This circuit is from Mullard 1969 documentation. The circuit operates at a relatively high supply voltage and has a 10 Vpp output. The transistors are of the time, but admit equivalents.
MXT1665T-A Family from Microchip Brings the User Experience of Multi-Touch HMI into the VehicleCHANDLER,...
This circuit can use a pendulum sensor. We found this configuration in a 1994 publication. The...
This unusual configuration, due to the component it uses, was found in an old European...