Skip to main content

Questions tagged [temperature]

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

Filter by
Sorted by
Tagged with
1 vote
0 answers
5 views

Ultrasonic Piezo Crystal properties, temperature and phase

I have a pulse consisting of sine waves driving a piezo transducer at around 120kHz into a gas. If the gas temperature remains constant, but the temperature of the piezo changes how will that affect ...
Dirk Bruere's user avatar
  • 13.8k
0 votes
1 answer
35 views

Temperature Sensor Auto

I'm trying to make a temperature sensor for a Golf MK2, with an LM3914N to light an LED bar with 10 LEDs and in the signal I'm using a voltage divider for R2 to be the temperature sensor that operates ...
Joel Pedrosa's user avatar
1 vote
2 answers
84 views

Temperature dependent characteristics of a diode

I understand why the forward voltage decreases in the diode due to the increase in temperature (since the intrinsic carrier increases and that decreases the voltage since intrinsic carrier and the ...
Fredrick's user avatar
  • 137
1 vote
2 answers
72 views

Which component is likely raising the temperature measurement on my BME680 sensor board?

I have integrated a BME680 temperature, pressure and humidity sensor on a PCB with NL27WZ17 Schmitt triggers (U3 & U4), a RT9193-33GB LDO regulator (U1) and a CM1224-04SO ESD diode (D2). I also ...
Tommy95's user avatar
  • 179
0 votes
0 answers
53 views

Weird SRAM failures when heat is applied to the system and when probed

I'm providing assistance on a project that is encountering some interesting behavior on an SRAM memory device when environmental temperature goes up or when someone probes/touches lines associated ...
Oscyzilla's user avatar
  • 107
0 votes
0 answers
57 views

How do I handle up to 40 Amps continuous current in an ESC (Electric Speed Controller) for my PCB? Specifically heat generation

I have an electric longboard that can consume up to 40 Amps continuously. Here is my schematic: I have a couple questions. Do both the high side and low side MOSFETs experience the same heat ...
Trev347's user avatar
  • 1,062
0 votes
1 answer
37 views

Carrier concentrations versus temperature and doping in Matlab

I am currently self studying structure of semi-conductors and I would like to make a graph in Matlab of the number of carriers as a function of temperature and doping. Let's say that I am testing ...
Homer Jay Simpson's user avatar
2 votes
4 answers
915 views

PT1000 drifts more than 100°C

I'm using a PT1000 and MAX31865 to measure the temperature inside a machine. Electronics (MAX31865 and MCU) are inside an isolated box. The PT1000 is outside and connected in two wire configuration (...
Felix Kunz's user avatar
2 votes
2 answers
83 views

Simulate hall voltage as a function of temperature in LTspice

I'm trying to simulate how temperature affects voltage sensitivity in my hall sensor from LTspice. How do I make use of this equation to get my correct output? Any feedback will help, thank you. I ...
Arl's user avatar
  • 21
2 votes
2 answers
74 views

What's the purpose of temperature ratings of conductors (wires)?

In countries governed by the NEC (like the US), insulated wires typically have insulations with 60, 75 or 90°C temperature rating. Wires have listed ampacities based on their insulation and other ...
alejnavab's user avatar
  • 1,019
0 votes
0 answers
43 views

Batteries safe for use in low-pressure conditions

I want to create a device for use in skydiving. Why when there are ready-made solutions? Because I am a skydiver and an electronics hobbyist, I would like to create something myself and experiment ...
darkanzali's user avatar
0 votes
1 answer
45 views

How to best relate a case temperature measurement with the actual junction temperature?

If I have 4W of power dissipated through a transistor (as derived from measured current and the datasheet's on-resistance) and I measure 40 deg. C on the case of the transistor, what is the best way ...
plu's user avatar
  • 713
0 votes
2 answers
84 views

Thermistor misreading

I'm currently working on a hotplate project with an ESP32, utilizing a 10k ohm NTC thermistor (B57550G1103F000) capable of measuring temperatures up to 300°C. However, I'm encountering issues with ...
Loic Daigle's user avatar
6 votes
3 answers
1k views

Cooling fan direction

I am building a temperature controller. The controller is built in a metal rack mount chassis. The components inside the controller generally consist of ACDC power supplies, an arduino and small ...
Open_Hamster3337's user avatar
0 votes
0 answers
46 views

Lumped parameter thermal network model of a motor (LPTN)

I'm interested in designing a lumped parameter thermal network model for an electrical motor, in order to estimate the motor coil's temperature during transients. I know that a simple first order ...
MichaelB's user avatar
0 votes
1 answer
29 views

Can I treat the thermal shock test temperature as the continuous operating temperature of a conformal coating?

We are using this conformal coating on our design, HumiSeal 1B73EPA. However, it does not state in the datasheet the continuous operating temperature for the coating, only the thermal shock test ...
Never's user avatar
  • 100
2 votes
2 answers
176 views

Using solder to extend RTD cable?

