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.
The configuration shown is suggested by National Semiconductor in its 1994 Linear Applications Handbook....
This simple receiver, which requires a good antenna and grounding, was found in an Argentine...
This circuit was found in an Electronic Design from the 90s. Operational amplifiers admit modern...