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 oscillator was found in the September 1984 issue of Radio Electronics magazine. The frequency is...
This simple 555 biofeedback circuit was found in the December 1983 issue of Radio Electronics...
Found in documentation from the 1980s, this circuit generates signals that can reach a few...