DC=AC current source impedance network - has detector measuring resistor resistance, with output voltage cancelling AC input signal (BE 28.1.80)

摘要

The network has a variable resistor and a DC detector detecting changes in its resistance. Their terminals are connected to diagonals of a bridge circuit. A filter is allocated to the detector and ensures that the current source AC component has no effect on the operation of the detector with an output at a fixed DC potential. This output is connected to the current source, that an AC component at its output cancels the AC signal at the detector (DC) input.