Regulated resistance bridge circuit with stabilised diagonal voltage - has differential operational amplifier controlling gate and source path of FET via RC element

摘要

A regulated resistance bridge circuit produces an output signal only for imbalances occurring more rapidly than the controller can balance out. It employs stabilisation of the bridge diagonal voltage. This enables bridge elements with slow variations with time to be used as indicators. T'e bridge diagonal by an element having a time constant. The voltage is applied to the differential inputs of an operational amplifier whose output controlling the gate-source path of a f.e.t. via an RC element. The transistor is in series with one bridge resistance.