DC MILLIVOLTAGE TRANSDUCER(DC CURRENT WITH SHUNT)

The dc millivoltage is a signal conditioning circuit which accepts lowlevel inputs from a variety of transducers to control a standard signal. The measured value is first converted to a dc voltage, amplified by an operational amplifier and then chopped to produce a square wave of amplitued proportional to the dc voltage. This is photo coupled to a second chopper circuit which converts the square wave back to dc voltage. This is then filtered and amplified to produce a load independent dc output proportional to measured input.