This circuit is from a 1967 General Electric SCR manual. The circuit supports other SCRs depending on the power of the controlled load. The control is half wave.
This low voltage lamp flasher can be powered from 12 V supplies. Frequency is adjusted by P1 and...
The transistors in this circuit, found in an American publication in 1975, can be replaced by...
This circuit, from an old publication, can also use modern transistors. Note that the unit is...