Instrument Design
the heart of the matter
The AC Wheatstone Bridge
The Whole System
The thermostatted Box
The thermostatted box OPEN
The breadboards
The interface board - Dr DAQ - very versatile
The whole system with insulating lid in place
NOT USED NOW replaced with LOW COST ELECTRODES
Sq Wave Generator NOW 27.8kHz , see circuits
Long-Tailed Pair replaced with 741 OPAMP differential amplifier see CIRCUITS