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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,
hobbyists, students & inventors:
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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