This traditional configuration found in a Radio Shack document can use 2N2646. More keys can be added, and the power can be supplied with voltages from 9 to 15 V.
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,...