This sewing machine motor control was found in the December 1997 Electronics Now magazine. The half-wave circuit uses a 106-type SCR.
This circuit, from a 1999 publication, uses an improvised optical coupler with LED or...
This reducer was found in documentation from the 1980s, using transistors of the time. The higher...
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...