This control circuit was found in a Radio Electronics from May 1965. The circuit switches a recorder from an external command signal.
This circuit uses a small photocell to trigger an auxiliary flash. The circuit is from a 1991 PE...
A touch of the X1 sensor causes the motor to be activated for a time that can be adjusted in P1....
This circuit allows the division of the frequency generated by an oscillator with the 4069 by two,...