Radio with amplifier (CB20486E)

We found this circuit in a publication of 1991. The audio amplifier is an operational that admits equivalent.

Square Power Generator (CB15143E)
We found this oscillator that can supply up to 3 A of output in the 1982 SGS linear integrated circuit...
1 to 5 W amplifier TDA1011 (CB15975E)
This amplifier is specifically designed for portable radio and recorders with a 4 ohms load....
Parallel Port Interface for PC (NI021E)
This application is not modern since few computers have parallel ports. But you can use this...