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 50% duty cycle configuration was found in a Popular Electronics from the 1990s. The operating...
We found this circuit in an early American 80's documentation. We note that the first gate of the...
This circuit was found in the Linear Technology Applications of 1997. The circuit uses common...