This commercial transistor radio was manufactured by RCA in the 1960s. The circuit has only 4 transistors and is powered by a voltage of 9 V with an audio power of 20mW.
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....