Questions tagged [thermistor]

A device that is used to detect temperature - the word is a portmanteau of thermometer and resistor. The detection mechanism is the measurement of resistance which changes predictably with temperature.

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21 views

Reading thermistor resistance values from EVAL-ADICUP 360

The EVAL-ADICUP360 is an evaluation board of the ADuCM360 microprocessor. I am trying to read the resistance of an NTC thermistor via the internal deferential ADC. The internal ADC has a limit of 1.2V,...
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138 views

Which is faster for an MCU? Calculating Steinhart-Hart or search in Look-up Table?

Let say we are to measure 0-100 degree Celsius in 0.1 degree resolution by using an NTC. For a particular MCU which is faster (takes less time to reach the result) : a) Reading NTC value via ADC and ...
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41 views

How to get NTC resistor's temperature vs resistor curve?

I have a thermistor MF52203 whose rated resistance is 20k. However, the datasheet seems like not providing the temperature vs resistor curve. Without this curve, how can I get the corresponding ...
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ntc half stack V (oltage?)

could somebody assist pls? im experimenting with battery pack for my cordless chainsaw blackanddecker 36v gkc3630l20 h1 36v. i created 36v battery pack from lifepo4 batteries instead of liion. it ...
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131 views

Need help with circuit design

For the class I am taking, we are to design a circuit with a thermistor in a wheatstone bridge. When the thermistor senses a temperature above 100°F or below 60°F it is supposed to turn on a ...
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35 views

Different markings, same thermistors?

I have three thermistors marked as follows: SCK 053 (dark green); NTC 5D-9 (black); DSC 5D-9...
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102 views

Applying heat to a transistor

I witnessed an experiment in which a transistor was connected to an led and a power supply. A lighter was used to heat up the transistor and this reduced the resistance of the circuit and made the ...
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48 views

Same thermistor model (103) with varying response

I was using thermistor model 103 to measure temperature of surroundings. To my surprise, when I checked different thermistors of the same model (103) bought from the same shop by changing them in the ...
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67 views

How many inrush current limiting thermistor do I need and where should I place them?

In most designs they place a single NTC thermistor in series before the bridge rectifier and in some two or four: simulate this circuit – Schematic created using CircuitLab Isn't a single ...
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103 views

What is a good (cheap) way to slow down a fan with a thermistor?

What is a good (cheap) practice to manage a fan with a thermistor? Here is what I think to do: simulate this circuit – Schematic created using CircuitLab This should work as temperature ...
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ADC reference voltage for nRF52840

I have designed an voltage divider bias with thermistor and the output voltage is given to adc pin of my nRF. But the internal reference voltage of my nRF is 3.6V so I did not get any accurate values ...
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55 views

ESP8266 (Wemos D1 mini) analog thermistor

I'm trying to connect my floor heating thermistor (NTC) to ESP8266 (at Wemos D1 mini board). But I'm unable to get good results. I get an approximation formula from this table (after I input my ...
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Thermistor - NTC 10 D-9 , steinhart-hart equation

I have the steinhart equation which is 1/T = A + Bln(R) + C(ln(R))^3 Where can I find an exact datasheet for NTC 10 D-9 ,(Please attach the exact datasheet with its temperature and resistance table ...
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105 views

Thermistor scavenge from digital medical thermometer

To be more specific, there's this thermistor I scavenge from an old medical thermometer. Something like this Cut to the chase, I connected my multimeter to the two wire of the thermistor where my ...
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89 views

How to calculate the value of the thermistor based on the output voltage of this circuit

I recently bought a board that consists of this circuitry. It came without an instruction whatsoever, so I have to figure out how to measure the temperature based on the output voltage at the To. The ...
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OTI-301 Infrared Sensor

I built an infrared thermometer using the MLX90614 IR sensor and an Arduino Nano. I needed a little higher temperature reading so I changed to the OTI-301 sensor hoping that it would work with the ...
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53 views

Determine possible thermistor value in multimeter

I have a Toptronic T835 multimeter that has a cracked component that looks like a thermistor. It is marked TR1 on the PCB. The only text on the component is first row [obscured character]B and second ...
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731 views

Hot Glue Gun NTC Heating Element?

