This circuit comes from a 1966 NASA documentation. The circuit makes use of discrete components and is suitable for generate 455 kHz IF signals.
Obtained in a 90s Radio Electronics, this configuration appears with variations in other points of...
This detector uses an unusual sensor today. The circuit is from an 80s documentation. Its...
This alarm with the 555 integrated circuit is from an EDN from the 90s. The circuit directly...