This commercial radio for the AM band was sold in Japan in the 1960s. The circuit has an IF of 455 kHz and is powered by batteries. The push-pull output gives a good audio power.
This is the circuit that decodes the signals from the CIR3059. The adjustment of each frequency is made in...
This circuit measures the strength of audio signals. We found it in an American publication from...
This circuit is from a 1974 Ferranti transistor manual. The circuit is analog, and the components used...