Found in July 1975, Radio Electronics magazine this circuit can use any operating circuit, including the 741. The circuit must use a symmetrical power source.
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...