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Thermoelectric Cooler Temperature Controller for Fiber Optic Lasers - AN89 Linear Technology This App Note presents circuitry for maintaining 0.01°C temperature control of fiber optic lasers over wide ambient range variations. The circuitry also features high efficiency power delivery, compact size and low noise. Detailed descriptions of circuitry and results are given with special emphasis on rmal loop optimization. An appended__ Linear Technology/Analog Devices
Thermoelectric cooler unipolar drive achieves stable temperatures - 3-Dec-07 EDN Design Ideas: Depending on the direction of current flow, Peltier devices can both heat and cool Design by W Stephen Woodward, Chapel Hill, NC
Thermoelectric Generator to 2.4V Super Capacitor Charger - The LTC3105 is a high efficiency step-up DC/DC converter that can operate from input voltages as low as 200mV. A 250mV start-up capability and integrated maximum power point controller (MPPC) enable operation directly from low voltage, high impedance alternative power sources such as photovoltaic cells, TEGs (thermoelectric__ Linear Technology/Analog Devices App Note, Oct 26th 2010
Thermometer & thermostat - for Room temperatures __ Designed by Richard Torrens
Thermometer with Four-Digit LED Display - Until recently, the Philips SAA1064 LED driver IC has been a sort of unofficial standard for driving seven-segment LED displays. it can be used to implement four-digit displays that can be driven over an i2C bus. must register on this site __ Designed by Published in Elecktor July/Aug, 2010
Thermometer-Thermostat - This is a simple thermostat that I designed to use with my central heating system. When is not in use acts like a thermometer. The prototype uses the AT90S2313 but it’s obsolete now, so I changed it with the pin to pin compatible ATtiny2313 (the photo shows my first prototype). __ AVR Projects Dim
Thermostat - OK - so I admit is. This circuit is the same as the last one! Here is a practical use for the Schmidt trigger. __ Designed by Richard Torrens
Thermostat (1N4148) - Temperature controlled fan with diode temp sensor. This circuit controls very accurately a fan of any size. Just adjust the associated resistors for a different type like the R6 resistor of 100 ohm, 2 watt type and you’re all set. The above circuit diagram is for a small 12 volt fan, the size and type determined by the user. __ Designed by Tonny Von Roon
Thermostat Control for Electric Heaters - One Advantage of these two units is the Sensor can be placed Away from the heater, therefore sensing the Actual Room temperature, not the direct heat from the heater. These can also be used in a confined space with a Heat Lamp, to create a Drying Oven __ Designed by G.L. Chemelec
Thermostat for 12v Cooling Fan - This circuit will turn on a 12v DC powered cooling fan when the air temperature reaches a certain high temperature and will keep the fan turned on until the temperature drops below a second lower level. Both the high and low temperatures are both adjustable . . . Hobby Circuit designed by David Johnson P.E.-February, 2011
Thermostat for 1KW Space Heater (SCR controlled) - Below is a thermostat circuit I recently built to control a 1300 watt space heater. The heater element (not shown) is connected in series with two back to back 16 amp SCRs (not shown) which are controlled with a small pulse transformer. The pulse transformer has 3 identical windings, two of which are used to supply trigger pulses to the SCRs, and the third winding is connected to a PNP transistor pair that alternately supply pulses to the transformer at the beginning of each AC half cycle. The trigger pulses are applied to both SCRs near the beginning of each AC half cycle but only one conducts depending on the AC polarity. __ Designed by Bill Bowden
Thermostat Node Schematic - Circuit Only __ Designed by Ed Cheung
Thermostat with Adjustable Hysteresis - Switching Circuits: This small thermostat allows you to select the size of its hysteresis. You can set both the temperature at which the relay will energize - and the temperature at which the relay will de-energize. The difference between these two temperatures is the hysteresis. __ Designed by Ron J.
