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Thermocoupler Circuits
Last Updated on: Monday, January 01, 2018 04:02 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:
1-Wire ThermocoupleThis article describes a method of measuring temperatures using conventional thermocouples that are directly digitized at the cold junction. The transducer is based on a recently introduced multifunction chip that communicates with a PC (or microcontroller)....(App Note added 08/08/08)

Got Designs?
Please eMail
if you want me to link to and/or post your original design Thanks.

A Thermoelectric Cooler Temperature Controller for Fiber Optic LasersAN89 Linear Technology This application note presents circuitry for maintaining 0.01°C temperature control of fiber optic lasers over wide ambient range variations. The circuitry also features high efficiency power delivery, compact size and low noise. Detailed descriptions of circuitry and results are given with special emphasis on rmal loop optimization. An appended....
Amplifier Thermal Protection(circuit / schematic design added 6/06)
AN-225: IC Temperature Sensor Provides Thermocouple Cold-Junction Compensation National Semiconductor Application Note  (App Note added 2/06)
AN-274: Taking the Uncertainty Out of Thermocouple Temperature Measurement AN-274 Analog Devices Application Notes  (App Note added 2/06)
AN-369: Thermocouple Signal Conditioning using the AD594/AD595AN-369 Analog Devices Application Notes  (App Note added 2/06)  This application note reviews rmocouple basics and illustrates circuit designs for rmocouple signal conditioning using  AD594/AD595.
AN844: Simplified Thermocouple Interfaces and Picmicro® McusMicrochip Application Note Published 21-Jul-02  (App Note added 6/06)
Apex-AN11 Thermal Techniques1/2005, AN11UREVD : 359 Kb (Apex App Note added 08/08/08)
Circuit provides cold junction compensation11/28/02 EDN-Design Ideas :   The accuracy of any circuit or system that uses a thermocouple to determine the temperature of a process is limited by the accuracy of the method used to perform cold-junction compensation. In a thermocouple measurement, two wires of dissimilar metal join together at the "hot," or measurement, junction.....(design idea added 10/03)
DPPs Make Nonvolatile MicroVolt DAC10/31/02 EDN-Design Ideas :  The availability of a seemingly limitless variety of monolithic DAC chips makes it easy to implement most digital-to-analog-conversion applications with a single off-the-shelf device. Sometimes, an unusual set of requirements necessitates a multichip approach, however. One example of such a requirement is the need.....(design idea added 2/05)
Freezer Over-Temperature AlarmThis 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 AlarmThis 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)
IC Temperature Sensor Provides Thermocouple Cold-Junction CompensationNational Semiconductor Application Note  (App Note added 2/06)
LB-24: Versatile IC PreAmplifier Makes Thermocouple Amplifier with Cold Junction CompensationNational Semiconductor Application Note  (App Note added 2/06)
Network Imitates Thermocouples11/08/01 EDN-Design Ideas :  Thermocouples find widespread use for temperature measurement in systems. During system design or testing, you must observe the system's response at different temperatures. However, it's inconvenient to heat a thermocouple.....(design idea added 09/03)
Taking the Uncertainty Out of Thermocouple Temperature MeasurementAN-274 Analog Devices Application Notes  (App Note added 2/06)
TC74 Demo Board for Tiny Serial Digital Thermal SensorThis allows the user to evaluate the functionality of the tiny TC74 thermal sensor and perform comparative evaluations against other thermal management solutions. Easy-to-use software provides a visual representation of temperature profile and can be interfaced with any PC.  (App Note added 6/06)
Thermal considerations matter for Class D Amplifiers04/27/06 EDN-Design Ideas :  (design idea added 09/06)  A few basic calculations can help you estimate the IC's die temperature.
Thermal Techniques Apex-AN11Apex App Note (added 08/08/08)
Thermocouple Interfaces to Serial Port11/09/95 EDN-Design Ideas :  The circuit in Figure 1 acquires temperature data via an IBM PC serial port using a thermocouple-based sensor. The sensor is a type-K (chromel-alumel)thermocouple. When in contact, the dissimilar metals produce a potential difference that is a function of temperature. Additional thermocouple junctions.....(design idea added 3/03)
Thermocouple MeasurementAN28 Linear Technology Considerations for thermocouple-based temperature measurement are discussed. A tutorial on temperature sensors summarizes performance of various types, establishing a perspective on thermocouples. Thermocouples are then focused on. Included are sections covering cold-junction compensation, Amplifier selection, di....
Thermocouple Signal Conditioning using the AD594/AD595AN-369 Analog Devices Application Notes  (App Note added 2/06)  This application note reviews thermocouple basics and illustrates circuit designs for thermocouple signal conditioning using the AD594/AD595.
Thermocouple Temperature Activates RelayVoltage from a high temperature thermocouple activates a relay when the sensor detects a temperature above 1000 degrees F.  (added 7/06) ….(designed by David A. Johnson)
ThermocouplerUses a 16F84 to read a thermocouple via a Maxim's Max6674 (design added 6/07)
Thermoelectric Cooler Temperature Controller for Fiber Optic LasersAN89 Linear Technology This application note presents circuitry for maintaining 0.01°C temperature control of fiber optic lasers over wide ambient range variations. The circuitry also features high efficiency power delivery, compact size and low noise. Detailed descriptions of circuitry and results are given with special emphasis on rmal loop....(App Note added 1/06)
Thermoelectric cooler unipolar drive achieves stable temperatures12/03/07 EDN-Design Ideas :  Depending on the direction of current flow, Peltier devices can both heat and cool. 
Ultraprecise Instrumentation Amplifier Makes Robust Thermocouple InterfaceDN302  Design Notes (Linear Technology) (App Note added 6/06)
Versatile IC PreAmplifier Makes Thermocouple Amplifier with Cold Junction Compensation National Semiconductor Application Note  (App Note added 2/06)
 


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