I have a 3 wire RTD sensor (Pt100). The leads coming off of it are not long enough to reach our temperature controller. I bought some RTD extension cable (3 wire) from the same company. Is it okay to ...
Open_Hamster3337's user avatar
1 vote
3 answers
167 views

How do people ground cable shield on thermocouple cable?

I am building an electronic controller that measures the temperature on a metal chamber. Type K thermocouple sensors are placed on the metal chamber, and type k thermocouple extension cable connects ...
Open_Hamster3337's user avatar
0 votes
1 answer
34 views

Analog Microelectronics ASM 5915 pressure/temperature sensor coding problem

I'm trying to use an Analog Microelectronics ASM5915-1000-D pressure/temperature sensor with a Raspberry Pi Pico running CircuitPython. I'm communicating with the device using I2C, and getting data ...
writes_on's user avatar
  • 101
0 votes
2 answers
62 views

Thermocouple vs NTC

I want to test the accuracy of the NTC soldered in a current sensing board with a shunt resistor. For that, I attached a thermocouple type K to the junction of the shunt using epoxy and applied a ...
404's user avatar
  • 15
1 vote
0 answers
47 views

Max operating temperature for PCB/Chip antennas

I'm looking for an antenna (PCB or chip), which I'd like to install in an environment that can exceed 110°C. Here are my questions : Should I trust the temperature ranges given for antennas? The ...
Juno's user avatar
  • 93
0 votes
3 answers
652 views

How "Zero" is this supposedly Zero-TCR resistor? And how much better is it than this other one?

I found a resistor at Digikey, and the TCR was quoted as being 0.0ppm/°C, and I had to check the datasheet just to refute my suspicion that it was a data entry error, and it looks real, but just how ...
MicroservicesOnDDD's user avatar
0 votes
0 answers
27 views

Cold junction temperature measurement in Multichannel Thermocuple

In a multi-channel thermocuple signal conditioner (for example, 5 channels on a single PCB), should I add 5 separate junction temperature measurements to the thermocuple input of each channel to ...
Electronx's user avatar
  • 756
0 votes
0 answers
37 views

NXP and TMP75 I2C communication

I'm trying to read temperature from TMP75 sensor using NXP family microcontroller. I'm able receive proper temperature data, but with Send() command I'm getting errors in my handling procedure. I've ...
Witnes's user avatar
  • 101
4 votes
1 answer
829 views

LTspice: simulating temperature

I want to simulate the effect of temperature on a semiconductor. I can use .temp ... or .option temp ... or ...
hennep's user avatar
  • 393
6 votes
1 answer
496 views

Is it wise to determine heating element temperature from resistivity?

Context I'm making an electric furnace for melting metal, and aiming to make my own controller. Everyone seems to just use thermocouples and a control loop, I thought perhaps I could just measure the ...
TrisT's user avatar
  • 355
0 votes
0 answers
63 views

STM32F031 HSI clock temperature impact

I developed an electrical board that contains a STM32F31C4T6. The product worked well for more than two but since this summer I have customer feedback on malfunctions of the card, it no longer works ...
Kolia's user avatar
  • 55
0 votes
1 answer
73 views

Estimating GaN HEMT junction temperature

I think it's quite a simple question, but the solution is not so obvious for me. I know the equation Tj=Ptot×Rth+Ta, the thermal resistance Rthj-a and RDSon temperature dependance come from the ...
Den's user avatar
  • 11
0 votes
2 answers
141 views

Can a chip be damaged if it goes above operating temperature while running?

An image sensor I'm using has the following temperature spec: Absolute Maximums: Ambient storage Temperature Max: 125°C Recommended Operating Conditions: Stable image temperature Max: 50ºC ...
Rocketmagnet's user avatar
  • 27.5k
1 vote
1 answer
74 views

How to derive thermal time constant from a MOSFET's datasheet?

I use the Vishay SiA440DJ MOSFET in a PMSM inverter. For thermal simulation in Maltab/Simscape I need to provide thermal data. On pg. 1 of the datasheet the thermal resistance Junction to ambient = 80 ...
hanss's user avatar
  • 147
1 vote
1 answer
192 views

How does temperature affect ripple current parameter in electrolytic capacitors?

A maximum ripple current declared, for example, at 100 kHz and at a temperature of +105 ℃ for an electrolytic capacitor, if estimated at a temperature of +85 °C, how much does it increase? What order ...
Coriolanus's user avatar
0 votes
1 answer
137 views

Temperature control with Peltier device and temperature controller

I am working on realizing a temperature controller using an Peltier device, H-bridge and temperature controller. My temperature controller has a PWM duty cycle that (at 20 kHz) goes from -1000 (...
Jasper's user avatar
  • 1
0 votes
0 answers
36 views

How does current flow in this temperature protection circuit?

