Re: [EVGRAY] GaryP circuit #1

Body

Hi Warren
 Yes its looking pretty complicated, and long time soldering and testing ...maybe should wait for the boards to be run off in small quantities. G
 I asked Gary which circuit it is of mine that he is basing what he is doing on, and he sent me this circuit, which is not a bucket brigade cap discharge circuit, or a two stage cap discharge circuit, what circuit is he sent is one to adjust pulse width using two hall effects, drifting them closer fo smaller pulse width, further away for longer pulse width. This was meant for peak coil shorting, to get a very narrow pulse width so it doesn't cause reflection during the shorted event of the coil....this is why the mosfets are bidirectional, in that the instead of just one mosfet there are a pair, and the gates and sources connect and switching happens between drain A and drain B....Not included in this circuit Gary sent is addition of very fast diode on each of the 4 mosfets, pointing from source to drain on each so that during switch closure the hyper ringing will circulate and not hit a wall within mosfet in one direction.
 Gary does use the 4421 driver chip, and the 4422 driver chip however, and these are neat things, as you can keep all circuitry the  same,, but just change driver chip around and you can have one switch be NonSWoff and the other NoffSWon........as you will need a switch that is normally ON switches OFF to allow power to pass into cap from the coil, but as soon as the cap discharges to load, that cap wants to be disconnected from the coil (AKA two stage output) so now that switch that allows power to fill cap no suddenly becomes the switch that disconnects the cap from the coil and Gary is doing this in his circuits also using the 4421  and 4422 chips.
 Anyways my advice is when you get your pancake washing machine motors, hooke them up to a regular 96VDC treadmill motor, but a variac on it between your grid and the motor and take that pancake motor up through some rpms....up around 2000 or so go 50rpm segments, put a load on the pancake motor being used as generator, try to find a sweet spot in rpm where motor speeds up during loading and does not brake and cause extra draw....you can do it just by the sound really
 IF you find that then design everything to be spinning that pancake motor at that specific rpm.
 I am on fence about arduinos as I thnk they are a bit slow for OU work, in very immediate switch times but I don't know,,,,,never have programmed one....should be good for bucket brigade or two stage cap filling and dumping however but I don't know.
 Kone