dissipated primarily in the circuit resistance.  A small fraction of the energy ends up stored in the turned domains of the soft magnetic material.

[synchro1]

Synchro1 it is all very normal underunity behavior.

Says you! If the keeper were on a rotor arm, the rotor inertia added to the pulse and fly back recovery equilibrium would put it way over the top as a pulse motor, and pehaps be turned into a self runner.

[d3x0r]

Why don't you use a pair of diodes?  Charge the capacitor, disconnect the supply, then connect the coil to the capacitor through a series diode with a flyback diode across the coil?  No flicking will be necessary.

I am not sure what it is that you find unusual about any of this.  People have made keepers with lapped surfaces for many years.

was thinking that; if the diodes were kept in the circuit as a constant load, should be able to attach a second, discharged cap and measure how much energy comes back out when separated... minus the losses in the diodes of course... but needs the diodes otherwise it will just dump back out into the coil...


The other thing that wasn't really addressed the the resulting negative voltage in the cap; this is because the coil is sort of like a body with momentum; moreso on a ferrite core... that is once the current starts, it continues until it is exhausted/builds opposite charge... so starting a current from a positive voltage will continue until an equal negative voltage is built up in the source... (minus losses in the wire, which is the ring-down effect of a resonant circuit)...

[MarkE]

Beyond the intended circuit function, there is the matter of protecting the capacitor.  Electrolytic capacitors get very unhappy if reverse biased.  More than a volt or two can cause them to fail.  The two diode arrangement allows the stored energy in the inductor to safely recirculate without reverse biasing the capacitor.  The capacitor will discharge down to the forward bias cut  off of the horizontal diode and then the inductor voltage will drop by Vfw latching the vertical diode on until the energy in the magnetic field dissipates, or the capacitor is charged up and connected again.

[MarkE]

Says you! If the keeper were on a rotor arm, the rotor inertia added to the pulse and fly back recovery equilibrium would put it way over the top as a pulse motor, and pehaps be turned into a self runner.

Synchro1 you can fantasize about such things.  If you believe such fantasies, then you should build a test vehicle and try it out.  Or if you prefer to cut to the chase you may observe that the capacitor gets charged up with real energy.  The energy gets dissipated.  A tiny amount of the energy remains in the iron.  In the case of the soft ferrite "U" and "I" pieces that Steven Jones is using that amount is extremely small.  Negligible mechanical work is performed each cycle.  Aside from a very minute amount of radiation, no external electrical work is done either.