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Temperature Control Circuits

Temperature Controls:  #'s - F       G - S       T - Z
 

Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :
Infrared Safety Switch -  Using a slotted optical sensor, this circuit can be used as a replacement for a large mushroom pushbutton safety switch. . . Circuit by David A. Johnson P.E.-July, 2006

Micro Power Over-Temperature Alarm -  The circuit is powered for years by a single 3 volt lithium battery.  It sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature (freeze) alarm.  The circuit uses a. . . Circuit by David A. Johnson P.E.-June, 2000

Over-Temperature Micro-Power Alarm -  The circuit is powered for years by a single 3 volt lithium battery.  It sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature (freeze) alarm.  The circuit uses a . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Replace a Pushbutton Switch with this Infrared Safety Switch -  Using a slotted optical sensor, this circuit can be used as a replacement for a large mushroom pushbutton safety switch . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

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Generate 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¡ªhence, fan speed¡ªnecessary for cooling is less at low ambient temp __ Circuit Design by Jim Christensen, Maxim Integrated Products, Sunnyvale, CA

Heating System Thermostat -  This circuit is intended to control a heating system or central heating plan, keeping constant indoor temperature in spite of wide range changes in the outdoor one. Two sensors are needed: one placed outdoors, in order to sense the external temperature; the other placed on the water-pipe returning from heating system circuit, short before its input to the boiler. __ Contact Flavio Dellepiane, fladello @ tin.it

Improve 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 us __ Circuit Design by Alexander Bell, Infosoft International Inc, Rego Park, NY

Infrared Safety Switch -  Using a slotted optical sensor, this circuit can be used as a replacement for a large mushroom pushbutton safety switch. . . Circuit by David A. Johnson P.E.-July, 2006

Micro Power Over-Temperature Alarm -  The circuit is powered for years by a single 3 volt lithium battery.  it sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature (freeze) alarm.  The circuit uses a. . . Circuit by David A. Johnson P.E.-June, 2000

Microcontroller converts digital-temperature-sensor readings without floating-point arithmetic -  03/05/09  EDN Design Ideas:  Convert digital-temperature-sensor readings without floating-point arithmetic __ Circuit Design by Jordan Dimitrov, Toronto, ON, Canada

Microcontroller-Temperature Measurement Uses Only a Diode & a Capacitor -  12/05/08  EDN Design Ideas:  Discharging a capacitor through the reverse leakage of a PN junction allows you to measure ambient temperature.  Using a PN-junction diode for temperature measurement usually depends on its 2‑mV/K temperature  coefficient.  Conventionally, you must amplify and digitize this voltage with an ADC before you can use the value in a microcontroller.  Less well-known is the fact that the reverse current of a PN-junction diode shows a good exponential dependency over temperature; increasing the temperature by approximately 12K doubles the leakage (Figure 1).  An easy way to measure current over such a large range of two to three decades is to charge and discharge a capacitor and measure the time or frequency __ Circuit Design by Andreas Grun

Over-Temperature Micro-Power Alarm -  The circuit is powered for years by a single 3 volt lithium battery.  it sounds an alarm when the temperature exceeds a certain point.  With some minor changes the circuit could also be configured for an under temperature (freeze) alarm.  The circuit uses a . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

Peltier Element Controls Itself -  10/27/94 EDN Design Ideas:  Peltier elements, or semiconductor heat pumps, combined with heat sinks are a designer's choice when controlled low temperature is required for CCDs and high-density IC s.  These devices are suitable for device temperature cycling in reliability tests __ Circuit Design by Dmitrii Loukianov, Moscow, Russia

PIC Projects: Digital Temperature Controller -  Digital temperature controller is an essential instrument in the field of electronics, instrumentation and control automation for measuring and controlling temperatures.  it can be used as much at homes as in...__ Electronics Projects for You

Program converts temperature from RTD sensor -  06/05/97 EDN Design Ideas:    100V, platinum resistance-temperature-detector (RTD]sensor provide as an accurate means of obtaining temperature readings.  Platinum sensors have a nonlinear resistance-vs-temperature characteristic; therefore, for __ Circuit Design by Robert Ruehle, Relco Products, Denver, CO

Quad Comparator Regulates Temperature -  10/26/95 EDN Design Ideas:  Using a negative-temperature-coefficient thermistor, the circuit in Fig 1a controls temperature within 1°C or better with a minimum of components, cost, and complexity.  The circuit includes protection against a short or open temperature sensor.  You can purchase all of the key components, except the actual heating element, at the local Radio Shack.    __ Circuit Design by H Randall Moore, Lake Forest, CA

Replace a Pushbutton Switch with this Infrared Safety Switch -  Using a slotted optical sensor, this circuit can be used as a replacement for a large mushroom pushbutton safety switch . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Resistor packs eliminate temperature drift -  06/19/97 EDN Design Ideas:  Finding low-temperature-coefficient resistors for 10-bit or more accurate analog applications is often a problem in the laboratory.  Even if you have a good collection of precision, low-temperature-coefficient resistors in stock, chances are they won't track across even room temperatures. __ Circuit Design by Jim Hansen, Kollsman Inc, Merrimack, NH

Resolving Very Small Temperature Differences with the LTC2402 -  DN257 Design Notes__ Linear Technology/Analog Devices

Room heating controller -  Tired of mechanical thermostats that overshoot the set point and make you waste expensive energy? Here is a phase-control device that works well and is simple!  __ Designed by Manfred Mornhinweg

Selecting Temperature Transducers for Data Acquisition Systems 5988-7505en -  Application Note__ Aligent

Self Powered Solar Box Furnace -  This project involves the construction of a self contained solar box furnace (Photo 1).  I assembled the prototype with materials that I had laying around my workshop.  it is suitable for heating up a small room or a detached shed.  I use the furnace to warm up my garage, it takes the chill out of a fairly large space when the weather is cold, but sunny.  it is possible to scale this project up to any size, a larger version, or a set of them, could be used to add a lot of supplemental heat a house __ Designed by G. Forrest Cook

Simple  Soldering Iron Temperature Regulator -  Soldering irons are available in different wattage and usually run at 230V AC mains.  However, these have no temperature control.  Low-voltage soldering irons (e.g., 12V) generally form part of a soldering...__ Electronics Projects for You

Simple Circuit Microcontroller-Temperature Measurement Uses Only a Diode & a Capacitor -  12/05/08  EDN Design Ideas:  Discharging a capacitor through the reverse leakage of a PN junction allows you to measure ambient temperature.  Using a PN-junction diode for temperature measurement usually depends on its 2‑mV/K temperature  coefficient.  Conventionally, you must amplify and digitize this voltage with an ADC before you can use the value in a microcontroller.  Less well-known is the fact that the reverse current of a PN-junction diode shows a good exponential dependency over temperature; increasing the temperature by approximately 12K doubles the leakage (Figure 1).  An easy way to measure current over such a large range of two to three decades is to charge and discharge a capacitor and measure the time or frequency __ Circuit Design by Andreas Grun

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Temperature Controls:  #'s - F       G - S       T - Z

 


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