Circuit - Freezer / Frost Alarms Electronic Circuits Designed by David A. Johnson, P.E.

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Freezer / Frost Circuits

Circuits designed by David Johnson, P.E.
Last Updated on: Monday, March 08, 2010 06:32 AM

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Freezing Temperature Alarm
This circuit turns on a beeper whenever the outside air temperature is less 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.

Freezer Over-Temperature Alarm
This electronic hobby circuit below is designed to activate a beeper alarm, whenever the outside air temperature is below 0 degrees C (32F). A 9v battery powers the hobby circuit. The average 9ua current is so low that the battery should last for many years....

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