Web DiscoverCircuits.com

Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 28,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to material posted by the designer. 
Please let us if you would like us to link to your design.

HOME Schematics Discover Forum Hobby Corner Dave's Circuits Electronic Resources Book Corner Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson &
Associates
My eBay Auctions Faraday Touch Switches

Thermocoupler Circuits
Last Updated on: Friday, March 12, 2010 12:07 PM


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 Thermocouple - This 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)
A Thermoelectric Cooler Temperature Controller for Fiber Optic Lasers - AN89 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/AD595 - AN-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® Mcus - Microchip Application Note Published 21-Jul-02  (app note added 6/06)
Apex-AN11 Thermal Techniques - 1/2005, AN11UREVD : 359 Kb (Apex App Note added 08/08/08)
Circuit provides cold junction compensation - 11/28/02 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 DAC - 10/31/02 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 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)
IC Temperature Sensor Provides Thermocouple Cold-Junction Compensation - National Semiconductor Application Note  (app note added 2/06)
LB-24: Versatile IC PreAmplifier Makes Thermocouple Amplifier with Cold Junction Compensation - National Semiconductor Application Note  (app note added 2/06)
Network Imitates Thermocouples - 11/08/01 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 Measurement - AN-274 Analog Devices Application Notes  (app note added 2/06)
TC74 Demo Board for Tiny Serial Digital Thermal Sensor - This 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 amplifiers - 04/27/06 EDN-Design Ideas:  (design idea added 09/06)  A few basic calculations can help you estimate the IC's die temperature.
Thermal Techniques Apex-AN11 - Apex App Note (added 08/08/08)
Thermocouple Interfaces to Serial Port - 11/09/95 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 Measurement - AN28 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/AD595 - AN-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 Relay - Voltage 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)
Thermocoupler - Uses a 16F84 to read a thermocouple via a Maxim's Max6674 (design added 6/07)
Thermoelectric Cooler Temperature Controller for Fiber Optic Lasers - AN89 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 temperatures - 12/03/07 EDN-Design Ideas:  Depending on the direction of current flow, Peltier devices can both heat and cool. 
Ultraprecise Instrumentation Amplifier Makes Robust Thermocouple Interface - DN302  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)

 
 
 
HOME Schematics Discover Forum Hobby Corner Dave's Circuits Electronic Resources Book Corner Contact Info

 Linking is welcomed but COPYING any content or graphics to your web site is expressly prohibited.

 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy