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DIGITAL MISCELLANEOUS TEMPERATURE GAUGE with IN4148

2015-01-18 21:59  
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 DIGITAL MISCELLANEOUS TEMPERATURE GAUGE with IN4148

A diode (IN4148) is used as a temperature sensor. IC2 is an A/D converter with BCD output. A reference voltage set by R7 is applied to the positive input of IC2. As the temperature increases, the voltage across the temperature sensor resistance decreases. This increases the differential input voltage across pins 10 and 11 of IC2. R3 adjusts low calibration. R17 zeros the A/D converter and R7 adjusts high calibration.