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SOLID_STATE_THERMOMETER

2014-11-20 02:51  
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SOLID_STATE_THERMOMETER
The AM ICL7106 31/2-digit analog-to-digital converter by Harris Semiconductor reads the -2.2-mV/°C change in the junction voltage drop of a BC547 transistor. R9 and R10 provide calibration. The basic chip has a 0- to 199.9-mV range. An LCD display made by Varitronix is used as a readout, The dc input voltage is correlated with the ambient temperature surrounding Q1.