Found in a 1968 Motorola manual, this DC circuit uses components from the era. The circuit fires in microsecond times. The Q3 transistor must be according to the controlled load.
With each touch on S1, an output of 4017 is activated, this in sequence 3, 2, 4, etc. These...
A touch of the X1 sensor causes the motor to be activated for a time that can be adjusted in P1....
The circuit illustrated in the figure can be used to detect earthquakes or vibrations of...