Found in a 1966 American publication, this circuit invert the phase of a low frequency signal. The circuit has an intensity adjustment.
This circuit appears in several versions in publications of the time and can be modified by...
This configuration with FET and Unijunction can be found elsewhere on this site. The JFET admits...
We found this circuit in a Popular Electronics from the 90s. It operates at a frequency of 15 kHz....