Found in an old Popular Electronics this circuit appears in other variations on this site and in this section. It uses a 7-segment common anode LED display as an indicator.
This conventional bistable power control circuit using triac was found in the June 1970 Radio...
This circuit produces fast light pulses in na incandescent lamp. Pulse rate is adjusted by P1. The...
This circuit was suggested by Siliconix in a 1980s publication. The circuit uses components from the time...