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 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 PIC 18F1320 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/DS18x20 "1-Wire" sensor. __ Designed by D. Thorpe, 2006
Transistor Forms RS-232C Digital Thermometer - 05/09/96 EDN Design Ideas: An ordinary transistor can serve as an uncalibrated temperature sensor (Figure 1) for an accurate, PC-compatible thermometer. Unadjusted accuracy is more than0.5°:C over the -50 to +50°C range, and the only limitation on resolution is the time devoted to measurement acquisition Design by WS Woodward, University of North Carolina—Chapel Hill
Transistor junction monitors remote temperature - 06/22/00 EDN Design Ideas: The circuit in Figure 1 uses a regular, general-purpose transistor as the sensing element and a thermal-diode monitor IC to measure temperature. The ADM1021 usually connects to an on-chip thermal diode on a CPU die itself, but in this application the sensor connects to a regulator low-cost discrete npn transistor, the 2N3904 Design by Matt Smith, Analog Devices, Limerick, Ireland
Transistor junctions monitor temperature zones - 12/31/69 EDN Design Ideas: A simple circuit uses transistor junctions to monitor multiple temperature zones. The temperature sensors are ordinary, general-purpose, low-cost, diode-connected transistors. The well-known diode equation VBE = (kT/q) 'ln (IC /iS) shows that there is a temperature dependency of approximately 2.2 mV/°C for a base-emitter junction. __ Circuit Design by Matt Smith, Analog Devices, Limerick, Ireland
Transistors offer thermal protection for controller - 07/19/01 EDN Design Ideas: When a switch-mode power-supply controller, such as On Semiconductor's NCP1200, operates at a high ambient temperature, you should protect the entire power supply against lethal thermal runaway. The NCP1200 operates directly from the power mains without an auxiliary winding; therefore, the die in the IC dissipates power (Figure 1) Design by Christopher Basso, On Semiconductor, Toulouse, France
Two-Terminal Temperature-to-Current Thermometer Suitable for Use at the End of Long Wire Runs - Adding the LT3092 to a thermistor kit along with three 0.1% accuracy resistors and one final trim, a very accurate 2-terminal temperature-to-current converter can be built. This circuit measures 700μA operating current at 0°C, dropping by 2μA every degree until 100°C, at which point the current measures 500μA. The obvious__ Linear Technology/Analog Devices App Note, Oct 26th 2010
Type K Thermocouple Signal Conditioner with ±190V Protection from Accidental Contact & Cold Junction Compensation - Thermocouple wires are intended to be electrically floating in order to detect temperature by producing the Seebeck voltage created by two dissimilar metals. This small voltage is amplified to an easily measurable level by an amplifier. To protect the input terminals of the amplifier in the event that the thermocouple is shorted __ Linear Technology/Analog Devices App Notes, Mar 16th 2010
Type K Thermocouple Signal Conditioner with ±350V Protection from Accidental Contact & Cold Junction Compensation - A high input impedance amplifier permits the use of large valued input resistors and retains signal accuracy. This is very useful for protecting both the amplifier and cold junction compensator in thermocouple applications as the sense element can often be inadvertently connected to destructive voltage potentials. The 1MΩ __ Linear Technology/Analog Devices App Notes, Mar 16th 2010
Ultraprecise Instrumentation Amplifier Makes Robust Thermocouple Interface - DN302 Design Notes__ Linear Technology/Analog Devices
USB 2.0 temperature sensor needs only a handful of parts - 05/24/07 EDN Design Ideas: A USB-to-serial converter forms the heart of an accurate USB temperature sensor Design by Silvio Lauckner, Ismaning, Germany
USB link neatly measures temperature - 26-Oct-00 EDN Design Ideas: Figure 1 shows a convenient and neat way to measure temperature using the USB of a PC. An ADM1023 IC senses the temperature, and an Anchor Chips EZ-USB. PDF contains several circuits, scroll to find this one. Design by Mary Burke, Analog Devices, Limerick, Ireland
Use Thermoelectric Coolers with Real-World Heat Sinks - 04/17/08 EDN Design Ideas: When using a Peltier thermoelectric cooler with a less-than-perfect heat sink, you must derate the maximum voltage and current applied to the cooler Design by W Stephen Woodward, Chapel Hill, NC
Use Thermostat as 12 Volt Timer - Find out how an old battery powered thermostat can be used as a low voltage automatic timer. __ Designed by REUK-Renewable Energy UK website
Weller WLC100 Electronic Soldering Station - One day you switch on your soldering station (in my case a Weller WLC100). You flick the switch and the red light comes "ON", indication power is okay. Ten minutes later you get ready to solder and find the soldering pencil is not hot at all. What the?! After the usual frustration period of confusion and bad words you decide to investigate and fix the problem. After all, you are a techie or technical inclined and you can 'fix anything'. Right?. __ Designed by Tony van Roon VA3AVR
Wet Bulb Psychrometer - The LTC2990 is used to monitor system temperatures, voltages and currents.__ Linear Technology/Analog Devices App Note, Oct 26th 2010
Wind Direction & AirFlow Measurement - 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
Wireless Digital Thermometer for Multiple Sensors - A lot of remote sensing thermometers have a problem with measuring more than one temperature at a time. To overcome this problem, a different technique is adopted here, which allows you to...__ Electronics Projects for You
Wireless Temperature & Humidity Sensor with USB - this project is based on obdev's Remote Sensor example and their firmware-only USB implementation; the main change is the replacement of the analog sensors with a Sensirion SHT11 digital temperature and humidity sensor__
Wireless Temperature Monitor Has Data-Logging Capabilities - 01/19/12 EDN Design Ideas: You can make a wireless temps system with two IC s. You can use a local temperature sensor and an ASK (amplitude-shift-keying) transmitter/receiver pair to design a simple wireless temperature-monitoring system with data-logging capabilities. A microcontroller processes and displays the temperature reading to the user. The microcontroller’s onboard UART (universal asynchronous receiver/transmitter) also allows for data-logging applications Design by Tom Au-Yeung and Wilson Tang, Maxim Integrated Products, Sunnyvale, CA
Wireless Weather Station. Part 1 - in the Midwest, the main topics of conversation may include the local football team or how the crops are doing. inevitably though, the conversation always leads to the weather. Most of us take the weather for granted __ Designed by Jerry Wasinger |
