As I build the drive circuit for the E. Howard Schoolhouse clock I have a question concerning the value of the capacitor needed to store the reverse current generated by the collapsing field of the two advance solenoids. It is a very simple circuit as the coils trigger at 1.5 VDC. This is supplied by a D cell. A NO reed switch detects the passing second hand of a highly accurate Quartz movement. A diode prevents any back EMF but should I utilize a Capacitor beyond the diode or am I over-engineering this??