Found in an old Xicor documentation, this circuit makes use of an X9241, which contains four digitally controlled analog potentiometers.
This small blocking oscillator for approximately 1000 Hz was found in an American documentation from the...
This circuit for activating a relay was found in a Radio Electronics magazine from August 1962. The...
In this circuit found in the December 1972 Radio Electronics magazine. R can be from 1k to 22k,...