Temperature is a property of a substance related to the amount of heat energy it contains.

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Why is the Tempreture Range of industrial and military products so high

From Wikipedia the common temperature range for Electrical components is: Commercial: 0 to 70 C Industrial: -40 to 85 C Military: -55 to 125 C I can understand the lower part (-40 and -55) as ...
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0answers
32 views

High Temperature and Humidity lighting system wanted [on hold]

I'm trying to source a lighting system that will be capable of running for a minimum of 12 hours a day, 7 days a week, at temperature of around 80-90°C and at 10-12% humidity levels for a heated ...
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4answers
81 views

Do consumer high temperature RF ASICS exist at 200C?

So at lunch I was browsing Indiegogo projects and I saw this one here It's a wireless meat thermometer, I've seen it in some permutation or another a few times on sites like this. Apparently no one ...
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3answers
328 views

What is the main source of variation between thermocouples of the same type

Thermocouples have stated tolerances [wikipedia]. However, the characteristic behaviour is defined by the materials in contact, so there aren't size or shape considerations as for RTDs. What are the ...
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4answers
43 views

Tap into 4 wire RTD

Is there any way to tap into an existing 4 wire RTD without changing the resistance, and therefore changing the temp that the existing device will read? Here's the scenario. The device is a medical ...
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2answers
45 views

Understanding Thermal Stability and Drift in Linear Regulators

I'm considering 3-terminal linear regulators (LM317, LM350, TL783, etc.) for a power supply that regulates a 150V wobbly DC voltage down to 145V or 140V. My load is like 30-65mA. So, depending on ...
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2answers
43 views

Schmitt Trigger does not go to ground

i would like to create simple circuit to drive an computer fan (12V, 0.5A) is the temperature is above 42 celsius and stop when the temperature decreased below 36 celsius. I am simulating in LTSpice. ...
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1answer
28 views

Temperature calibration for of the shelf sensor nodes

Terminology: sensor node sensor I have been experimenting with of the shelf temperature sensor nodes. The exact device in question is this one. I got the information that to reach the accuracy ...
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4answers
156 views

Can any BJT be used for temperature sensing?

I'm looking for a cheap and easy way to monitor temperatures and came across the Microchip EMC1403 which interfaces to general purpose diodes (or transistors with their base tied to collector/emitter ...
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2answers
65 views

Ways to accurately heat up SMD component(s) on a PCB to a specific temperature?h

I need to calibrate temperature sensors (ADT7481). My DMM can measure temperature with a thermocouple. And I expect it to be reasonably accurate (within ~1.0 Celsius degree). Question at large ...
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0answers
30 views

Estimate kanthal's temperature by power dissipation

I've a bare Kanthal A-1 wire, And I want to Estimate it's temperature, basically to make a °C vs W plot. In this post Thermal resistance is used to do it as: ...
0
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1answer
64 views

How to measure the temperature of a fridge with arduino?

A want to make a system with arduino to measure the temperature of many fridges and send SMS if temperature is over limits. I am wondering how to measure digital temperature without putting wire ...
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0answers
30 views

Arduino input noise control

I have been working on a project to simulate a fire suppression system. Below is a brief theoretical picture of what the project looks like Anyhow, the system is set up into a box, and the system ...
0
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0answers
23 views

Nexys4DDR temperature sensor reading code error

I am trying to read the temperature sensor on my Nexys4DDR board using i2c protocol. My code is outputting all of the leds as 1, thus giving me the default value. Where am I going wrong? ...
0
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1answer
14 views

Lower Power Inductive Heating Circuit Design Questions

I'm trying to design a very low power (<=10W) inductive heating circuit that will heat the work material to 40-50degC. I've seen plenty of Royer Oscillator circuits online (see here: ...
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1answer
42 views

ferronickel temperature coefficient

I'm heating a ferronickel wire, and I need a reliable measurement of temperature, I was using a thermocouple to do this measurement but the wire is cooled when it's touched by the thermocouple so now ...
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1answer
23 views

Marlin temperature update frequency 3Dprinter

I would like to know at what frequency is the temperature information pulled by the marlin software. I have looked into the code but it insn't obvious to me.
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1answer
66 views

Reasons to use an analog temperature sensor instead of a digital one

I'm designing a microcontroller-based system that includes a thermostat. When choosing which temperature sensor to use, I noticed that analog ones have more or less the same power consumption, the ...
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1answer
70 views

Why we put 10Kohm resistor in parallel with 144Kohm that exist inside USB-6008? [closed]

By using LM35 Temperature sensor and USB-6008 a 10Kohm resistor is placed between GND and AI0 and connected to LM35 with a wire to GND and Vout respectively. By refer to Analog Input circuitry in ...
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2answers
81 views

How to maximize microcontroller temperature?