I decided to take apart a cheap hot glue gun to see how easy it would be to replace the heating element to power it from battery instead of mains. I found the crystal heating element sandwiched ...
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122 views

Fake thermostat with resistor

I have a thermostat (think pt100) This should be connected to a heating solution. I want to fake the temperature from thermostat, so I was thinking to buy a resistor with the ohms at the temperature ...
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326 views

Why is my 10k NTC thermistor on average accurate to 2C

I am trying to figure out what is causing the 2C inaccuracy in my thermistor calibrations, my goal is to get my accuracy down to > .1C. I am using the KS103J2 10K NTC thermistor. To calibrate my ...
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129 views

Why do all my NTC thermistor have a PTC curve?

Suddenly, after testing my NTC thermistor (100k), the thermistor's curve started to turn into a PTC curve. To measure the resistance I am using an Arduino. I think its a hardware issue as I did not ...
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125 views

Does increasing the current make a thermistor more accurate?

For example, if the resistance/temperature ranges were fixed to 7500ohms (0C) and 400ohms (70C). At 30mA, the voltage would be 225V (7500ohm), and 12V at (400ohms). If the current was to 50mA, it ...
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445 views

Please help me to read schematic [closed]

I am doing repairs on a monitor of mine and I have to replace a thermistor. I cannot quite read the values of the thermistor on the schematic for the monitor. Can someone see the image and help me to ...
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119 views

Difference between standard and extended Steinhart-Hart equation

I looked up the data table for a thermistor I purchased and noticed it uses an 'extended' Steinhart-Hart equation. I'd like to understand the difference between these equations, such as how the D ...
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44 views

Battery heating issue

In my project, we are using Li-Polymer batteries. We have LCD and high-power components which will generate heat. We have an enclosure in which battery and LCD and other hardware will be fitted. We ...
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111 views

How did static charge ruin my control board?

We have a Thermia geothermal heat pump that was working fine up until we had a particularly bad thunderstorm. Lightning took out the power for a while and burned up a DSL modem, a router, and a IP ...
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56 views

Help to identify an uncommon thermistor

I am trying to identify a thermistor that was used in a "smart thermostat". It is a surface mounted small part (0603 form factor), bears no markings. I measured the resistance across at a few ...
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67 views

Thermistor probes wired in parallel

I have three temperature probes. Each probe consists of four sensors (NTC) with a common wire. The sensors wires are connected together and the common wire for each probe is available: The wiring ...
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4answers
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What's the simplest way to calibrate a thermistor?

As a hobbyist who don't have access to lab equipment, it really seems impossible to me to be able to calibrate the thermistor that i have. Of course there are calibrated temperature sensors like ...
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96 views

Beta value of the thermistor

Why is that there are two different Beta constants for a same thermistor even though Beta constant depends on the material? For example: Murata's NCU15XH103D60RC has three different beta constants: ...
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68 views

Cryogenic PCB temperature monitoring

I'm operating a board at cryogenic temperatures (65 degrees Kelvin and higher) and need to monitor the PCB temperature. All of the standard surface-mount thermistors I've seen have operating ranges ...
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47 views

Thermistor in power supplies

a thermistor is commonly used in power supplies to limit inrush current. But once the thermistor is heated up the resistance is ideally 0ohms. If i switch the power supply on and off rapidly there ...
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119 views

Analog input like in a PLC: Thermistor or 0-10V

Depending on the configuration, PLCs can often measure 0-10V, resistance or 0-20mA on the same set of screws. How to use the same screw terminal to measure resistance of an NTC element, voltages in ...
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67 views

need help identifing parts

The first Green bit is a thermistor out of a fluke 374 clamp meter, but cant find the manufacture from the logo or what the number means. The other is a socket pin from a single wire connector, its ...
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Trying to get (more) accurate readings from thermistor (electronics, math, and code inside)

So I'm trying to get accurate temperature readings off this TDK B57164K472J thermistor... It's connected in series with a 1 K resistor, and connected to an ESP8266's onboard ADC. The thermistor has ...
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177 views

Where better to pull the NTC thermistor? To earth or VCC?

