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Temperature Controlled NiCad Charger - This circuit is for a temperature controlled constant current battery charger. it works with NIC D, NiMH
, and other rechargeable cells. The circuit works on the principle that most rechargeable batteries show an increase in temperature when the cells becomes fully charged. Overcharging is one of the main causes of short cell life, hot cells pop their internal seals and vent out electrolyte. As cells dry out, they lose capacity. This circuit can quickly charge a rechargeable battery pack without any negative effects. This circuit uses a 22VDC power supply, my version 2 circuit will run from a 12VDC supply such as a solar-powered or automobile power system. __ Designed by G. Forrest Cook
Temperature Controlled Ovens - Here is a simple temperature controller suitable for a variety of purposes; it was designed to heat the copper float out of a toilet for a barometer! __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Temperature Controller (AVR + DS1621) - Wine doesn't like subzero temperatures, and during wintertime, my "winecellar" got pretty cold. There was an electric heating element, but the thermostat was broken, so it was either full burn or nothing. That's how the temperature monitor/controller came to be. it was an obvious task for a small processor and I'vealways wanted to test the Dallas temperature sensors. So, I designed this little device which could monitor the temperature and control the heater. it's based on an AT90S2313 and a Dallas DS1621 Digital Thermometer. The temperature is displayed on a dual 7-segment__
Temperature Controller Drives Peltier Cooler - 06/08/95 EDN Design Ideas: The circuit in "Peltier element controls itself, " by DmitriI Loukianov (EDN, October 27, 1994, pg 86) is elegant, but it suffers from two potential problems that could arise in some applications. The first is possible switching-noise injection from capacitive and inductive coupling at the front end of a sensitive analog-signal-conditioning chain (for example, in a CCD-cooling application). The second potential problem is Peltier-stack performance degradation from intermittent, fast-switching drive current. At least one UK-based Peltier-cooler manufacturer recommends uninterrupted dc drive. Design by Dr Trevor Preston, Cambridge, UK
Temperature controller has "take-back-half" convergence algorithm - 09/15/05 EDN Design Ideas: Enhanced closed-loop control balances stability, responsiveness Design by W Stephen Woodward, University of North Carolina, Chapel Hill, NC
Temperature controller keeps IR Detector at 8ºK - 01/07/99 EDN Design Ideas: Sensitive infrared array detectors must operate at a low temperature to avoid thermally generated dark current throughout the photoconductive elements. This requirement is particularly true for SiAs array detectors, which Page includes several designs. Scroll to find this one Design by Jerry Penegor, Space Sciences Laboratory, University of California—Berkeley
Temperature controller saves energy - 3-Feb-05 EDN Design Ideas: Given the high cost of electrical power, replacing a conventional on/off temperature control with a proportional controller can often save energy and money. Figure 1 shows a low-cost, high-efficiency, time-proportional temperature controller for a residential water heater. An Analog Devices ADT14, IC 1, serves multiple functions as a temperature sensor, quad-setpoint, programmable analog tempe Design by Tito Smailagich, ENIC, Belgrade, Yugoslavia
Temperature Indicator-Cum-Controller - Here is an easy-to-construct temperature indicator-cum-controller that can be interfaced with a heater’s coil to maintain the ambient room temperature. The controller is based on Atmega8535 microcontroller, which makes it dynamic...__ Electronics Projects for You
Temperature Measurement - Measures temperature via SMT160-30, shows it on LCD and communicates with RS232 (sends values of temperature to terminal __
Temperature Measurement using the LTC1090/91/92 Series of Data Acquisition Systems - DN5 Design Notes__ Linear Technology/Analog Devices
Temperature Monitor for Electronic Equipment - As most electronics components’ characteristics vary with temperature, they are selected as per expected operating temperature range of the equipment. So it is important that the equipment stays within the temperature...__ Electronics Projects for You
Temperature Monitor using 741 opamp - A simple op-amp circuit that will trigger a relay when a preset temperature is reached. Please note that there is no hysteresis in this circuit, so that if the temperature changes rapidly, then the relay may switch rapidly. __ Designed by Andy Collison
Temperature Monitoring with an NTC Thermistor While Measuring Load Current & LTC4151 Supply Current - The LTC4151 is a high side power monitor that operates over a wide voltage range of 7V to 80V. in default operation mode, the onboard 12-bit ADC continuously measures high side current, input voltage and an external voltage. Data is reported through the i2C interface when polled by a host. The LTC4151 can also perform on-demand__ Linear Technology/Analog Devices App Note, Apr 26th 2010
Temperature Relay - This simple temperature relay circuit can be used to signal a fire or setpoint for temperature monitoring function. You need to adjust P1 so that T1′s base voltage is 0.5V smaller than the emitter voltage at a temperature a little bit lower than the desired triggering (switching) temperature. if the temperature increases __ Designed by Popescu Marian
Temperature Sensitive MOSFET - 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
Temperature Sensitive Switch For Solar Collector - This circuit can be used to turn the pump on and off when a solar collector is used to heat a swimming pool, for example. This way the water in the collector has a chance to warm up significantly before it is pumped to the swimming pool. A bonus is that the pump doesn’t need__
