This optical sensor circuit for a robot was found in the March 1986 issue of Radio Electronics magazine. It controls two motors according to signals from optical sensors or couplers.
We found this circuit in a French technical documentation from 1982. The circuit is still current, as...
This circuit from a Radio Electronics from February 1966 uses an LDR as a sensor. The transistor is a...
This circuit is from a 1968 General Electric manual. It produces a pulse of light when fired,...