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Temperature Control Circuits
Temperature Controls:  #'s - K       L - Z
Last Updated on: Friday, October 03, 2014 10:38 AM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

A NEW Thermostat Control for Electric Heaters -    ….(electronic schematic added 12/08)
Achieve precision temperature control with TEC Seebeck voltage sampling -  27-Nov-08 Issue of EDN  By periodically setting the TEC's drive to zero, a storage capacitor samples and holds the Seebeck voltage.... [Design Idea by W Stephen Woodward, Chapel Hill, NC]
ADC enables temperature compensated weigh scale measurements -  5-Jul-01 Issue of EDN  You can provide temperature compensation in weigh-scale applications by simultaneously measuring both the temperature of the bridge and the primary output of the bridge transducer.... [Design Idea by Albert O'Grady, Analog Devices, Limerick, Ireland]
ADC Helps Temperature Compensate Transducer -  01/20/94 EDN-Design Ideas....You can use many tricks to make temperature-compensated.... [Design Idea by Alexander L Belousov, Science Instruments Co, Baltimore, MD]
AN-214: Ground Rules for High Speed Circuits -  AN-214 Analog Devices Application Note....[App Note]  Layout and Wiring Are Critical in Video Converter Circuits.

AN-274: Taking the Uncertainty Out of Thermocouple Temperature Measurement -  AN-274 Analog Devices Application Note....[App Note]
AN-298: Isolation Techniques for Signal Conditioning -  National Semiconductor Application Note  (app note added 2/06)
AN-345: Grounding for Low-and-High-Frequency Circuits -  AN-345 Analog Devices Application Note....[App Note]  Know Your Ground and Signal Paths for Effective Designs. Current Flow Seeks Path of Least Impedance-Not Just Resistance....
AN-347: Shielding & Guarding -  AN-347 Analog Devices Application Note....[App Note]  How to Exclude Interference-Type Noise. What to do and Why to do it-A Rational Approach
AN-349: Keys to Longer Life for CMOS -  AN-349 Analog Devices Application Notes  (app note added 09/08) Here's How CMOS Can be Protected Against Abuse
AN-369: Thermocouple Signal Conditioning Using the AD594/AD595 -  AN-369 Analog Devices Application Note....[App Note]This application note reviews rmocouple basics and illustrates Circuit designs for rmocouple signal conditioning using  AD594/AD595.
AN-383: Embedded Shock & Temperature Recorder -  AN-383 Analog Devices Application Notes  (app note added 6/06)
AN-600: Embedding Temperature Information in the ADXL202's PWM Outputs -  AN-600 Analog Devices Application Notes  (app note added 6/06)
AN-653: Improving Temperature, Stability, & Linearity of High Dynamic Range RMS RF Power Detectors -  AN-653 Analog Devices Application Note....[App Note]
AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -  AN-772 Analog Devices Application Note....[App Note]
AN-829: Environmental Compensation on the AD7142: The Effects of Temperature & Humidity on Capacitance Sensors -  AN-829 Analog Devices Application Notes....[App Note]
Attenuators Nullify Temperature Deviations -  08/17/98 EDN-Design Ideas....A combinatorial function with a propagation delay greater than the system clock period does not necessarily prevent a design from operating at frequency. By taking advantage of arrival times or carefully using wait states, a design can give the combinatorial circuit sufficient time....File has several circuits, scroll to this one.... [Design Idea by Kevin Skahill, Cypress Semiconductor, San Jose, CA]
Auto-Fan automatic temperature Control -  This circuit was designed to automatically activate a set of three or four small DC fans to cool a large cool-rib for a 10 Amp powersupply. Can be used in a variety of other applications as well.…. [Tony van Roon's circuit]
Bang Bang Thermostat is Simple & Efficient -  11/06/97 EDN-Design Ideas....Perhaps  simplest and oldest feedback loop is  nonproportional, all-or-nothing, "bang-bang" rmostat. Fully turning on a heater when  temperature is below setpoint and off when it's above setpoint is a straightforward example of a servomechanism. Yet, elementary and crude as servomechanisms are, examples surround.... [Design Idea by W Stephen Woodward, University of North Carolina--Chapel Hill]
Boost Converter Controls 12 Volt Fan from 5 Volt Supply -  12/12/97 EDN-Design Ideas....Temperature-controlled PWM boost converter allows operation of a12V brushless dc fan from a5V supply.… [Design Idea by John McNeill, Worcester Polytechnic Institute, Worcester, MA]
Circuit compensates optocoupler temperature coefficient -  22-Nov-01 Issue of EDN  When using an optocoupler in a linear application, you should consider its gain drift with temperature. Traditional single- and dual-transistor-output devices have a notable gain drift with temperature. In recent years, some temperature-compensated optocouplers have appeared. However, another option is to use two optocouplers or a dual optocoupler with appropriate feedback to make the dri.... [Design Idea by J Michael Zias, Acme Electric Corp, Cuba, NY]
Circuit Controls Multiple Thermoelectric Coolers -  08/19/99 EDN-Design Ideas....Optoelectronic and other components sometimes use a thermoelectric cooler and a thermistor for temperature control. A typical thermoelectric cooler.... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Circuit generates fan-speed control -  21-Mar-02 Issue of EDN  Fan noise is becoming a significant issue as electronic equipment increasingly enters the office and the home. Noise is proportional to fan speed, and the airflow¡ªhence, fan speed¡ªnecessary for cooling is less at low ambient temperatures. Because ambient temperature is lower than the upper design point most of the time, a fan can run slower, making it easier on the ears.... [Design Idea by Jim Christensen, Maxim Integrated Products, Sunnyvale, CA]
Circuit improves on temperature measurement -  2-May-02 Issue of EDN  When current pulses with a stable IHIGH/ILOW ratio modulate a semiconductor junction, the ensuing voltage difference (for example, ΔVBE for a bipolar transistor] is a linear function of the absolute (Kelvin] temperature, T. You can use this truism to make accurate temperature measurements. Technical literature has thoroughly covered the relationship (references 1 to 4] and has numerou.... [Design Idea by Alexander Bell, Infosoft International Inc, Rego Park, NY]
