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Remote Temp Sensor Needs No Power Supply - 12/21/95 EDN Design Ideas: Measuring temperature at a remote location is a common requirement, but the implementation is usually not straightforward. Most temperature sensors have a voltage or current output, which, to minimize noise pickup, should undergo conversion to digital form near the sensor. Thus, an ADC, a digital interface, and a power supply must all be situated at the temperature-measurement point. The circuit in Figure 1 monitors the temperature at a remote location and transmits that temperature to a host computer. Design by Wes Freeman, Analog Devices Inc Santa Clara, CA
Remote Thermometer - This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor's output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section counts the bursts coming from mains supply and shows the counting on three 7-segment LED displays. The least significant digit displays tenths of degree and then a 00.0 to 99.9 °C range is obtained. Transmitter-receiver distance can reach hundred meters, provided both units are connected to the mains supply within the control of the same light-meter. __
Remote Thermometer - This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor's output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section counts the bursts coming from mains supply and shows the counting on three 7-segment LED displays. The least significant digit displays tenths of degree and then a 00.0 to 99.9 °C range is obtained. Transmitter-receiver distance can reach hundred meters, provided both units are connected to the mains supply within the control of the same light-meter. __ Contact Flavio Dellepiane, fladello @ tin.it
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
Room temperature controller - On this page, I will introduce the room temperature controller with PIC . This equipment uses two temperature sensors, drives external equipment, and keeps the temperature of the room at preset temperature. The purpose of this equipment is for preventing room temperature going up with the heat of the computers. Electric cost will become high if an air-conditioner is always operated. Then, I made the equipment __ Designed by Seiichi Inoue
RTD & Thermocouple Remote Temperature Digitizer - The LTC2449 is commonly used with thermocouples and RTDs as shown in this circuit. Thermocouple outputs produce very small changes (tens of microvolts per degree C) and the output will be negative if the thermocouple is colder than the cold junction connection from the thermocouple to the copper traces on the PCB. The __ Linear Technology/Analog Devices App Notes, Mar 30th 2010
RTD Calculator - Javascript program converts 100 ohm platinum resistance into temperature. __ Designed by Jim Haggerman, Hagerman Technology LLC
RTDs Provide Differential Temperature Measurement - 12/31/69 EDN Design Ideas: You sometimes need to measure the differential temperature between two points in a system to a greater accuracy than that required in measuring the absolute temperature at either of the individual points. Differential-temperature measurement is necessary, for example, in monitoring heating-energy consumption in an apartment. Hot water enters from one pipe, circulates around the apartment through the radiators, and exits through a second pipe. Billing depends on the temperature differential between the entry and exit copper pipes, so absolute temperature is irrelevant. One way of measuring is to attach an RTD (resistance-temperature detector) Design by John Wynne, Analog Devices Inc, Limerick, Ireland
Sensing Method Increases Thermal-Response Time - 1/04/96 EDN Design Ideas: Many temperature-sensing applications require a fast thermal-response time. Dipping a temperature sensor into a fluid on a production line or the protective shutdown of equipment under a runaway thermal condition are two examples. in general, semiconductor temperature sensors are limited in their response times because of the high thermal mass and low thermal conductivity of plastic packaging. Temperature settling times of a few minutes for large step changes ([Delta]T>40°C) in ambient temperatures are common. Design by John McDonald Analog Devices Santa Clara, CA
Sensitive Temperature Switch - This temperature switch has a high sensitivity and is quite reliable. Here, in place of a single transistor, a Darlington pair has been used for switching. At normal room temperature germinum diode...__ Electronics Projects for You
Sensor to Display, Built with Thermistor, 12-Bit ADC, 89S52 & LED Display - This is my student assignment for the class "Designing Microprocessor Based instrumentation". The board demonstrates the use of 12-bit ADC, writing c program with digital filtering and interface the LED display. The reading provides 0.1C sensitivity. The optional input of the ADC is available for exercise with other input signals or sensors. __ Designed by Wichit Sirichote
Shower Stopper - The shower stopper is a project suggested by one of the readers of the Technical Library. His request was for a circuit that would activate a solenoid to shut off the hot water to the shower after a reasonable length of time. it seems that certain members of his household enjoy long, warm showers. This circuit is probably sadistic! The circuit detects when the hot water is turned on in the shower by means of a __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Signal Conditioning for Platinum Temperature Transducers - DN45 Design Notes__ Linear Technology/Analog Devices
Signal Sources, Conditioners and Power Circuitry Circuits of the Fall, 2004 - Linear Technology AN98 __ Designed by Jim Williams - Nov 19th, 2004
