Questions tagged [temperature]

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

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Zener diode as temperature sensor

I am trying to measure the temperature of a battery pack using Zener diodes. I want to use Energus's Tiny BMS 30A. In their battery modules they use Zener diodes to measure the temperature of the pack ...
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35 views

LM317T heatsink junction temperature? [closed]

If an LM317T is dissipating 10W into a heatsink at 90DegC what is the junction temperature?
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Converting temperature to resistance using ITS-90 coefficients

I'm trying to convert from temperature to resistance using the ITS-90 coefficients for an RTD that have been previously generated. I'm using the formulas here: https://www.bipm.org/utils/common/pdf/...
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Low Temperatures Effect on RTC module

How would low temperatures effect the following RTC module? I'm talking around -20 degrees Celsius. It can be seen on the picture that it uses the DS1307N version, which is industrial (-40 to 80 ...
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2answers
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Heating up a nichrome wire, MOSFET got too hot

I'm trying to get a 37 AWG, 0.6mm diameter nichrome wire to reach 300*C so it can heat up inside of an enclosure and according to its datasheet that requires 5A, I cut out enough nichrome wire to ...
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What is the derivation for noise factor using temperature or resistance?

Currently my professor is teaching Fundamentals of Communications for my ECE major and she handed me what is pretty much a copy of something she got from the Internet. Though I don't think the full ...
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2answers
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What low cost LCD can I use in minus -30°C? [closed]

I'm looking for an low cost LCD I can use that can still operate even if they it's exposed by -30°C. Normally, the 1602 LCDs have a minimum operation limit at 0°C. So I cannot use that ... or can I?
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Temperature rise in the inductor?

I have a customized inductor which is of E70 core. I would like to calculate the temperature rise in the inductor. Ac copper loss= 5W, DC copper loss 2.5W, core loss 8W (according to steinmetz). I ...
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1answer
27 views

What is a gel battery rated to temperature wise?

I have a battery (in this case a car battery, but there's other types of batteries also made of gel), and was wondering what they were rated to so the charge is still there for when it's used?
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How do I calculate the temperature rise in the ferrite core?

This question might seem basic but I would like to state it. I would like to calculate the operating/Rise temperature of the ferrite core of an inductor. I am modelling my own bobbins for the core so ...
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Temperature rising for inductors

I have an U type inductor. I'd like to calculate temperature rising on the inductor. I found a formula but the result was approximatly 350-550 celcius, I think that is not possible. Here my formula: $$...
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I made a temperature controller - the PID works but the heater still doesn't work

The setpoint doesn't affect the output voltage to heater. How can I fix my circuit so current goes through to the heater?
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4answers
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How to regulate temperature of an IC/PCB -in a vacuum

I have to regulate the temp of an IC. (70deg. C) The part will be in a vacuum chamber. Electrical connections can pass in-out of the vacuum chamber through a port (plenty of connections available.) I ...
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1answer
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pt100 RTD transmitters not working - two in a row - am I doing something wrong?

I just tried to use two different ones of these RTD transmitters with a pt100 probe (3 wire) with no success. I am connecting the transmitter directly to a 4-20mA input on a PLC, as shown in the ...
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1answer
35 views

Thermador oven circuit board troubleshooting - where to go from here?

I have a Thermador double oven unit that is not working correctly in one of its cooking modes. I have done some troubleshooting, but haven’t located the problem to my satisfaction. I wanted to see if ...
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1answer
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Derivation of formula for temperature coefficient of resistance

https://www.electrical4u.com/temperature-coefficient-of-resistance/ Referring to this article, I'd like to compile two key formulas for the temperature coefficient of resistance. First is the formula ...
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1answer
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What is the meaning of inferred absolute zero temperature? Why does the resistance temperature graph it is obtained from behave that way?

Studying basic direct current circuits, I've come across the term inferred absolute zero temperature on computation of resistances that change due to temperature. Based on my readings, I understand it ...
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1answer
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How can I calculate the worst-case Tj of a MOSFET in discontinuous operation at another Tamb?