Temperature Sensor Control - A basic circuit using Diodes to detect temperature differences __ Designed by G.L. Chemelec
Temperature Sensor Doesn't Discharge Battery - 08/01/96 EDN-Design ideas The circuit in Fig.1 is useful for precise, repetitive temperature control of small-volume objects. it offers high resolution and effective isolation between the control lines and the power mains. it generates no RFi, has adequate speed, and provide as a linear relationship between the digital-input code and the average thermal power supplied by the heater. The circuit works by generating a programmable number of triggering pulses to a TRIAC connected in series with the heater Design by Jordan Dimitrov, N Poushkarov Institute of Soil Science and Agroecology, Sofia, Bulgaria
Temperature Sensor MOSFET - 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.. . . Circuit by David A. Johnson P.E.-December, 2010
Temperature Sensor Readout Unit - This is the fully featured, jammed packed temperature readout unit. I can measure temperature from up at 8 DS1820 digital temperature sensors all on the same 1-wire bus. That's right only 3 wires are needed to go to all the temperature sensors, GND, VCC and 1-wire data. All sensors will connect to the same cable! Anyone who has used the DS1820's__
Temperature Sensor Uses I2C Isolator - 6-Jun-96 EDN Design Ideas: You can couple an LM75 digital output-temperature sensor through an isolated i2C (interintegrated circuit] interface (see Reference] as shown in Figure 1. Electrically isolating the sensor allows operation in situations prone to high common-mode voltages; it's also useful in breaking ground loops. IC 1 and IC 2 comprise a bidirectional isolator Design by Jerry Steele, National Semiconductor, Tucson, AZ
Temperature Sensor with 4 to 20ma Current Loop - I designed a circuit similar to this one years ago to accurately measure the air temperature inside a building 1000s of feet from a control room. The circuit uses a very robust current loop method. it uses a highly accurate semiconductor temperature sensor. . . Circuit by David A. Johnson P.E.-July, 2000
Temperature to Frequency Converter - 3% Linearity from –20°C (Fout = 20kHz) to 75°C (Fout = 25kHz) The LTC6990 is a precision silicon oscillator with a programmable frequency range of 488Hz to 2MHz. it can be used as a fixed-frequency or voltage-controlled oscillator (VCO). The LTC6990 is part of the TimerBlox family of versatile silicon timing devices. __ Linear Technology/Analog Devices App Note, Jun 16th 2010
Temperature-controlled 12V DC Fan - Suitable for computer cooling fans. LED motor speed indicator. __ Contact Flavio Dellepiane, fladello @ tin.it
Temperature-Measurement Scheme Uses IR Sensor & Sigma-Delta ADC - 3-Apr-03 EDN Design Ideas: Many noncontact temperature-measurement systems use infrared sensors, such as thermopiles, which can detect small amounts of heat radiation. Biomedical thermometers that measure the temperature of an ear or a temple use noncontact temperature measurement, as do automotive-HVAC systems that adjust temperature zones based on the body temperature of passengers Design by Albert O'Grady and Mary McCarthy, Analog Devices, Limerick, Ireland
Temperature-Sensing Diodes Selector - Low-cost semiconductor diodes such as 1N914, 1N4148 and 1N400X can be used as temperature sensors in applications where high accuracy is not required. They can be mounted on transistors, power diodes, ...__ Electronics Projects for You
Temperature-to-Frequency Converter - Precision oscillator structure uses SCR effect to discharge integration capacitor. A temperature dependent device (LM134) effects the integrator trip point to form a variable interval. An output transistor detects the reset action and forms a logic pulse. __ Linear Technology/Analog Devices App Note, Jun 21, 2011
Temperature-to-period provides linearization of thermistor response - 11/10/05 EDN Design Ideas: Highly accurate pulsewidth varies with temperature Design by
Kaliyugavaradan, Anna University, Madras Institute of Technology, Chennai, India
Tempmaster Electronic Thermostat Mk.2 - Want to convert an old chest-type freezer into an energy-efficient fridge? Or convert a spare standard fridge into an excellent wine cooler? These are just two of the jobs this low-cost and easy-to-build electronic thermostat has been designed to do. it can also be used to control 12V fridges or freezers, as well as heaters in hatcheries and fish tanks. it controls the fridge/freezer or heater directly via their power cables, so there's no need to modify their internal wiring.__ SiliconChip
Thermal considerations matter for Class D Amplifiers - 04/27/06 EDN Design Ideas: A few basic calculations can help you estimate the IC 's die temperature Design by John Guy, Maxim Integrated Products, San Jose, CA
Thermal Shutdown/ Protection - The thermal protection of amplifiers is always a concern, since overheating is a sure way to reduce the life of semiconductors and other components. Where you don't want to use a fan (such as in Project 42 - Thermo-Fan for Amplifier Cooling) , then a complete shutdown can be performed. __ Designed by Rod Elliott ESP
Thermal Techniques in Measurement and Control Circuitry - Linear Technology AN5 __ Designed by Jim Williams - Dec 1st, 1984
Thermally Controlled NiCad Charger - A voltage controlled current (maximum of 1A) is used to charge a NIC d battery. The control voltage is derived from the temperature difference between the battery and the ambient air. The charge current is reduced as the battery heats up. __ Linear Technology/Analog Devices App Note, Jun 21, 2011
Thermistor Preamp - (spice design) __ Designed by Rick
Thermistor Thermometer: LCD Version - This is the 2nd version of Thermistor Thermometer Project done by another group of my student. The 1st version having 4-digit 7-segment LED shows the use of simple display device. For applications that needs text display, this LCD version is more suitable and easy to adapt for many kinds of measuring devices. __ Designed by Wichit Sirichote
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