Only for reference this is a circuito f a commercial receiver of the year 1958. The circuit uses coils and transformers hadr to find in our days. The circuit is destinated to receive MW stations.
Found in an American 1980s documentation, this circuit makes use of a sensor of the era uncommon...
This interesting configuration of optical triggering using an oscillator was found in a 90s...
This headphone amplifier has good gain and high input impedance. The circuit is from Electronics Now and...