Questions tagged [temperature]

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

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Replacing a thermistor sensor with a common resistor to 'trick' it

Here's the catch: we have a device that has a sensor that helps shutting it down when air temperature is too high. This sensor is based on a thermistor. We are now switching to a more powerful cooling ...
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Highly thermo-conductive epoxies for potting

Some advertise as much as 2 W/mK of thermal conductivity. Free air is no more than 0.03 W/mK at usual temperatures. Air convection I think will be the same in both the potted and unpotted cases. Does ...
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Can a K-type thermocouple measure both air and surface temperatures? [closed]

I want to use a K-type thermocouple to measure exhaust gas temperature and surrounding structure temperatures for my micro turbo jet engine. I read in the comments of How to use MAX6675 thermocouple k ...
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Resistor array datasheet

I'm looking at the resistor array with specifications Temperature Coefficient of Resistance ±100 ppm/°C; TCR Tracking 50 ppm/°C maximum Does that mean that they are resistors with ±100 ppm/°C with ...
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Highest Efficiency/Lowest resulting heat from a DC/DC conversion

I have a 336VDC power source - it's a pretty unique piece of kit and won't be changing it. I'm looking to power around 500W of equipment from it at 48VDC. However, I'm looking to do this using a DC/DC ...
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Why is resistor temperature coefficient given in a +/- number?

For a given resistor you might see a TCR of +/-25ppm/C, but I'm not sure I quite understand that number. As far as I know, a PTC resistor like a basic thick film always increases in resistance as ...
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Temperature sensor noise

I am trying to model a temperature sensor in Simulink. I have a question regarding the modelling of the temperature noise. I was thinking of modelling it as a band limited white noise, but I am unable ...
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Which temperature sensitive material would be a good choice for temperature measurement from 4K to 300K?

I am building a thermometer for a cryostat which operates at low temperatures (until 4 kelvin). I would like to know the temperature of some parts in my cryostat during the cooling (so from 300 K to 4 ...
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Select zener for minimal thermal drift

The voltage of a Zener diode in the Zener breakdown region depends on temperature. Suppose we have 3 Zeners with the following specs: 3.3 V rated Zener voltage at 5 mA 5.1 V rated Zener voltage at 5 ...
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Same part devices supporting different temperature ranges

I just had this question. We often come across microcontrollers having the same internal peripherals and supporting the same functions but supporting different temperature ranges. Can you tell me how ...
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Thermal Protection - NTC + Comparator + Hysteresis

I am looking to implement a temperature protection circuit using an NTC thermistor and a comparator. Was thinking of using a hysteresis design I found in a manual by TI - Do you think that's a good ...
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What can cause a surge in one 110 V line feeding a 240 V appliance, melting the connector?

One of the Hot wire (#10/3) going to my oven appear to have experienced a sudden very high in rise temperature inside the junction box, melted the connector, creating a contact with the face plate ...
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Temperature measurement in strong AC magnetic field

I have a coil that is continously driven with a maximum of 100A RMS of current at a frequency of 20kHz. The coil is water-cooled and I would like to directly monitor its temperature. The temperature ...
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1 answer
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BJT Is Saturation current temperature dependence singularity

So, I am currently looking at the ways transistors change their parameters with temperature according to SPICE for a thorough investigation of synthesizer VCO exponential converter. Particularly, the ...
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How do Li-Ion batteries detect their temperatures?

I know that Li-Ion batteries have specific charging temperature ranges... but how do they detect when they're too hot/cold to charge and prevent the charger from working? Secondary question: a ...
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Calculating how much nichrome wire rod is required to heat aluminium at 490°C [closed]

My purpose is to install nichrome wire rod in an aluminium annealing furnace with capacity of annealing 3800kgs of aluminium. The furnace is well insulated. It has two built in blowers to circulate ...
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Which is better, the MB10S or the MB10F?

