This circuit turns off a load after an interval of 8 to 80 seconds adjusted on the potentiometer. The circuit is from a Radio Electronics June 1970. The time depends on C1 and can be changed.
Found in an Electronic Design from 1965, this circuit makes use of transistors of the time. The...
PIC16F19197 Microcontroller Family Combines Battery-Friendly LCD Drive with Core Independent...
This circuit was published in Radio Electronics Magazine in February 1958 using the well-known CK722,...