Found in a 90’s Radio Electronics, this circuit uses a component from the time, difficult to find today. It generates 12 tones in different octaves.
This configuration with FET and Unijunction can be found elsewhere on this site. The JFET admits...
This circuit, suggested by General Electric, increases the sensitivity of a common multimeter to 1 M /...
Suggested by an American technical documentation, this circuit is polarized in order to provide an...