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Thermistor Circuits
Last Updated on: Friday, October 03, 2014 10:38 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, designs for engineers, hobbyists, students & inventors:
A Simple Thermistor Interface to an ADC - Maxim Application Notes / 1753 / Oct-03  (app note added 5/08)
AN685: Thermistors in Single Supply Temperature Sensing Circuits - Microchip Application Note Published 27-Jul-04  (app note added 2/06)

AN850: Inductively Coupled Thermistor - Microchip Application Note Published 21-Jul-02  (app note added 2/06)
AN897: Thermistor Temperature Sensing with MCP6S2X PGA - Microchip Application Note Published 11-Feb-04  (app note added 2/06)
AN897: Thermistor Temperature Sensing with MCP6SX2 PGAs - Microchip Application Note Published 21-Oct-04  (app note added 2/06)
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)
Inductively Coupled Thermistor - Microchip Application Note Published 21-Jul-02  (app note added 2/06)
Pseudologarithmic thermistor signal conditioning spans wide temperature range - 01/06/05 EDN-Design Ideas:.....(design idea added 5/05)
Simple Thermistor Interface to an ADC - Maxim Application Notes / 1753 / Oct-03  (app note added 5/08)
Temperature to period circuit provides linearization of thermistor response - 11/10/05 EDN-Design Ideas:  Highly accurate pulsewidth varies with temperature.....(design idea added 9/08)
Thermistor Preamp - ...(spice design added 02/09)
Thermistor Temperature Sensing with MCP6S2X PGA - Microchip Application Note Published 11-Feb-04  (app note added 2/06)
Thermistor Temperature Sensing with MCP6SX2 PGAs - Microchip Application Note Published 21-Oct-04  (app note added 2/06)
Thermistors in Single Supply Temperature Sensing Circuits - Microchip Application Note Published 27-Jul-04  (app note added 2/06)

 

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