This circuit is from Radio Electronics from March 1985. The circuit uses common components at the time and LEDs as indicators. The power supply is 9V.
Twin-T oscillators can be used to produce sinusoidal signals in the audio track with good...
This circuit generates three outdated signals whose frequency is given by the time the signals...
We found this circuit in American documentation from the 1980s. Transistors can be of general use....