Simple Circuit Anticipator Improves On Earlier Idea - EDN Design Ideas: 05/24/2012 A self-biasing thermistor circuit had an overall dominant thermal/electrical time constant as small as 25 msec but had a significantly rounded response following a square (thermal) input pulse of 100 msec; the source was a pulsed blue LED. A single-op-amp-based “anticipator-like” circuit generated a more faithful picture of the actual input excitation, and improved on the circuit described in a previous Design ideas (Reference 1). The lowpass filter in Figure 1, with an RC time constant of approximately 25 msec, models the circuit. Design by Nicholas Lockerbie, Scottish Universities Physics Alliance, Glasgow, Scotland
Simple Circuit Diode Serves as a Sensor for a Thermal Probe - 02/16/12 EDN Design Ideas: A two-transistor thermal probe can be used to diagnose circuit problems, such as hot components and thermal runaway. Design by Raju Baddi, Tata Institute of Fundamental Research, Pune, India
Simple Circuit forms 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
Simple Circuit LM335 thermometer - The circuit consists of two parts: The LM335 and its adjustment. The output of the LM335 is 10 millivolts per degree C, with 25 degrees C corresponding to 2.982 VDC. A reference circuit provides a zero reference voltage. it is adjusted to (2.982 volts - (25 degrees x 10 millivolts/degree) = 2.732 volts. To read the temperature of the LM335 directly in degrees C, connect the + lead from a high impedance DVMto the output pin and the - end of the DVM to the 2.732 volt pin. __ Designed by Dick Cappels
Simple Circuit Thermocouple Amplifier - Continuing with the thermocouple interface concept, the next step is to amplify the TC's millivolt signal into a more readable analog voltage, on the order of 0 to 5VDC. This simple circuit fits the bill. The LM358N is a dual op-amp IC . i'm quite sure any op-amp IC would do fine, just be sure it can accept a Vcc which is compatible with your battery pack. The IC draws ~ 1.0 mA. __
Single 5V Supply Linearized 0°C to 400°C Platinum RTD Amplifier - The LTC2053 is a high precision instrumentation amplifier. The CMRR is typically 116dB with a single or dual 5V supply and is independent of gain. The input offset voltage is guaranteed below 10μV with a temperature drift of less than 50nV/°C. The LTC2053 is easy to use; the gain is adjustable with two external resistors, __ Linear Technology/Analog Devices App Note, Mar 30th 2010
Single 5V Supply Precision Linearized 0°C to 400°C Platinum RTD Signal Conditioner - The LTC6943 is a monolithic, charge-balanced, dual switched capacitor instrumentation building block. A pair of switches alternately connects an external capacitor to an input voltage and then connects the charged capacitor across an output port. The internal switches have a break-before-make action. An internal clock is provided and its frequency can be adjusted with an external capacitor. The LTC6943 can also be driven with an external CMOS
clock.
__ Linear Technology/Analog Devices App Note, Mar 30th 2010
Single Supply Current Source for Platinum RTD - The LT1800's Precision and low bias input stage is used to good advantage in Fig.5 Single Supply Current Source for Platinum RTD circuit. R4 and C1 stabilize the circuit making it insensitive to cable characteristics. Output is 1.00V at 0ºC and its gain factor is 3.85mV/ºC. __ Linear Technology/Analog Devices App Note, Jul 2, 2012
Single Supply Type K Thermocouple Signal Conditioning Amplifier with Cold Junction Compensation - The LTC2050 is a zero-drift precision chopper stabilized operational amplifier available in the 5- or 6-lead SOT-23 and SO-8 packages. it minimizes board area while providing uncompromising DC performance, including 3mV (max) DC offset and 30nV/°C (max) DC offset drift. it operates from a 2.7V supply while still supporting __ Linear Technology/Analog Devices App Note, Apr 9th 2010
Single-Supply Linearizes RTD - 12/21/95 EDN Design Ideas: Accurate temperature measurement in single-supply, low-power applications presents a difficult signal-conditioning problem. in many applications, the temperature sensor may be located a fair distance from the signal-conditioning circuitry, and, as a result, the measurements may Design by Adolfo Garcia, Analog Devices Inc Santa Clara, CA
Soldering iron driver bridge controls temperature - 09/06/13 EDN Design Ideas: With a power supply and a replacement soldering handle you can implement this temperature-controlled soldering iron driver. One way you can control the temperature of a soldering iron is with a microcontroller, using temperature feedback from the thermistor in the handle near the iron's tip. This Design idea presents a soldering iron driver that does this using only analog components. Design by Kiril Karagiozov
Solid State Signal Lamp - This solidstate signal lamp is a good alternative to revolving mechanical signaling lamps used in ambulances. it uses ultra-bright blue LEDs for signaling. However, you can replace blue LEDs with bright...__ Electronics Projects for You
Square Root Function Improves Thermostat - 09/30/99 EDN Design Ideas: Perhaps the most elementary rule of control-loop design theory is that feedback-loop performance is fundamentally linked to the careful choice—and stability—of loop gain. insufficient loop gain leads to poor setpoint accuracy. Too much gain can induce feedback instabilities, Design by W Stephen Woodward, University of North Carolina, Chapel Hill, NC
System Monitors multiple temperatures, controls fan speed - 10/12/00 EDN Design Ideas: The block diagram in Figure 1 represents a complete remote-temperature-sensing and fan-control system. The system uses an Analog Devices temperature-monitor and fan-control ASIC and a PIC 16C84 µC from Microchip Technology. The ADM1022 allows you to measure the local temperature and two remote temperatures within a system. An on-chip, 8-bit DAC controls the speed of a cooling fan in response to the measured temperature. Design by David Hanrahan, Analog Devices Inc, Limerick, Ireland |
