This circuit with the PA7601 was found in a 1967 Philco-Ford documentation. The circuit has a pass band from 45 to 120 MHz.
The purpose of this interesting circuit found in a 1977 documentation is to complete the last...
The optocoupler in the figure uses common transistors and a phototransistor to drive a sensitive relay...
The coil consists of 100 turns of wire 28 in a wooden or PVC tube from 2 cm to 2.5 cm in diameter with...