This circuit was suggested by Analog Devices in 1980s documentation. The circuit has a grounded bias and sensor.
This circuit comes from an English publication of 1976, consisting of an experimental touch key....
With a mains-rated transformer and 1:1 winding this benchtop circuit was found in the January 1995...
This power source was found in a 1969’ Electronics World. The version is too sophisticated by the current it...