I am faced with the task to calculate the maximum junction temperature of a MOSFET in a half-bridge, having conduction losses, switching losses and diode losses. The real difficulty comes from the ...
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1answer
58 views

PID controller for a very wide temperature range (∆T=190°C)

I'm designing temperature control system based on Peltier elements. And it's needed to work on a very wide temperature range - from below zero to more than 100°C. So there is two work modes - cooling ...
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2answers
113 views

Temperature control fails. Will a PID solve the problem?

I made a temperature control system without PID (just on/off with an offset) to control the temperature in a tank. I can only cool the tank with a cooling coil inside the tank (so there is no heating ...
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1answer
47 views

How are analog thermocouple meters calibrated?

In most modern thermocouple measuring equipment, the input is high impedance and approximates a perfect voltmeter. This makes the thermocouple measurement easy because there is no current flowing ...
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1answer
47 views

How can such an equation for the temperature of a *black body* be valid in this case?

I am currently studying The Art of Electronics, third edition, by Horowitz and Hill. Exercise 1.6 says the following: C. Power in resistors The power dissipated by a resistor (or any other device) is ...
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1answer
39 views

Junction temperature calculation

I have a question regarding the calculation of the junction temperature of MOSFETs and IGBTs. An estimation is possible with: $$T_j = P \times R_{th} + T_a$$ Let us assume that the thermal resistance (...
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214 views

AHT10 temperature and humidity sensor does not work anymore

I have used the AHT10 before, I liked it, it worked well. After that I bought new a AHT10 but it is not working with my Arduino. I am using this library. I checked closly, and there is only one small ...
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1answer
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Is tungsten a good conductor of electricity? [closed]

If yes, why does it give off light and heat in a filament? If no, why? Tungsten is a metal, isn't it? My proposition is that it is a moderate conductor, and it happens to be ideal for usage as a ...
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How to use temperature formula of SI7021 using MS LS recieved

SI7021 datasheet. This is the data in ASCII I recieve to my serial communication in Matlab. The first letter is the ASCII for the MS byte, the second is ASCII for the LS byte, then we have the ...
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89 views

LM2596 Heat Sink

I’ve designed a DC-DC step down circuit based on the LM2596 regulator to replace a battery in a project. The circuit steps down a 12V supply to 3.9V and is used to power a module which draws 500mA, ...
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Transmission distance with AM2320 temperature and humidity sensor

I'm about to work with a temperature/Humidity sensor, this sensor has to be wired more than 5m and less than 10 m to my PCB board, I was going to use the SHT3xx sensors, these sensors work with I2C ...
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52 views

Non-Inverting Amplifier

This circuit is for a temperature sensor with its output signal being amplified so as to be better processed. What is the role of RI1 which is the input resistor of the non-inverting pin of the LM358.
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1answer
53 views

MLX90614 breakout board dead

I purchased two MLX90614 boards from aliexpress here. They are both higher accuracy ( GY-906 DAA => 0.2°C, 3V) versions for medical instruments. I tried to hook one to Arduino nano (3.3V) but once ...
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Is the output voltage range of the LMT70 analog temperature sensor fixed regardless of Vsupply?

The differential ADC on my circuit has 1 channel open, and I decided that to place a temperature sensor IC. The temperature IC is LMT70. According to the output voltage table from the datasheet, the ...
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What is the impact of a lower TG for an RF Board?

I have a board that contains a WiFi module (2.4GHz). Does Tg have an effect on RF performance in any way ? If the material can satisfy the other constraints, such as Dk, Df etc.. would the Tg be a ...
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1answer
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Thermistor is accurate on Arduino, but is off by 10 degrees F on wemos d1 mini

I'm new to electronics and followed a simple thermistor tutorial which worked flawlessly. It uses Arduino Uno, a 10k thermistor and a 10k resistor. Now I'm trying to use the exact same circuit except ...
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1answer
72 views

Difference between On-die and junction temperature

What is the difference between junction and on-die temperature. I am using Xilinx Artix-7 FPGA
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3answers
89 views

