Suggested by a 90’s Radio Electronics, this circuit automatically activates the recording switch of an old tape recorder. It can be adapted for other purposes.
This circuit takes advantage of the noise generated at the junction of a zener diode of any type....
This low-frequency oscillator was found in a 1963 documentation. Capacitors determine frequency. The...
This configuration with FET and Unijunction can be found elsewhere on this site. The JFET admits...