I am replacing a blown MB10 rectifier IC on a small LED power supply. The letter could not be read anymore so I don't know which one to get. The S or the F variant. In the datasheet the electrical ...
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Buck regulator thermals calculations

Schematic: Specification: Vin = 24V Vout =5V Iout max = 8A Freq = 0.691 Mhz Assumptions: Good layout and FETs mounted on 1-2 inch^2 of copper. Calculations based on this doc: https://www.ti.com/lit/...
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Can a thermocouple be encased in a custom stainless steel tube?

I would like to read the temperature of oil in a metallic vessel. However I'd like to route the thermocouple so it stays out of the way. Is it OK to just insert the "naked" thermocouple &...
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1 answer
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How to calculate expected temperature of a heating element?

I have a problem. I am suspecting heating mat I got is not working. It is barely warm to the touch, to the point I wonder if I'm imagining it. It's parameters are 230V, 16W, 26.5 x 28 cm. It's flat ...
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Alternative to MLX90614 IR Temperature Sensor : ISB-TS45D?

Has anyone tried using the "ISB-TS45D Infrared Thermopile Sensor" for measuring temperature using Arduino or any other board. I have used the MLX90614 sensor but is is much costlier than ISB-...
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Isolating I2C device behind a switch

I have a piece of closed hardware (proprietary) that has one I2C port. On this port I have two devices, one that requires constant 5 V for counting and the other is a temperature/humidity sensor (also ...
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Furnace circuit ideas: constant temperature with thermocouple & heating element

I am wanting to make what we will just call a furnace that will always operate near 1800°F. I'm looking for circuit ideas or a direction in order to maintain the temperature of the furnace. The ...
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PT100 wiring: use different wires joined together and cable length considerations

I am trying to convert a fridge into an incubator for turtle eggs. I would like to make as little modifications to the fridge as possible (i.e: avoid drilling holes through the styrofoam) so that is ...
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Choosing register value for NTC with voltage divider

I need some help to choose resistor for voltage divider circuit to read temperature using NTC Thermistor. I'm planning to use STM32 with his 12bit ADC. The NTC I'm using has the following properties: ...
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UC3843 PWM Duty Cycle Variation With Temperature

I'm trying to implement a constant current solenoid driver (it's more of a constant wattage pwm driver, current changes with supply voltage which is fine) using UC3843 PWM driver. I'm using the ...
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Intended purpose of temperature sensors inside an IC/microcontroller

What is the intended purpose of a temperature sensor (TS) inside a microcontroller? Of course, you could say it is to measure the inside temperature of the IC, but also depending on the ambient ...
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How many times can I solder/desolder a through-hole component on a PCB?

I am very new to soldering and desoldering and want to try doing it on a mouse's switches. I want to try out multiple different types of switches on the same mouse. I read that the temperature limit ...
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Help identifying scooter hub motor components related to temperature

I got a Jetson Bio scooter because it was not working (still isn't). It exhibited a notchy hub motor when pushed by foot. After taking it apart I found that the MOSFET for one of the motor phases ...
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How to read and identify multiple (8-15 sensors) temperature sensors for a Pi Pico/Zero?

I'm planning to gather data from several Pt temperature sensors: ...
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How I can perform accelerated testing of my PCB board by own?

I am working on a project in which there are system components listed below as module: 8 ultrasonic sensors 12-30 V (Sensor module) 3 DC motors (Drive module) 35 V to 5 V buck converter and a 35 V - 5 ...
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How can I choose the values of comparator resistors?

I have a circuit that I use as a thermostat: My comparator is an LM393. I calculated the reference voltage and the R3/R4 ratio using the hysteresis calculation tool on this site: calculator So I ...
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~3400 ppm/C resistor replacement/substitute?

I am working on reviving an old synth design (Transcendent 2000 for those interested) and the VCO and VCF both rely on high ppm/C resistors to compensate for temperature changes. I can include the ...
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Industrial PT100 temperature transmitter and ESP32 with micropython

I'm building a temperature controller using ESP32s and industrial PT100 temperature transmitters. The transmitter I'm using is this: MUR-HS-U It has selectable temperature ranges and outputs 1-10V ...
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Voltage reference to drive multiple thermistors - high precision with op amp to supply current, or just generic voltage ref?

