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Simple Temperature Controller

2015-01-10 11:45  
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This temperature controller employs anLM135/235/335temperature sensor, can be used to keep small environment warm or hot. Here is the schematic diagram:

Simple temperature controller circuit schematic diagram

LM311 is used as comparator, to detect if the voltage at sensor pin (the inverting input) goes higher than the reference pin (the non-inverting pin). If this condition is detected, the comparator will switch off the heater driver (BUV26). Practically, after the desired temperature is met, the heater will be oscillating on-off,  trying to keep the voltages at non-inverting input and inverting input equal. [Source: STMicroelectronics Application Note]







 


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