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Cryogenic alarm circuit for cold storage
Source: InternetPublisher:抄写员 Keywords: Alarm circuit BSP LED Updated: 2020/04/03
It is used to indicate the extreme temperature of -18℃ with good effect. The temperature sensing element uses an ordinary
NPN transistor (whichever is used as a be junction), or it can be replaced by a 2AP diode. When the cold storage temperature is within a certain specified range
, the green LED VL] lights up; when it exceeds the lowest temperature in the range, the red LED VL2 lights up and
an alarm sounds.
Adjust the potentiometer RP to change the temperature set value.
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