Temperature Controller

  
A thermistor (RI) is compared with a reference (R2) in a Wheatstone-bridge circuit. Comparator Ul`s output goes high
Temperature Controller - schematic

, which triggers U2. U2 is a delay of about 25 s. After 15 s, LED1 lights, U3 actuates, triac TRl triggers, and turns on a hot water pump. This system was used with a hot-water heater.




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