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MicroMinimal Thermometer - NOTE: Must register on this site __ Designed by Published in Elecktor July/Aug, 2010
Micropower Thermocouple Signal Conditioner with Cold Junction Compensation - A thermistor, shown as R3, is used to monitor the cold junction temperature. its resistance becomes smaller as the cold junction temperature increases. An increase in cold junction temperature will reduce the output voltage of the Type J thermocouple by 52uV/C. The voltage reference and scaling of resistor values creates an __ Linear Technology/Analog Devices App Note, Jun 21st 2011
Minimizing thermocouples maintains 20-bit DAC precision - 05/03/01 EDN Technical Article: Undesirable and unintended thermocouples are the primary sources of error in low-drift circuits. Attention to layout and other construction details is the only way to tackle the problem. Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke. He was 63.
MOSFET_Temperature_Sensor - Recently I was asked by a company to discover why one of their products failed to operate properly in cold temperatures. Two n-channel MOSFETs and a few resistors are wired to form a flip/flop latch circuit. Each time the pushbutton switch is pressed, the circuit changes state and remains in that state until another activation of the switch. . . . Dave Johnson, Lubbock TX (December 1, 2010)-DC Magazine - Issue 14 Dec 2010
Motor Protection/Regulation - The LTC2990 is used to monitor system temperatures, voltages and currents. Through the i2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC. __ Linear Technology/Analog Devices App Notes, Oct 26th 2010
Motor Protection/Regulation-LTC2991 - The LTC2991 is used to monitor system temperatures, voltages and currents. Through the i2C serial interface, the eight monitors can individually measure supply voltages and can be paired for differential measurements of current sense resistors or temperature sensing transistors. Additional measurements include internal temperature__ Linear Technology/Analog Devices App Note, Sep 7th 2011
Multichannel Temperature Monitor - 03/04/04 EDN Design Ideas: You can use an ADT7461 single-channel temperature monitor, an ADG708 low-voltage, low-leakage CMOS
8-to-1 multiplexer, and three standard 2N3906 PNP transistors to measure the temperatures of three separate remote thermal zones (F Design by Susan Pratt, Analog Devices, Limerick, Ireland
Multichannel Visual Thermometer - Temperature of some electronic components used in a device may rise unexpectedly and these might get damaged. This multichannel visual thermometer can indicate the problem through glowing LEDs. Since transistors are...__ Electronics Projects for You
mV Source for Thermocouple simulation - I realized early that for prototyping and troubleshooting, I would require a millivolt source which can simulate a type K TC. For now, this circuit is what I devised. When the ECU is complete, I will do final calibration with a lab-grade TC simulator, and develop software interpolation of the non-linear curve. But to simply create the Op-amp interface to amplify the signal, this little circuit seems to work quite well. it is mounted on a 2" square PC board with a 9V battery. I used a 10-turn 1K pot (expensive). A normal pot will work fine. Vary the 120K resistance to increase or decrease the mV signal range. in this configuration, it will output a fairly stable 0 to 40 mV. __
Network imitates thermocouples - 11/08/01 EDN Design Ideas: Thermocouples find wideaspread 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 every tim Design by Abel Raynus, Armatron International, Melrose, MA
Nokia 3310 LCD & PIC12F629 Thermometer - Device with Nokia 3310 Lcd, Pic12F629 & DS18B20 temperature 1Wire sensor - published in magazine "Svijet elektronike" Nr.58 (June / July 2006) . Author: ivica Novakovic __ Designed by © Ivica Novakovic
Nokia 7650 LCD Controller - Despite nobody seems to own the appropriate documentation, it is possible to use the big cheap color LCD displays of the Nokia series 60 cell phones for home brew projects. I don't even have the docs and it was a rough and painful way, but now it works__
Novel isolates temperature sensor from its host - 08/03/06 EDN Design Ideas: Temperature-to-period converter and transformer driver provide power and signal isolation Design by Alfredo H Saab and Tamer Mogannam, Maxim Integrated Products Inc, Sunnyvale, CA
NTC Thermistor Model - (spice design) __ Designed by Rick
On-Off Temperature Control - This circuit controls a load (in this case a dc brushless fan) based on a temperature compared with a setpoint. THe transduced is a diode in the forward polarization regime. in fact when forward biased, the forward voltage drop accross a diode has a temperature dependance, in particular has a negative linear (ish) slope __ Contact Jonathan Filippi
Oscillator/Reference Oven Temperature Regulation - The LTC2990 is used to monitor system temperatures, voltages and currents. Through the i2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC. The internal 10ppm/°C reference minimizes the number of supporting __ Linear Technology/Analog Devices App Note, Mar 16th 2011
Oscillators Convert Temperature to Time - 03/30/95 EDN Design Ideas: Fig 1's simple arrangement of active-R oscillators accurately converts temperature into time. Most designers use these types of oscillators for low-grade oscillators that don't have stringent waveshape and frequency-stability requirements. However, the three-phase symmetrical active-R oscillator actually can generate an excellent triangular waveform. in this case, the oscillators become relaxation generators in which the input stage's constant bias current periodically charges and discharges the op amp's compensation capacitor. Design by Dan Stiurca, Gh Asachi Technical University, Iasi, Romania
