We found this circuit with duty cycle adjustment in the May 1988 Radio Electronics magazine. The source must be symmetrical, and the frequency given by R3 and C1.
This circuit was found in General Electric documentation from the 1980s. The circuit uses couplers...
Designed for the audio track, this circuit was found in a Popular Electronics from the 90's. Other...
The sound of this experimental musical instrument is produced by the movement of the hand in front...