I need to test how hot a specific microcontroller can get in different situations. The goal is to have the microcontroller heat up as much as possible just by using it. I was thinking I'd need to ...
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1answer
22 views

Sensor Performance Analysis

I've recently built a temperature sensor and have been testing it against a reference thermometer in several different scenarios/environments/temperature ranges. My question is, how do I analyse my ...
5
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6answers
1k views

Measure temperature on a moving engine valve: transfer voltage and reading wireless?

I am an automotive engineer with very very little or almost zero electrical/electronics experience. I am working on logging real time temperature values on an engine exhaust valve and mounting a ...
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2answers
96 views

What resistor values should I use for a voltage divider that has to operate at low temperatures?

I'm designing a flight computer for a lightweight pico balloon - it will (hopefully) operate in the upper atmosphere down to around -40C. To keep the weight down, the whole thing is going to be ...
6
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1answer
89 views

How to change the temperature of sub-circuits in LTSPICE

I have subcircuits of a solar cell (resistors and diodes) in LTSPICE. I want to connect the solar cells (sub-circuits) together. However, each solar cell has a different temperature. I can set the ...
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0answers
17 views

Orcad PSPICE Temperature Sweep

I have built a multivibrator oscillator using an op amp circuit (similar to a 555 timer approach) in PSPICE. The output is correct so the entire circuit is functionally working. I am trying to see ...
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1answer
51 views

Simulating a Constant Temperature Anemometer

I am trying to simulate the results I see when using a constant temperature anemometer circuit to sense air flow. An excellent discussion can be found: arduino thermal anemometer. Here is my ...
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1answer
191 views

Circuit reliability, especially tin solder, under wide temperature range -40 degree to +85 degree

We are trying to have our Lab product work in industry environment. One key factor we are thinking about is the operating temperature, since we have never done any environment test before. Our ...
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2answers
69 views

Voltage regulator current and heating

Many texts I read take (Vin - Vout)*Iload i.e the current Iload is I3 in the below figure when calculating temperature of a regulator: But I3 is not exactly same with I1 there is something called ...
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0answers
40 views

Measuring the temperature of copper wire

I'm doing an experiment with copper wire, and I need to be able to measure the temperature of the wire. I've looked into temperature sensors and infrared thermometers, but I'm not sure how to ...
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2answers
49 views

MAX7221 experiencing 40C temperature rise above ambient

Each MAX7221 (2) in my current design is getting very hot. I used the FLIR One to get a general measurement. I observed a 40C rise above ambient. I'm not sure what the root cause is. Perhaps ...
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1answer
22 views

When using conventional means to control a heating element, how does it affect the peak required VA?

This question is similar to two others, here and here, but with a small difference. To allow a bit of context: Suppose I have a winters day with lots of sunshine. I have an off-grid PV system, and ...
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2answers
110 views

Atmels AtSAM3s gets a bit warm running a test code on my dev board. Is there a problem?

I have a dev board developed by myself. I was using At91SAM7S256 but now I'm migrating to it's successor ATSAM3S8B. The MCU on the dev board for SAM3S gets warm. I am searching for someone with ...
3
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2answers
178 views

Micro-controller failure problem as the temperature raises

I'm using at91sam3s8b(cortex-M3) for my project.The hardware board connects to PC using USB port. The firmware contains some cryptographic algorithms (it includes shifts, Xors, memory substitution ...
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3answers
78 views

MOSFET Drain-to-Source Leakage Current over voltage and temperature

I'd like to know what's the characteristic curve of Idss in N-Channel MOSFET transistors over different Vds values at high temperature. As I've checked datasheets (like Fairchild's 2N7000 or ...
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1answer
245 views

