|
|
|
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 cheap but accurate thermistor as the temperature sensor. ….
[Designed by David A. Johnson] |
|
Microcontroller converts digital-temperature-sensor readings without
floating-point arithmetic - 5-Mar-09 Issue of EDN Convert
digital-temperature-sensor readings without floating-point arithmetic....
[Design Idea by Jordan Dimitrov, Toronto, ON, Canada] |
|
Peltier Coolers/Heaters - A typical peltier device consists of a
number of series-connected Nand P-type semiconductors sandwiched between two
ceramic plates, such that the flow of majority carriers (electrons or
holes)...ASCII format (Circuit design added 9/06) |
|
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 ICs..... EDN is migrating links. This link is not verified.
Search the "title" + "EDN" for new link. |
|
|
|
Program Converts temperature from RTD sensor - 06/05/97 EDN-Design Ideas....
100V, platinum resistance-temperature-detector (RTD]sensor provides an accurate means
of obtaining temperature readings. Platinum sensors have a nonlinear resistance-vs-temperature
characteristic; therefore, for.... EDN is migrating links. This link is not verified.
Search the "title" + "EDN" for new link. |
|
Quad Comparator Regulates Temperature - 10/26/95 EDN-Design Ideas.... EDN is
migrating links. This link is not verified. Google the "title" + EDN for new
link. |
|
Remote Thermometer (page 11) - Remote sensor sends data via mains supply
Temperature range:00.0 to 99.9 °C.... |
|
Resistor Packs Eliminate Temperature Drift - 06/19/97 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
|
Resolving Very Small Temperature Differences with the LTC2402 - DN257
Design Notes (Linear Technology) (app note added 1/06) |
|
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! [Manfred Mornhinweg] |
|
Selecting Temperature Transducers for Data Acquisition Systems 5988-7505en -
Aligent Application Note 1406 (added 4/08) |
|
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.... [G. Forrest Cook] |
|
Simple
microcontroller-temperature measurement uses only a diode and a capacitor -
5-Dec-08 Issue of EDN Discharging a capacitor through the reverse leakage of a
PN junction allows you to measure ambient temperature.... [Design Idea by Andreas
Grün, Wedemark, Germany] |
|
Taking the Uncertainty Out of Thermocouple Temperature Measurement - AN-274
Analog Devices Application Note....[App Note] |
|
Temperature Controled Fan - This circuit controls very accurately a fan of
any size. Just adjust the associated resistors for a different type and you're
all set. The above circuit diagram is for a small cpu-fan, rated 12V at 12mA
current…. [Tony van Roon's circuit] |
|
Temperature Controlled NICD Charger - This circuit is for a temperature
controlled constant current battery charger. It works with NICD, 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. [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! The values and components are not critical;....(electronic
circuit added 8/03) |
| Temperature controller has "take-back-half"
convergence algorithm - 15-Sep-05 Issue of EDN Enhanced closed-loop
control balances stability, responsiveness.... [Design Idea by W Stephen Woodward,
University of North Carolina, Chapel Hill, NC; Edited by Brad Thompson and Fran
Granville] |
|
Temperature controller keeps IR detector at 8ºK - 01/07/99 Issue of EDN
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 Idea by Jerry Penegor,
Space Sciences Laboratory, University of California—Berkeley] |
|
Temperature controller saves energy - 3-Feb-05 Issue of EDN 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, IC1, serves multiple functions as a temperature
sensor, quad-setpoint, programmable analog tempe.... [Design Idea by Tito Smailagich,
ENIC, Belgrade, Yugoslavia] |
|
Temperature Data Logger - (circuit / schematic design added 6/06)
|
|
Temperature Logger for the Fridge - ….must register on this site....
[Published in Elecktor July/August 2010] |
|
Temperature Measurement Circuits for Embedded Applications - AP929
MicrochipThis application note shows how to select a temperature sensor and
conditioning circuit to maximize the measurement accuracy and simplify the interface
to the microcontroller. Practical circuits and interface techniques will be
provided for embedded applications with thermocouples, Resistive Temperature Detectors
(RTDs), thermistors and silicon.... |
|
Temperature Monitor - Using a thermistor in the position shown makes a heat
activated sensor. A change in temperature will alter the output of the opamp and
energize the relay and light the LED. Swapping the position of the thermistor and 47k
resistor makes a cold or frost alarm.... [Andy Collison] |
|
Temperature monitor & fan Controller reduce fan noise - 01-May-01 Issue of
EDN The scheme in Figure 1 reduces system acoustic noise by running system fans
at their optimum speeds for a given temperature. IC1 combines ±1°C-accurate
temperature measurement of three temperatures with automatic fan-speed control of two
channels. A two-wire serial interface allows you to oversee critical temperature and
fan-speed data.... [Design Idea by David Hanrahan, Analog Devices Inc, Limerick,
Ireland] |
|
Temperature monitor measures three thermal zones - 11-Dec-03 Issue of EDN
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 temperature of three separate remote thermal zones (Figure 1).
