This circuit was obtained from the November 1989 issue of Radio Electronics magazine. The circuit is for motors up to about 1.5 A.
The SCR used in this 80's circuit depends on the load. The control is half wave and instead of the neon...
Found in a 1965 Motorola documentation this circuit drives magnetic-type fuel pumps found in cars...
This circuit has a thermal chamber that acts as a stabilizer, compensating for the ambient...