Controlling for ambient temperature changes in a transimpedance amplifier

I'll start by saying I'm new to electronics, and have only minor working knowledge. I am designing a transimpedance amplifier to measure the opacity of a surface that is changing over time. The ...
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45 views

Total length of cable to connect 1-wire DS18B20 sensors without problem

Based on this topic and the connection that is proposed I would like to make two questions (if somebody has face the same problem/task). So can I connect the data cable to a raspberry GPIO and then ...
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2answers
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Wiring 4-wire PT1000 to MCP3008

Is it possible to read a 4-wire PT1000 using an MCP3008, which is connected to a Raspberry Pi? I can handle the software part; I am looking for how to wire things up. Is this possible after all? Which ...
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1answer
110 views

Wheatstone bridge: Modifications for different temperature sensor resistance

I am trying to build a Wheatstone circuit to detect temperature changes of a low resistance (about 10 ohm) wire. For a first try I would like to use a circuit proposed in this Maxim Application Note ...
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1answer
56 views

Which sensor should I use to recognize just humans? (not all of the obstacles)

I would like to make a social distance meter and the device should only avoid from humans, not the obstacles. I'll use an ultrasonic sensor and a PIR sensor but I'm not sure it will be enough. Do I ...
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1answer
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Issue with circuit board implementing temperature circuit

I have not got a lot of experience with PCBs, but I have moved a breadboard circuit to a PCB and I am seeing an issue. The objective of the board is to sense temperature. When the circuit is on the ...
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1answer
117 views

How to connect 15kΩ NTC thermistor sensor to thermostat which requires 10kΩ NTC thermistor

I have a electric floor heating in my house. Old DEVI thermostat broke down few day ago. Problem is that DEVI thermostats are expensive and a little bit dump (not smart). I want to replace thermostat ...
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1answer
44 views

Calculating maximum permissible track amperage for intrinsic safe PCB

I'm reading IEC 60079-11 standard (Equipment protection by intrinsic safety "i") which discusses how to design intrinsic safe circuit boards. In section 5.6.4 it talks about permissible ...
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1answer
216 views

Thermal pads, their thickness and conductivity

I would like fo know how do thermal pads work, more specifically why does their thickness matter so much even more so than their actual conductivity numbers sometimes and how do I choose the proper ...
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2answers
56 views

Measuring parallel resistor without current

I am trying to read the temperature sensor in a car with a Raspberry Pi. The temperature sensor's resistance changes as the engine temp increases however the temperature sensor would be in parallel to ...
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2answers
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What is the absolute maximum temperature of a ceramic capacitor while not operating? (non-operational maximum)

I'm trying to determine the maximum non-operational limits of my system. The operational limits are easy to determine as they are provided in all of the datasheets for each of my components. However, ...
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How can I use a 2N2222 transistor as a temperature sensor?

I'm supposed to use a TMP36 transistor for a class to read the temperature of the environment, but I only have a 2N2222 transistor; the Arduino will have an analog read of it, but the numbers won't ...
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1answer
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PT100 temperature sensor: meaning of “measuring current” specification

I'm measuring temperature using a PT100 temperature sensor on a Wheatstone bridge. As I'm working on a battery powered application, I'm choosing the resistors in the bridge so that only a small ...
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1answer
34 views

Maths behing implementing temperature compensation on a signal

I have a fluid pressure sensor (blue line) whose measurements are affected by outdoor temperature (yellow line). So there is a 12 hours cyclic component (day/night) in my pressure measurements. How ...
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1answer
44 views

Measuring Discharge Rate of LiPo battery

I am attempting to change the temperature that a 3.7v rechargeable LiPo Battery is discharged in and am seeing how this affects the capacity and discharge rate of the battery. My setup currently uses ...
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0answers
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Creating battery pack with biased thermistor resistor network. How to ground if sensing externally

I designed a battery pack board for a customer that uses a multi-cell low-side (NMOS) protection IC. The protection includes OV, UV, OC, and OT/UT protection for the pack. The Overtemp and Undertemp ...

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