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Last Updated on: Friday, November 17, 2017 06:32 AM

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More  Alarm Circuits   Freezer / Frost Alarms
Micro Power Circuits   Temperature Sensors
Temperature Control Circuits      Themocoupler    Thermistor

Freezer Over-Temperature Alarm


This circuit turns on a beeper whenever the inside temperature of a freezer is greater than zero degrees Centigrade.  The circuit draws only a few microamps from a 9 volt battery.

It uses a glass bead thermistor accurate to 1 degree C.

Click on Drawing Below to view PDF version of Schematic


More  Alarm Circuits   Freezer / Frost Alarms
Micro Power Circuits   Temperature Sensors
Temperature Control Circuits      Themocoupler    Thermistor

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