This sensitive Japanese mid-wave receiver from the 1960s has an output power of 45 mW and is powered by 3 batteries (4.5 V). The circuit is superheterodyne with an IF of 455 kHz.
This complex circuit with many digital components measures inductances in 6 ranges ranging from 100...
This circuit triggers a photographic flash when the microphone picks up a sound. The SCR can be...
This simple MW radio circuit with two transistors was obtained in an Argentine publication from...