This is the circuit of a commercial radio sold in Japan in the 1960s. The IF is 455 kHz, and the supply is made with a voltage of 9 V. The radio receives stations in the medium wave range.
This small experimental transmitter with the CK722 transistors was found in Radio Electronics...
We found this circuit in the old Mullard transistor reference manual from 1960. The circuit is...
This circuit is designed to be used with the infrared transmitter two circuits before this one....