Over-Heating Indicator for Water Pipe - The hot water pipe from the water geyser of your bathroom may burst if it gets overheated and is left unattended. This circuit monitors the temperature of the water pipe. if...__ Electronics Projects for You
Over-Temperature Alarm - This circuit can be used as a warning device which triggers an alarm whenever the temperature exceeds a preset level. it can also be used as a door-alert or general warning...__ Electronics Projects for You
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 Dave Johnson P.E.-June, 2000
Parallel port provides high-resolution temperature sensing - 10/03/02 EDN Design Ideas: Simple tester checks LCDs - High-resolution temperature sensing at low cost is possible using only one chip attached to the PC's parallel port (Figure 1). The Dallas Semiconductor (www.dalsemi.com] DS1722 digital thermometer allows measurement resolution as fine as 0.0625°C in digital form and with linear response. The accuracy specification is only 2°C, but you can improve this figure by careful calibration Design by Martin Connors and Mike Foote, Athabasca University, AB, Canada
PC thermometer using PC game Joystick Port - A method of measuring temperature using the PC Game port. Display is via the program dialog or in the System tray. V2.2.5 supports timed FTP to a web server __ Designed by andrew AT AndysWorld
Peltier Devices or Thermoelectric Modules - Also known as TE Modules or Solid State Heat Pumps. __ Designed by G.L. Chemelec
PID Temperature Controller - What's a PID controller? PID stands for "proportional integral differential" and relates to a process which seeks to continuously correct the error between a measured variable and a desired setting by calculating an appropriate correction process. in practice, it can largely avoid the large overshoots and undershoots that occur in simple temperature control systems.__ SiliconChip
Platinum RTD Digitizer Accurate within 1° Over 0°C to 100°C - Platinum RTD Value is Linearly Converted to Period by LTC1799. Logic and Second LTC1799 Clock Digitize Period into Output Data Bursts. Bootstrapping Pin Capacitance is used to Permit Remotely Located Sensor. __ Linear Technology/Analog Devices App Note, Apr 7th 2010
Platinum RTD Signal Conditioner with Curvature Correction - The left stage forms a stable precision current source by establishing the reference voltage across a precision resistor, and about half of this current passes through the sensor. The right OpAmp provides an amplification of the resistance difference between the sensor and a fixed precision resistor to generate a temperature__ Linear Technology/Analog Devices App Note, Jun 21, 2011
Precision T/C Amplifier with cold junction compensation for the BS2 - A thermocouple signal is quite small, and the long thermocouple leads often induce quite a bit of noise into the system. This new circuit is far more accurate, stable, and less immune to noise. it makes use of a Linear Technologies LT1025 chip to provide CJC (Cold Junction Compensation) , an LTC1098 8-bit 2-channel Analogue to Digital Converter, and an LTC1050 chopper amp. The feedback resistors are designed to deliver 5V (full scale signal) to the ADC with a 1000 degree C. Type K signal. The 1050 is a great amplifier, delivering "rail to rail" output which makes powering the circuit simple. __
Precision Temperature Controller Has Thermal-Gradient Compensation - 06/12/08 EDN Design Ideas: An electronic work-around cancels the effects of thermal gradients in the load's thermal impedances Design by W Stephen Woodward, Chapel Hill, NC
Precision Temperature Logger & Controller, Part 1 - This Temperature Logger & Controller is based on the Dick Smith Electronics Q1437 digital thermometer. it records & displays two temperature channels once a second on a PC over a period of up to 12 hours. With appropriate thermocouples, temperatures from -200?C to +1300?C can be recorded, with the display range, resolution, and temperature program adjustable in real time while the data is being logged.__ SiliconChip
Programmable Electronic Thermostat - it's programmed using a PC and has three relays to control external equipment.__ SiliconChip
Provide 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 Design by Mark Maddox, Analog Devices, Wilmington, MA, and John Wynne, Analog Devices, Limerick, Ireland
Pseudo-differential Multichannel Bridge Digitizer & Digital Cold Junction Compensation - This circuit enables pseud-differential measurements of several bridge transducers and absolute temperature measurement. Consecutive readings are performed on each side of the bridge by selecting the appropriate channel on the LTC2428. Each output is digitized and the results digitally subtracted to obtain the pseudo-differential __ Linear Technology/Analog Devices App Note, Apr 29th 2010
Pseudologarithmic thermistor signal conditioning spans wide temperature range - 6-Jan-05 EDN Design Ideas: Given its low cost, small size, robust construction, accuracy, versatility and sensitivity, it's no wonder that the thermistor rates as one of the most popular temperature sensors available. However, in some applications, a thermistor can exhibit too much sensitivity for wide-range temperature measurements Design by Stephen Woodward, University of North Carolina, Chapel Hill, NC
Quartz crystal-based remote thermometer features direct Celsius readout - 03/17/05 EDN Design Ideas: Although quartz crystals have served as temperature sensors, designers haven't taken advantage of the technology because few manufacturers offer the sensors as standard products (references 1 and 2]. in contrast to conventional resistance- or semiconductor-based sensors, a quartz-based sensor provide as inherently digital-signal conditioning, good stability, and a direct digital ou Design by Jim Williams and Mark Thoren, Linear Technology Corp
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