AD620 in Proteus: timestep too small

I've made this circuit in Proteus, as a part of a practice report: In real life it works, as I built and tested it. But in Proteus, when I want to run the simulation, I get these errors: ...
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0answers
54 views

LM35 and OA741 to measure temperature

I am following this tutorial. http://8051funkey.blogspot.com/2014/08/temperature-sensor-using-741-opamp-lm35.html?m=1 It isn't quite working. My circuit always show the red light. My question is how ...
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0answers
69 views

AM2302/DHT22 outputs strange values

I bought a couple of AM2302/DHT22 (temperature and humidity) sensors, which should have an adequate accuracy (2-5%RH and 0.5°C). After testing them indoors for a while now, I am quite disappointed, as ...
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votes
1answer
63 views

What is an acceptable temperature rise for a Mosfet?

I will be using driving N-channel Mosfets with 5v PWM to switch 24v 2A(per channel) LED strips. I will use four per strip (RGBW) and have 6 strips, totalling 24 Mosfets on the PCB. I am looking at ...
11
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5answers
2k views

Electronics in high temperature - operating 30 mins - 2 hours, up to 500 °F - possible?

Would electronics survive if the ambient temperature of the environment was between 120 °C (250 °F) and 260 °C (500 °F) and the operating time was between 30 minutes and ...
2
votes
4answers
94 views

What is more accurate, thermistor's R-T table or Steinhart-Hart equation?

If I want the conversion of thermistor's resistance to temperature to be as accurate as possible, should I refer to a table or use the Steinhart-Hart Equation? I am in doubt because a table contains ...
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2answers
50 views

How to determine temperature with LSM303DLHC

I am using a LSM303DLHC and am very confident I have the I2C communication working well. I am now trying to use the devices 12 bit temperature sensor. The datasheet is not clear and the tech ...
6
votes
1answer
76 views

MOSFET power dissipation calculations - Diodes Inc. datasheets

Looking at Diodes Inc. datasheets, I am having trouble following their power dissipation limit calculations for their MOSFETS. E.g. for DMG4496SSS http://www.diodes.com/_files/datasheets/ds32048.pdf ...
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1answer
34 views

L293DD overtemperature protection

I am using an L293DD Dual H-Bridge IC to power my DC motors. I have realized I am using inadequate heatsinks, and 1,5 times the nominal maximum current(1,8A instead of 1,2A), but the circuit is ...
2
votes
4answers
92 views

I have three DS18B20's. I can't tell if any of them are working correctly

I have three DS18B20's (or I believe at least two of them are DS18B20's). I am currently reading them through an embedded Linux board (Raspberry Pi in this case). I have two of the sensors in a ...
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2answers
76 views

MOSFET Heat dissipation question

I'm designing an RGB LED strip driver, and for the MOSFETS for the PWM power switching I'm looking at using the PSMN022-30PL. It has a voltage limit of 30v, and can supply up to 30amps, which is more ...
2
votes
0answers
136 views

How to find replacement for a discontinued thermistor component?

I am in need of a thermistor with characteristics, such as those of now discontinued KTY84-130 (link to datasheet). I am after the exceptional linearity it features and also temperature range, up to ~ ...
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1answer
45 views

Room Temperature sense in a box

I have a sensor board placed in box with an ESP8266 and 220V to 5V adaptor board which both are considerable heat sources. But sensor is very far away from them at least 5cm. When I do not close the ...
3
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2answers
104 views

PT1000 2 wire probe. Can I add third wire?

I'v got 2 wire (81 cm) PT1000 probe which I want to utilize in a project. I would like to use current source and couple of opamps to make the measurement through ADC (uC) just like described here: ...
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2answers
70 views

Keep a Relay ON until Switch closes

Im trying to fix an egg incubator, currently has a mercury switch (when the temperature reaches two points on the glass, the mercury completes the circuit, it has small holes and some metallic strips ...
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2answers
86 views

Burning Temperature of Copper Winding of Motor

Burning Temperature of Copper Winding of Motor. I Have 3 motors 150watt 0.75Amp 220V in Copper and Aluminum and Copper clad aluminum. I want to know the maximum internal temperature of these motors ...