This touch switch uses components that have easy-to-obtain current equivalents. The power supply must be isolated and the cable to the sensor must be short.
This circuit is from a 1980s Motorola documentation. The circuit can be made with modern...
Found in 1969 Ferranti documentation, this small font is characterized by its low ripple....
This circuit was found in a 1982 documentation. It uses only one integrated circuit and can be...