This circuit produces sounds of 6 different notes depending on the keys activated. The circuit is from a Radio Electronics from May 1965. The transistor must be equipped with a heat radiator.
This audio oscillator circuit was found in a 1992 publication. In the original article it is...
This low displacement circuit was found in American documentation from the 90s. Operational...
This crystal oscillator uses a common transistor and its frequency depends on the crystal used. We...