As you can see, the trick is to place the reed switch so that it runs along the length of the solenoid coil and so is
located in the coil's magnetic field. This couples the coil's magnetic field to the reed switch as well as the
magnetic field of the passing rotor magnet. This provides a magnetic feedback and turns the reed switch into an
oscillator. So when the magnet passes the reed oscillates with the coil's field and causes very many pulses,
typically 20 to 50 pulses per magnet pass. Amazingly, unlike the clamping diodes in the SSG, this is not wasteful.
This reed switch oscillation actually reduces the input current. Instead of the reed remaining closed for the whole
of the pulse duration, it switches on and off and so, less input power is drawn from the driving battery. I run the
motor so that when the coil is energised, the magnet is attracted to the coil. Here is a trace across the charging
battery: