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.
Suitable for clandestine listening and in SMD assembly, this circuit was found in the Radio...
This circuit was found in an ancient American documentation. The transformer is the type used in...
This circuit is from a current regulator up to 1 A, ie a constant current source. The LM320...