I would like to drive 8 thermistors in parallel. They will be driven from 2.5V in a voltage divider. This will be about 20mA current draw. I will be using a ratiometric measurement where the ADC ...
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Does NTC temperature measurement need calibration?

I'm creating some temperature sensors for home use. To measure outside and rooms' temperatures. Range from -30 °C to +50 °C. Temperature measurement is based on 10k NTCs SDNT2012X103F3950FTF (B=3950K, ...
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6 votes
5 answers
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Thermocouple wire extension

I want to use a thermocouple (K type) for a PID temperature controller in a heating system. The thermocouple should be pluggable to the system. I decided to use an industrial grade connector like ...
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Case temperature MOSFET

I am going to use a nMOSFET (NTMFS5C670NL) which will a varied power dissipation. The current going from drain to source is determined by a control signal. The maximum power dissipation for the MOSFET ...
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Why did the output voltage of this circuit had the same value no matter what the value for the resistor R2 was

So here is the circuit: R2 is a NTC thermistor (its value changes with temperature) and i want vout, the output of this circuit, to be in between 0.05V and 4.95V, where 0.05V should correspond to R2 ...
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How to (generally) identify a temperature sensor? [closed]

What should be the approach to figuring out what a temperature sensor is, when taking apart an appliance or “reverse engineering”? This has come up in a couple scenarios for me recently: I am ...
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Calculating the change in output voltage as temperature changes the control feedback resistance

I am trying to calculate the new output voltage when the temperature changes the resistance of the feedback network which sets the output voltage. I have this circuit using the MCP16311/2 buck ...
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2 votes
1 answer
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Analysis of power amplifier bias circuit: does it need to be thermally bonded?

I'm in the process of building a medium power amplifier for the 20m band (14MHz) and I'm experimenting with bias circuits. The amplifier is a classic BJT push-pull arrangement with a transformer ...
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Temperature is not increasing after some value (MAX6675) (PID)

I was following this circuit diagram shown above (from https://electronoobs.com/eng_arduino_tut24_sch2.php) to create a 12V heater for heating a hot end using PID. The only thing I'm not using from ...
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Wheatstone Bridge strain gauge thermal compensation design

I'm designing a full Wheatstone bridge for measuring the bending strain in a steel bar. I have a circuit available to me that uses an ADS1232 to measure the output of the wheatstone bridge. When ...
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DALI DT8 tunable white control - novice in need of help!

Completely new to DALI, and I need to control a tunable white luminaire. I have a Hasseb USB to DALI interface (http://www.hasseb.fi/shop2/index.php?route=product/product&product_id=50), which ...
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Understanding questions about MOSFET’s drain and gate series resistor

I build a temperature circuit in PSpice with a TLV3701, a MOSFET and 3 light bulbs (\$R_6\$, \$R_7\$, \$R_8\$). The \$R_9\$ resistor is 108.18 Ω (can be bought, I checked). As soon as the room ...
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Why does gain of my INA2332 change with increase in input voltage?

I'm building an IoT circuit for sensing resistance change using Kelvin's 4 wire. I have implemented a constant current source that supplies my two sensors connected in series with 50 mA. The output ...
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1 vote
2 answers
166 views

MAX6675 k-type thermocouple ADC is giving high readings

I have designed and built a small fairly simple circuit that uses a MAX6675 chip to take temperature readings from a multiplexed array of 16 k-type thermocouples. Datasheets: MAX6675: https://www....
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3 answers
113 views

Are Ethernet magnetics temperature sensitive

I am using these discrete Ethernet transformers ALT4532M-201-T001. According to the datasheet, they are rated for -40ºC to +85ºC. In general for Ethernet transformers, would I expect to see some ...
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Using Thermal Epoxy vs Super Glue for Thermal Couple temperature measuring

Which practice is better for measuring the temperature if a MCU on a PCB with a thermocouple: Measuring on the case of the MCU with thermal epoxy attached to the thermal couple, or super glue? I feel ...
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