This Japanese radio is from the 60s, presenting excellent sensitivity and an output power of 100mW with 6 V power from ordinary batteries. The circuit is of the superheterodyne type.
In the circuit of the figure, when pressing S1 the sound varies according to the value of R2 and...
This receiver for the police band, which at the time was 45 MHz, was found in a publication by...
This is the receiver circuit for the PFM (pulse rate modulation) transmitter of the previous...