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Thermistor
Circuits Last Updated on:
Wednesday, June 02, 2021 04:16 AM
Circuits Designed by Dave Johnson, P.E. :
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....
Links to electronic circuits, electronic schematics and designs for engineers,
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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.... ….(designed by David A.
Johnson)
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. ….(designed by David A. Johnson)
Copyright January, 1998 -
June, 2021
David A. Johnson All Rights reserved.
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