Found in a 303 Circuits from the 90s, this circuit converts signals from the 10 kHz to 150 kHz band to the 4.01 to 4.15 MHz band.
This circuit is from 1985 documentation. The integrated circuit is not very common today, but...
This power supply is protected from shorts in the load. The BD135 must be mounted on a heatsink...
This receiver for the police band, which at the time was 45 MHz, was found in a publication by...