This circuit can use a pendulum sensor. We found this configuration in a 1994 publication. The components used are common and the timing is given by the capacitor C1 which can be changed.
This 1969 Electronics World power supply has 5 V to power digital circuits and a 170 V output for...
Found in a manufacturer documentation from the 90s, this circuit makes use of period components. The...
This RCA circuit provides timing intervals from 5 to 120 seconds. The components are of the time,...