This circuit is for analog TV video signals and was found in the March 1988 issue of Radio Electronics magazine. The circuit uses a Maxim integrated circuit that can still be found.
When the sensor connected to points A and B is activated, removing the ground from the base of Q1...
This circuit has an input impedance of 10 M ohms. We found it in the October 1993 Electronics Now...
This is a typical RF oscillator configuration found in a 1980s documentation. The frequency...