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.
We found this circuit in an American publication from 1977. The circuit drives two LEDs according to...
We found this circuit in a 1972 RCA technical documentation. The comparator can be any type and C1...
Similar circuits can be found on this site. This is from an 80's American documentation. The...