Cold Activated Switch -  The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead type thermistor is found in the Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of temperatures. A slight amount of hysteresis is provided by inclusion of the 270k resistor.  This prevents relay chatter when temperature is near the switching threshold of this circuit. (added 2/06) [Andy Collison's circuit]
Constant Temperature Circuit -  This circuit is a generic low power temperature controller that can be used for stabilizing temperature sensitive electronic circuits. It was built to stabilize a radio frequency VFO (Variable Frequency Oscillator) for ham radio applications. The circuit has also been used to lower the drift of a Ramsey FM10a micropower FM transmitter....(electronic schematic / circuit added 4/02) [G. Forrest Cook]
Controller Provides Closed Loop Temperature Regulation -  05/08/97 EDN-Design Ideas.... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.
Cooling Fan Controller -  As we begin to enjoy those lazy hazy days of summer, the most important thing on most of our minds is how to keep cool during those hot days. For some of us that means turning up the old air conditioner and sipping on a nice cold glass of our favorite soft drink. However, we often forget about an equally important.... [Radio Amateur Society of Norwich]
Current & temperature ratings -  Coilcraft Power Magnetics Application Note (app note added 6/06)
Digital Thermostat with LED Temperature Display -  I needed to replace two old, unreliable thermostats for controlling the heating and cooling for a large garden shed. Commercial basic digital thermostats are available quite cheaply, but some lack the ability to control heavy loads or have the extra features that I require for saving energy when the door is often left open or to indicate temperature being out of range etc. I like the PIC18F1320 microcontroller used in my previous project, so decided to use it again in a very similar design to drive three multiplexed LED displays and read the temperature from a Dallas/Maxim DS18x20 "1-Wire" digital sensor. ….(design added 11/08)
Dual Comparator -  forms temperature-compensated proximity Detector (app note added 5/02)
Electronic Thermostat Relay Circuit -  Here is a simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current requirements for the heater. Temperature changes are detected by a (1.7K @ 70F) thermistor placed in series with a 5K potentiometer which produces about.... [Bill Bowden]
Eliminate thermoelectric EMF in low-ohm measurements -  13-Jun-02 Issue of EDN  When two different-metal conductors connect together in a loop and one of the junctions is at a higher temperature than the other, an electrical current flows through the loop. The magnitude of this current depends on the type of metals involved and the temperature differential of the junctions. When you open such a loop, a thermoelectric voltage appears across the open ends.... [Design Idea by John Wynne, Analog Devices, Limerick, Ireland]
Embedded Shock & Temperature Recorder -  AN-383 Analog Devices Application Notes  (app note added 6/06)
Embedding Temperature Information in the ADXL202's PWM Outputs -  AN-600 Analog Devices Application Notes  (app note added 6/06)
Environmental Compensation on the AD7142 -  AN-829 Analog Devices Application Notes....[App Note]
Fan control -  As we begin to enjoy those lazy hazy days of summer, the most important thing on most of our minds is how to keep cool during those hot days. For some of us that means turning up the old air conditioner and sipping on a nice cold glass of our favorite soft drink. However, we often forget about an equally important.... [Radio Amateur Society of Norwich]
Fan Controller Adapts to System Temperature -  09/25/97 EDN-Design Ideas....Any piece of electronic equipment--whether it be a lab instrument, an audio amplifier, or a PC--that relies on a cooling fan to control internal temperature is a potential source of noise pollution or even hearing damage. Most of the time, the fan's noise level is probably much higher than necessary, because it has enough capacity to move.... [Design Idea by Kerry Lacanette, National Semiconductor, Tucson, AZ]
Fan Dual-Controller -  Each fan turns off when the temperature drops 5 degrees below its turn-on temperature. For example, if the dial is set to 80 degrees, the fan turns on at 80 degrees and turns off at 75 degrees.  This prevents the fan from cycling on and off rapidly, which would occur if the fan turned on at 80, started to cool the cabinet, and then immediately turned off at 79. ….(design added 11/08)
Fan Speed Controller -  Simple circuit for fan speed control based on thermal feedback. To reduce product noise. Design idea was rejected! Years later companies are making millions from such circuits.… [Jim Haggerman, Hagerman Technology LLC]
Fan Thermostat -  Build a simple fan thermostat with LM35, ADC0804 and 89C51.  ….(design added 06/09)
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.... [Hobby Corner Circuit by Dave 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. [Hobby Corner Circuit by Dave Johnson]
Fridge door Alarm -  Beeps if you leave open the door over 20 seconds.  3V battery operation, simple circuitry.  (circuit added 9/04)
Frost Alarm (Andy Collinson) -  The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead type thermistor is found in the Maplin catalogue. The 100k pot allows this circuit to trigger over a wide range of temperatures. A slight amount of hysteresis is provided by inclusion of the 270k resistor.  This prevents relay chatter when temperature is near the switching threshold of this circuit. (added 2/06)
Heating System Thermostat -  Controlled by indoor and outdoor temperature.  Simple, high reliability design.  (circuit added 9/04)
Improving Temperature, Stability, & Linearity of High Dynamic Range RMS RF Power Detectors -  AN-653 Analog Devices Application Note....[App Note]
Isolation Techniques for Signal Conditioning -  National Semiconductor Application Note  (app note added 2/06)

Temperature Control Circuits
Temperature Controls:  #'s - K       L - Z

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