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# Questions tagged [temperature]

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

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### Does the temperature affect the working of a PCB circuit? [closed]

I use an MP2305DS to convert 12V 5A to 3.3V 2A. The PCB is in a standard IP68 box. Does the temperature affect the operation of the PCB circuit?
48 views

### Temperature of radial electrolytic capacitors

I have been building boost converters. My current revision is working well at about 300 W, 55 V in to 86 V out. The main problem I now face is that the output capacitor is getting quite hot. If I ...
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### Will the equation result in higher junction temperature if adding a heat sink?

The formula below demonstrates the relationship between power absorbed and thermal resistance. I feel confused. Won't adding more heatsink result in higher junction temperature according to the ...
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### Temperature protection in an SMPS

In some power supplies there is OTP functionality mentioned as in the example (from this datasheet) below: In this case, what does 80°C mean? Does it mean the PSU output will shut down when the ...
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1 vote
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### What kind of temperature would I get with XL4015 voltage and ampere regulator converting 12 V to 6.5 V?

I have a guitar amplifier (Blackstar ID Core 10 v2). Its power brick has gone bad last year, and I have been searching for a power brick ever since. This device works with 6.5 V, 3 A DC. It is pretty ...
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### What happens if high via current flows in PCB?

If I used a via of 8 mils diameter with 20 um thickness. As per sierra tool calculator it can carry current of 1 A at 10 degree rise in temperature. What happens if the current is more than 1 A? When ...
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1 vote
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### Tuning motor temperature

I have a DC motor, running in two modes, slow and fast. I will need to run the motor in FAST mode only. The motor is already running for 10 years. The motor experiences variable load. According to the ...
1k views

### Ultra simple oven controlled resistor for analog temperature control

Background: We're having a problem with a sensitive analog circuit. It has an analog supply voltage from a LT3045 Linear Regulator, whose output voltage is set by an external resistor. We're using ...
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### Rise in temperature of MOSFET [closed]

How to calculate rise in temperature of IRF3205PbF MOSFET if Vds=10v and Ids=5 amps?
610 views

### How to map equivalent AWG wire gauge to PCB trace width?

There are some online calculators that let you calculate trace width based on PCB trace characteristics e.g. this one from digikey. If there is a terminal connector on the PCB that connects solid AWG ...
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### L7805CV operating temperature

I have an L7805CV powering an Arduino and a serial communication chip from a 12 V supply. Nothing else is powered by the L7805CV as the LED strip is powered via a TIP120 transistor and 12 V. However, ...
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### Inrush NTC thermistor vs. frequent on/off

NTC thermistors has high resistance at normal temperature, thus limiting the effect of a surge of current during power-up. Its resistance lowers after itself heating up during normal operation, ...
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1 vote
103 views

### Identify the temperature sensor on a PCB

I have seven thermostats (for a fan coil central AC system) that unfortunately havd a big problem. When the relays (three big rectangles in black) are closed to turn on the fan they get quite hot. The ...
75 views

### How can I design with the MF52B2 104F3950 thermistor?

I need to design a circuit that maintains a temperature, using this thermistor. Does anyone have general math that works for any thermistor that I can use to create a circuit with it? I would not like ...
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### Thermal design propagation calculations for a DCDC converter

So recently I've been doing some design for a DC/DC (this LMR33630) and now I'm doing the thermal design calculations using as a reference this Appnote, also from TI Accurate Thermal Calculations on ...
174 views

### Why is RTD immune to electro-magnetic fields? [closed]

Thermocouples may have added voltage & induction heating induced in a magnetic field, throwing off the measurements. A Resistance Temperature Detector (RTD) is said to be a good alternative. Why ...
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### Attach thermocouple to a PFC inductor

The inductor I am talking about is simply a toroid. I am attaching a thermocouple junction to this component with help from thermal paste and aluminum tape. Anything I should be careful about in this ...
• 749
1 vote
42 views

### How to distinguish different temperature wire insulations?

Wire insulations have different temperature ratings: 80°C 90°C 105°C 125°C 200°C These ratings can result in different current ratings for the same wire gauge. Are there ways to distinguish ...
• 749
1k views

### 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 ...
• 749
47 views

### 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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232 views

### 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 ...
206 views

### 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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### 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 ...
155 views

### 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 ...
36 views

### 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 ...
1 vote
151 views

### 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 ...
140 views

### 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 ...
62 views

### 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 ...
315 views

### 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 ...
97 views

### 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 ...
1 vote
675 views

### 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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1 vote
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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 &...
223 views

### 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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1 vote
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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-...
108 views

### 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 ...
88 views

### 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 ...
1k views

### 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: ...
713 views

### 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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1k views

### 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 ...
226 views

### 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 ...