Thermo Box open
Circuit Boards

Instrument Design 

the heart of the matter

The AC Wheatstone Bridge

for simple measurement of enzyme activity by conductivity

AC Bridge scheme
Photo 1 whole setup

The Whole System

Photo 2 thermo Box

The thermostatted Box

The thermostatted box OPEN

The breadboards


The interface board - Dr DAQ - very versatile

The whole system with insulating lid in place


Whole system + Lid

Sq Wave Generator NOW 27.8kHz ,      


see circuits

Long-Tailed Pair replaced with 741 OPAMP differential amplifier see CIRCUITS