This circuit was found in a 1965 Electronic Design. The transistors are of the time, but the circuit applies to modern equivalent transistors.
Suggested by General Electric in a 1970 document, this circuit uses a LASCR, or SCR fired by...
This circuit was found in February 1976, Radio Electronics magazine. The circuit is powered by 12 V...
This circuit uses LDRs as sensors and can either detect the incidence of light on the sensor or...