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Instrument Design 

the heart of the matter

The AC Wheatstone Bridge

AC Bridge scheme Photo 1 whole setup

The Whole System

Photo 2 thermo Box

The thermostatted Box

Thermo Box open

The thermostatted box OPEN

Circuit Boards

The breadboards

Dr DAQ

The interface board - Dr DAQ - very versatile

Whole system + Lid

The whole system with insulating lid in place

Sq Wave Generator NOW 27.8kHz ,      see Electronic Circuits

Long-Tailed Pair (shown here) have been replaced with a 741 OPAMP differential amplifier see CIRCUITS

For a more conventional view of the bridge, see Electronic Circuits