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Temperature Control Circuits
Temperature Controls:  #'s - K       L - Z
Last Updated on: Friday, March 12, 2010 12:07 PM

 

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 - 11/27/08 EDN-Design Ideas: ,  By periodically setting the TEC's drive to zero, a storage capacitor samples and holds the Seebeck voltage.....(design idea added 08/09)
ADC Enables Temperature Compensated Weigh Scale Measurements - 07/05/01 EDN-Design Ideas:    You can provide temperature compensation in weigh-scale applications by simultaneously measuring both  temperature of  bridge and  primary output of  bridge transducer. Traditionally, an integrated multiplexer connects multiple input variables to a single sigma-delta ADC. Each time  multiplexer switches  input,  ADC must flush  digital filter of all data pertaining to t.....(design idea added 1/05)
ADC Helps Temperature Compensate Transducer - 01/20/94 EDN-Design Ideas:  You can use many tricks to make temperature-compensated resistive full-bridge transducers, such as piezoresistive pressure or strain-guage sensors. Most of these tricks use some additional thermosensitive components that produce a compensating voltage or current. The disadvantages of such solutions are obvious: low accuracy.....(design idea added 11/05)
AN-214: Ground Rules for High Speed Circuits - AN-214 Analog Devices Application Note  (app note added 6/06)  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 added 6/06)
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 added 6/06)  Know Your Ground and Signal Paths for Effective Designs. Current Flow Seeks Path of Least Impedance-Not Just Resistance....
AN-347: Shielding and Guarding - AN-347 Analog Devices Application Note  (app note added 6/06)  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 added 6/06)  This application note reviews rmocouple basics and illustrates circuit designs for rmocouple signal conditioning using  AD594/AD595.
AN-383: Embedded Shock and 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, and Linearity of High Dynamic Range RMS RF Power Detectors - AN-653 Analog Devices Application Note  (app note added 6/06)
AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package - AN-772 Analog Devices Application Note  (app note added 6/06)
AN-829: Environmental Compensation on the AD7142: The Effects of Temperature and Humidity on Capacitance Sensors - AN-829 Analog Devices Application Notes  (app note added 6/06)
Attenuators Nullify Temperature Deviations - 08/17/98 EDN-Design Ideas:  (design idea added 6/06)
Auto-Fan automatic temperature Control - (Tony van Roon's circuit added 9/04)
Bang Bang Thermostat is Simple  & Efficient - 11/06/97 EDN-Design Ideas:  Perhaps the simplest and oldest feedback loop is the nonproportional, all-or-nothing, "bang-bang" thermostat. Fully turning on a heater when the 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 us in virtually every household-room thermostat, clothes dryer, oven, and aquarium heater, to name a few. The version in Figure 1 preserves the best features of the old bang-bang: low cost, simplicity, and efficiency combined with setpoint stability.....(design idea added 10/04)
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 added 3/03)
Circuit compensates optocoupler temperature coefficient - 11/22/01 EDN-Design Ideas:  When using an optocoupler in a linear application, you should consider its gain drift with temperature. Traditional singleand 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 added 1/05)
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.....(design idea added 6/06)
Circuit generates Fan speed Control - 03/21/02 EDN-Design Ideas:     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 hence, fan speed necessary 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,.....(design idea added 10/03)
Circuit improves on temperature measurement - 05/02/02 EDN-Design Ideas:     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.....(design idea added 10/03)
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)
Cold Activated Switch (Andy Collinson) - A simple thermistor triggered cold switch with adjustable threshold.  (added 10/05)
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)
Controller Provides Closed Loop Temperature Regulation - 05/08/97 EDN-Design Ideas:  (design idea added 3/03)
Current and 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....(electronic schematic / circuit added 4/02)
Eliminate thermoelectric EMF in Low ohm measurements - 06/13/02 EDN-Design Ideas:  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.....(design idea added 1/05)
Embedding Temperature Information in the ADXL202's PWM Outputs - AN-600 Analog Devices Application Notes  (app note added 6/06)
Environmental Compensation on the AD7144 - AN-829 Analog Devices Application Notes  (app note added 6/06)
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.... (electronic design added 6/07)
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.....(design idea added 2/03)
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....
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.
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, and Linearity of High Dynamic Range RMS RF Power Detectors - AN-653 Analog Devices Application Note  (app note added 6/06)
Isolation Techniques for Signal Conditioning - National Semiconductor Application Note  (app note added 2/06)

 
Temperature Controls:  #'s - K       L - Z
 
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