This circuit can be used as a shield for touch control. The circuit can use any common FET like the BF245 and should never be powered by a source without a transformer.
This circuit uses one of the first commercial transistors, availble in 1958, year of the...
The circuit presented is from 1994 and can be developed with more modern operators. We found the...
The operational amplifier used in this circuit from a documentation from the 70s is no longer easy...