Multiplexers have resistance, RON, associated with them; the channel matching and
flatness of this resistance normally result in a varying temperature offset....
[Design Idea by Susan Pratt, Analog Devices, Limerick, Ireland] |
|
Temperature Monitor/Controller: AVR 2313/DS1621 - So, I designed this little
device which could monitor the temperature and control the heater… [Jesper Hensen] |
|
Temperature Programmer uses Digital Control - 07/18/96 EDN-Design Ideas....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
|
Temperature Regulator intricate-ms - (diagram added 8/03) |
|
Temperature Sensitive Oscillator - Temperature controlled based on AT89CX051
(added 8/03) |
|
Temperature-measurement scheme uses
IR sensor and sigma-delta ADC - 3-Apr-03 Issue of EDN 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 Idea by Albert O'Grady and Mary McCarthy, Analog Devices,
Limerick, Ireland] |
|
Thermal Cooling Fan Controller - As we begin to enjoy those lazy hazy days
of summer, the most important thing on most of our minds is how to keep cool during
those hot days. For some of us that means turning up the old air conditioner and
sipping on a nice cold glass of our favorite soft drink. However, we often forget
about an equally important.... [Radio Amateur Society of Norwich] |
|
Thermo Alarm - The Th1 thermistor is a regular NTC (Negative Temperature
Coeficient) of about 1000 ohms. But other types will work too. Adjust the
sensitivity with the 20K trim-pot P1. When the thermistor is at operating temperature,
the resistance is high The 330K resistor (R3) is to introduce a little bit hysteresis
back on the basis of Q2 to prevent relay chatter.... [Tony van Roon's circuit] |
|
Thermo Cooling Fan - Use a 12V computer fan to cool your amp. Uses
diode temperature sensor f (added 5/02) |
|
Thermocouple Signal Conditioning Using the AD594/AD595 - AN-369 Analog
Devices Application Note....[App Note]This application note reviews thermocouple
basics and illustrates Circuit designs for thermocouple signal conditioning using the
AD594/AD595. |
|
Thermoelectric Controller scriptable Thermometer - A unified thermometric
controller that can be programmed with simple scripts, integrating the "classic"
thermometer/controller pair. You can build a variety of simple machines with the same
hardware and a different script : a charting thermometer, a vending machine that dials
your number when empty, a leavening cell(added 09/05) |
|
Thermostat Control for Electric Heaters - ….(electronic
schematic added 12/08) |
|
Thermostat for 1KW Space Heater SCR controlled - Here is a simple thermostat
circuit that can be used to control a relay and supply power to a small space heater
through the relay contacts. The relay contacts should be rated above the current
requirements for the heater. Temperature changes are detected by a(added 6/06)
|
|
Thermostat, #2 - The R2 thermistor is a regular NTC (Negative Temperature
Coeficient) of about 1000 ohms. But other types will work too. Adjust the
sensitivity with the 10K trim-pot P1. When the thermistor is at operating temperature,
the resistance is high.... [Tony van Roon's circuit] |
|
Thermostat, #3 - The LM3911 requires only a few resistors and capacitors to
turn it into a full-function temperature controller. The schematic diagram
illustrates the simplicity of the overal circuit. The resistor network
consisting of R1, R2, and R3 are used to provide the set point voltage for the
feedback input of the LM3911.... [Tony van Roon's circuit] |
|
Two Temperature Controlled Relays - These two circuits use Thermistors
(Temperature Dependent Resistors). Circuit No.1 energizes the relay when the
temperature rises above a preset level. Use it to switch things on when it gets hot.
Circuit No.2 energizes the relay when the temperature falls below a preset level. Use
it to switch things on when it gets cold. [Ron J.] |
|
Universal Compensator Neutralizes Temperature Coefficient - 05/25/95 EDN-Design
Ideas....The universal thermal-compensation module in Fig 1 can neutralize the
temperature coefficient of both signs within a �0.6%/�C range. The circuit can
compensate the temperature coefficient of offset voltage, gain, sensitivity, or, in
general, the linear terms of a device's overall temperature behavior. The circuit
consists of a pair of negative-temperature-coefficient (NTC) thermistors, labeled RT,
and of fixed resistors with calculated values that reduce the inherent nonlinearity of
the thermistors.... [Design Idea by Alexander Belousov, Standard Motor Products,
Long Island City, NY] |
|
|
