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Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

Circuits designed by David Johnson, P.E.
Last Updated on: Saturday, May 14, 2011 06:46 AM

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More  Alarm Circuits   Freezer / Frost Alarms

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.

Click on Drawing Below to view PDF version of Schematic

Circuit Freezing Temperature Alarm Circuit designed by David A. Johnson, P.E. (July 7, 2006)

More  Alarm Circuits   Freezer / Frost Alarms

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