This radio for the AM band has the traditional superheterodyne configuration with several transistors and integrated audio amplifier circuit. The circuit is from the 70s.
This old circuit uses na operational amplifier not easy to find in these days. But the circuit can be...
Found in a Popular Electronics from 1992, this circuit uses a PLL567 in an audio meter bridge that...
Using a 4046 PLL, which is not very common nowadays, this circuit was found in the October 1994...