This is the circuit of a European commercial amplifier. It was published in Radio Electronics magazine in September 1958 and has a power of 5 watts with good sound quality.
Using LM3909 integrated circuits, this circuit was found in an American documentation from the...
This circuit was found in an ancient American documentation. The components of the time are not...
This circuit with low impedance output and 900k input impedance was found in the October 1993...