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Freezer / Frost Alarms Circuits
Designed by David A. Johnson, P.E.
Last Updated on:
Monday, April 21, 2008 04:19 AM
Master Category List - Dave's Circuits
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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.
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- Freezer Over-Temperature Alarm
This circuit turns on a beeper whenever the inside temperature of a freezer is greater then 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.
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More Freezer / Frost Alarms Circuits
Master Category List - Dave's Circuits
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