Found in a 1968 US publication, this circuit produces a delayed pulse with the negative transition of the input signal. The circuit can be used as a shield.
This simple transistor tester circuit was found in the February 1968 issue of Radio Electronics magazine....
A touch of the X1 sensor causes the motor to be activated for a time that can be adjusted in P1....
This is a traditional flasher configuration with two neon lamps. The frequency is given by the 100 nF...