This control for 1/15 HP motors with 5,000 rpm for 115 V power grid was suggested by a Motorola circuit manual from 1968. The SCR supports more modern equivalents.
This circuit appears in similar versions on this site. This is from a Popular Electronics from the 80's. The...
This two-transistor delay circuit from the 1960s was found in documentation from the time....
This circuit operates with signals from 150 kHz to 1 MHz and makes use of a known NAND CMOS gate....