This circuit uses a transistor module, a version that preceded the integrated circuit. The circuit is from a Radio Electronics from May 1958.
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,...