Feature:Size: 5.8*3.7cm Power supply voltage: DC 5VFunction introduction:RP1, R1, R2, R3 and RT in the circuit form a temperature measuring bridge. When the temperature is below the preset temperature, the potential of pin 2 of UA741 is higher than that of pin 3, pin 6 of 741 outputs a low level, LED1 is on, and the buzzer does not sound, that is, no alarm. When the temperature rises, the resistance value of RT drops 741. The voltage of pin 2 drops with it. When the voltage of pin 2 is lower than the voltage of pin 3, pin 6 outputs a high level and starts to alarm. LED1 goes outPackage includes:1 x DIY KIT
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