Reading through the data sheet for a TP4056 Li-ion battery charger, I found the diagram of a typical application. I'm trying to fathom how the temperature protection circuit functions. I've found this ...
nohatsatthetable's user avatar
1 vote
1 answer
180 views

Configuring LM35 to read below 0 degrees C

I read online that the LM35 has a temperature range of -55°C to 150°C, but when testing I found that it was unable to go below 0°C. This is the code I've written to read from the temperature sensor. I ...
Shane Holmes's user avatar
0 votes
0 answers
35 views

How to estimate the temperature rise in an enclosed space due to power dissipation? [duplicate]

I am planning a battery maintenance system that discharges a battery to a storage-compatible state of charge if the battery is not used for some time. I would ideally like to dissipate 4kWh over 15 ...
ARF's user avatar
  • 5,219
1 vote
0 answers
74 views

Is it possible to display DHT11 on a 4 digit-7-segment with a PIC16f877A?

I'm trying to display the temperature of the DHT11 on a 4-digit-7-segment. I simulated it on Proteus and the result always equal to 0. I wonder if the way I used timer to display the LED affected the ...
stevievei's user avatar
0 votes
0 answers
106 views

Different result displaying LM35's temperature on a 4-digit 7-segment using PIC16F877A versus Arduino

I'm working on a project using a display LM35 using PIC16F877A but the room temp was measured around 70°C. I tried using this LM35 with Arduino and it showed result around 40°C. I used a multimeter to ...
stevievei's user avatar
0 votes
1 answer
396 views

NTC layout for MOSFET temperature sensing

Here is a picture where there is a NTC (RT501) that is surrounded by a solder ring connected to the copper pour of the drain of the MOSFETs. Any reason why the layout the way it is with the ring? Also ...
EarthLord's user avatar
  • 597
2 votes
2 answers
316 views

Step up circuit burns protection diode

I have implemented a step up circuit using an IC. I implemented the component selection from the datasheet. This is its datasheet. Image source: LCSC - AZ34063U datasheet The step up feeds an H-...
user1584421's user avatar
  • 1,369
1 vote
1 answer
90 views

Why is the DHT22/AM2302 sensor output value divided by 10?

The divisor of 10 in the signal processing formula, where does it come from? source: https://labprojectsbd.com/2020/05/17/how-to-interface-dht22-am2302-rht03-sensor-with-pic16f877a/
Angga Amalul Ahli's user avatar
0 votes
0 answers
157 views

LTspice temperature

Is this rightly done when doing in LTspice? Find out the effect of temperature in the range of -20°C to +100°C on the magnitude of the value of one of the resistances if its: a) the linear coefficient ...
Filip's user avatar
  • 25
0 votes
3 answers
100 views

Testing component temperature with IPA and thermal shock

Not infrequently a question will be asked on this site about components that are hot to the touch. I generally consider hot to the touch to be about \$140^{\circ}\$ F or \$60^{\circ}\$ C. While I, ...
Math Keeps Me Busy's user avatar
0 votes
0 answers
73 views

low frequency ripple current RMS amps and temperature rise in MLCC

Manufacturers only specify this metric of 0.1, 0.5 and 1MHz. Is there any way to calculate / estimate the temperature rise in these capacitors for much lower frequencies, in the Hz range, based on ...
kellogs's user avatar
  • 1,061
2 votes
1 answer
134 views

Soft latching power circuit stops working after heating

I implemented the below latching power circuit (can be found here https://circuitcellar.com/resources/quickbits/soft-latching-power-circuits/) that has 1 button to turn the circuit on and is turned ...
ruben's user avatar
  • 33
1 vote
1 answer
40 views

TC1046VNBTR: Temperature Sensor output has an oscillation

I am utilizing the Microchip TC1046VNBTR on my PCB to measure ambient temperature of the board. I am trying to get a reasonably accurate reading (2-3 °C accuracy). I am using a basic setup based on my ...
Kyle Muehlegg's user avatar
10 votes
5 answers
2k views

Thermal relief for a chip without metal plate on the bottom

I have a chip in which I have selected this footprint: Package_SO: SOIC-8_3.9X4.9mm_P1.27mm. This is what it looks like: Because this chip gets pretty hot, I ...
user1584421's user avatar
  • 1,369
0 votes
4 answers
239 views

Is it better using NTC or a proper temperature sensor?

I need to sense temperature for a lithium battery pack and a TO-220 package transistor. Would an NTC with voltage divider be ok or is it better to use a sensor like the LM36? Note: Measured ...
Hazardous Voltage's user avatar
5 votes
3 answers
1k views

Capacitor and LDO voltage regulator gets really hot on circuit board

THE PROBLEM: I used this LDO voltage regulator (SOT223 package) with a 4.5 V input from 3 AAA batteries to provide a steady 3.3 V as output for all the other components. The voltage regulator, C7 and ...
Ammar Yasir's user avatar
2 votes
3 answers
825 views

Sending a float type values over CANBUS

I need help in sending float-type values over CANBUS. I'm working on data acquisition of an fsae car. I'm using Teensy 4.1 and Teensy 3.5 using MCP2562 and MCP2551 CAN transceivers (respectively) to ...
megahgan's user avatar
1 vote
1 answer
95 views

PCB design around HTU21D and HTU31D temperature sensors

I'm currently designing a IoT device based on an ESP32. This one comes on a mainboard where HAT could be plugged in (nothing new here). The current HAT I'm working on is a temperature and humidity ...
Thibaut Delguste's user avatar

1
2 3 4 5
22