Pulse Motors: MileHigh OpAmp Comparator Driver Development #2
I’ve added a 0.1 uF bypass cap on the power input leads, and added the mosfet and a car brake light bulb for a test load.
One thing I determined is that the op-amp part of the circuit needs a regulated supply, it can’t simply be run directly off the 12 volt battery powering the load, because the voltage changes, and this screws up the reference voltage that determines the comparator flip point. Perhaps adding a 7812 regulator might cure the problem, especially if the battery supply to the eventual pulse coil is higher than the 12 volts the comparator circuit is designed for.
But with a regulated supply the thing is quite stable and sensitive, very consistent.
Next, some mechanical stuff.