LM392 Dual Comparator Circuit for Accurate Real-Time Temperature Differential Sensing

The discussion centers on designing an accurate real-time temperature differential sensing circuit using the LM392 dual comparator IC, targeting a precision of 0.5°F or better. The project involves comparing two thermistors at a single location to detect minute temperature differences as low as 0.025°F across multiple sensor arrays (up to eight sensors). The temperature measurements cover various surfaces including liquids, air, metals, and skin, with applications in performance efficiency monitoring and early heat-related indicators. Circuit improvements suggested include proper grounding of pin 4 on the LM392, adjusting the nulling potentiometer to provide an intermediate voltage (around half Vcc) for stable output, and considering an output proportional to temperature difference rather than a simple comparator on/off signal. The author seeks clearer, practical explanations of how external components affect the LM392 output to enhance understanding and circuit accuracy within a working range of -5°C to 5°C. Reference material on operational amplifiers was recommended to aid comprehension of the IC’s behavior and design considerations.
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