I have a NTC thermistor, resistance 10k. In various examples, thermistors pull either to the ground or to the VCC. The question is, is there a difference and what is safer?
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62 views

Is there a difference between a tempco resistor and a thermistor?

That is, other than just the nomenclature.
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147 views

NTC Project (Wheatstone Bridge + Instrumentation Amplifier) - Stuck!

I've been lurking through these forums for years but just now had the urge to ask for help. I'm creating a thermometer (using an NTC thermistor) for my college project. I began to analyze my sensor ...
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44 views

Can a Current Limiter Power Thermistor be used in line to reduce the brightness of a 120v incandescent bulb?

I have an application were I do not have the room for a dimmer switch but need to reduce the lumens of a 120v 25w incandescent bulb just a bit. There used to be a product called the Bulb Saver Button ...
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261 views

How to calculate resistance to use along with NTC 103 thermistor to measure temperatures between 0-100 degrees celcius

I am a complete noob to temperature measurement. I initially tried to measure temperature using LM35 but i got negative values at room temperature and the values were fluctuating a lot. I want to try ...
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70 views

Motor/MOSFET Does NOT React To Input On Breadboard

So I have tried so many different variations on breadboard of this circuit but the motor seems to just be powered by the power rail on breadboard. It does not react to any change in the input and ...
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75 views

How do I identify and work with this thermistor

I've got a PTC thermistor, as pictured. It's being used to detect the output temperature in an in room eletrothermal storage (ETS) unit from Steffes. One of them fell out. It's like some kind of ...
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174 views

Power Supply Design Help- failure at higher currents

I am trying to design a 60V 6A supply to power a power amplifier. Here is the circuit I have so far. Feel free to open it in Circuit Lab and play around: simulate this circuit – Schematic ...
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253 views

Strange NTC behaviour: it goes open circuit when cooling down

My partner has a heater for heating wax that is used for waxing legs and other body parts. She told me it stopped working; it does not heat up anymore. When I opened the device and looked at it I ...
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178 views

How do I determine whether a sensor is a thermocouple or a thermistor?

Is there any nondestructive way to determine wether a soldering iron uses a thermocouple or a thermistor? The documentation on the iron claims it is a PTC ceramic heater. Some manufacturers mention ...
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129 views

Can you explain the 3 terminals that PTC thermistors have

Okay, so I found from Amazon a cheap PTC thermistor with a fan, just search "Zerodis PTC" and you find it from there. I see it has 3 terminals, also other PTC elements do. Since it's a semiconductor ...
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83 views

How to reduce inrush current for DC Motor in boom barrier gate application?

I'm using 24V 25W 100RPM DC geared motor for boom barrier gate application.So I added an overload protection for that circuit but whenever the motor starts the inrush current is produced and it ...
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137 views

Can resistors be used to bring a heating element within range?

I have a replacement 24V/60W desoldering gun I would like to modify for use on my Aoyue Int958A+ soldering station. My 968A+ has a smoke absorber which has enough suction to double as a solder vacuum. ...
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59 views

Which temperature transducer has these characteristics?

The resistance temperature characteristics of a temperature transducer is show in the figure below, The transducer in question is which of the following? A) Nickel RTD B) NTC thermistor C) Platinum ...
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334 views

ptc thermistor simulation in proteus

I want to simulate ptc thermistor in proteus.But I need this informations. 1) Thermal Contact Res. (°C/W) 2)Thermal Res. to Ambient (°C/W) 3)Time constant (s) datasheet information of ptc ...

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