This 6-transistor Japanese commercial radio was manufactured in the 1960s. The receiver is a super heterodyne type with germanium transistors and is powered by a 9 V voltage.
This simple circuit allows the monitoring of both audio and RF signals. With the switch in one...
This circuit was found in documentation from the 1980s. The integrated circuit used is uncommon today...
With a light pulse on the Q1 sensor the circuit turns on and locks. To switch off, a light pulse...