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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20 views

How to modifiy DC2259A evaluation board to access Vref2 on LTC6811-1 IC? For the purpose of powering external thermistors

I am using a DC2259A Evaluation Board, to monitor battery cell voltages and am hoping to drive external thermistor circuits for the purpose of measuring battery cell temperatures from Vref2 on the ...
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2answers
48 views

Surface mount thermistor practices

I have a 2 layer board that I am mounting directly to an aluminum housing. The circuit contains a temperature regulation circuit to monitor housing temperature by way of an NTC thermistor. As the ...
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31 views

Thermistor in parallel

I want to measure a very low temperature (<-50C) with an NTC thermistor, but the error in my system is dominated by my ADC frontend characteristics due to the high resistance of the thermistor (>...
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109 views

How to calculate measurement error in an exponentially non-linear sensor? (self made pressure sensor)

I'm trying to calculate the measurement error from a home-made pressure sensor which I have in a voltage divider circuit. It has the same negative exponential non-linear resistance characteristics as ...
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41 views

How to determine right size thermistor

I have a blown 15A fuse and a red thermistor about 16 mm in diameter that has blown I can’t get any info on it as I don’t have a part number any suggestions what size the thermistor might be so I can ...
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61 views

how to protect a dc-dc converter (LM2596) and an Arduino from Inrush current

I am fairly inexperienced with electronics so please bear with me. I have an Arduino Nano 33 IoT being powered by a battery pack which at 100% outputs 40.2V and at 0% outputs 36.5V Since the Max Vin ...
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24 views

What factors/parameters shall be considered (or compare with original) while replacing NTC resistor?

Suppose supplier of NTC shut-down the production for the NTC series. In this case if I am unable to find exactly the same component but rather found close match (by comparing B value @ R25/R100), then ...
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81 views

Diode or thermistor identification

Is this a diode or a thermistor? Also, if possible, can you tell the component manufacturer? Thank you.
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42 views

Do I have to deal with inrush current for my AC/DC converter?

I am having a question about inrush current for a simple AC/DC converter. I am using a transformer from 230 to 36 V,followed by a full bridge rectifier and a filter capacitor of 1000 uF 100V. When ...
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2answers
109 views

How do you use an op-amp as a switch?

As part of our lab' design project, we have to calculate suitable resistance values for this circuit below and for others like it with different sensor resistances. However, in lectures we have never ...
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46 views

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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122 views

How do I replace this bike light cache battery?

This Luxos U dynamo powered bike light has a cache battery that provides backup power for the light when the dynamo isn't providing power, and it also provides power to smooth the USB charging that it ...
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73 views

Possible thermistor identification found in thermal conductivity cell

I have a component (I believe it is a thermistor, can you confirm?) de-soldered from a device. Could somebody help me identify the type of thermistor and suggest a method/procedure to identify the ...
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38 views

Thermistor replacement

I need to find a replacement for the defective temperature probe of some device (laboratory incubator), which is basically a NTC thermistor. The only information about the defective unit is the ...
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845 views

Can a 2k thermistor be converted to a 10k output?

I have a 2k ohm sensor that fits properly but I can not find a proper 10k that fits a M14 hole for the water temperature on my car. The gauge I am using only reads the NTC 10k thermistor so I was ...
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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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35 views

NTC Inrush current limiter datasheet

I have been looking at B57238S0100M0** NTC which is rated with R25 = 10R I_max = 5A R_min = 0.16R I already inspected the resistance vs temperature curve and it appears to be straight forward. ...
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41 views

Getting a 100k Thermistor to read properly

I built a 3D printer with a build space of 600mm x 600mm x 900 mm. My heat bed has a 100k Thermistor built into it, initially I could not get it to read properly seeing as how it was only a 2 pin ...
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46 views

Supplying NTC by different voltage from VCC

I would like the sense a material temperature that is located outside of panel. My NTC thermistor is 10meter far from my STM32 MCU based control board. I don't want to use VCC at outside of the panel ...
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44 views

How to diagnose thermistor problem

I have a thermistor which I believe is a NTC 3950, and which I suspect does not work properly. It is from a 3D printer extruder/hot end. The displayed temperatures and the ones I measure using a meat ...
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53 views

PTC thermistor vs. NTC thermistor for measuring the temperature of a liquid

I have to measure the temperature of a liquid. Does a PTC thermistor has any advantage over an NTC one? I mean, are there conditions where one is preferred over the other?
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47 views

Alternative for PTC Thermistor NXP KTY83/122 SOD68 1.02kohm

I am looking for an alternative part to replace an existing thermistor (type: Thermistor NXP KTY83/122 SOD68 1.02kohm). This part appears to be discontinued so that's why i need an alternative. I will ...
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62 views

Thermistor with sharp “cutoff” edge (reaching around 45°C)? [closed]

Is there a thermistor which has a very low resistance up to about 45°C and then, within a few degrees, raises the resistance to a very high resistance? Sort of like a self resetting thermal cutoff ...
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111 views

PCB low power self heating component separation

I am an EE that is fresh out of college and and starting at a smaller company, and I have a question about electronic self heating, and how to keep heat from spreading in a PCB to heat sensitive ...
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166 views

Thermopile temperature sensor

I am using an MRT511 thermopile temperature sensor and COS77DT for amplifying the temperature sensor output. I used Recommended circuit in the MRT511 datasheet but output voltage of the op-amp not ...
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130 views

Using thermistor vs. soft starter for motor

What is the advantage that complex soft starters give over NTC thermistors if one is only trying to get rid of inrush current spikes?
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37 views

How do I accurately measure the B value of an NTC thermistor?

I'm trying to find a part number for an NTC thermistor being used to monitor the temperature of a rechargeable battery. The thermistor I have has no color markings or numbers to indicate any ...
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60 views

Op amp to supply current to 3 thermistors and an ADC voltage reference input

I have 3 thermistors in parallel that I need to measure. These thermistors will be fast changing - think up to 100C in under 1 second. I want to do this ratiometric measurement, so I want to supply ...
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48 views

Analog differential signaling

I'm a software engineer that sometimes has to deal with some electronics. So I'm by no means an expert... I want to control a BLDC motor and I have added a thermistor to the windings of the motor so ...
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504 views

What is the thermistor sensitivity?

Here it is written: Some references use the negative temperature coefficient (NTC) a to describe the sensitivity of a thermistor alpha = -B/T². and here it is The B constant expresses a degree ...
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44 views

Oversampling, additional bits and a thermistor

Say we have a ten bit ADC (MSP430G2433) and a thermistor. We have the problem that two temperature measurements are too far apart, whilst the temperature has barely changed. So, we take more ...
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65 views

Part number Molex 4 pin wire-to-board connector and 2 pin wire-to-board like Corsair CommanderPro

I'm having a really hard time finding the correct PN for a 4 pin header, used with PWM fans. The header I'm looking for is a 4 pin one, similar to the Molex 47053-1000, but a right angle one. I've ...
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118 views

Anemometer with opamp

This is related to an earlier question of mine, but I have a different follow-up question that I wanted to make a new post for. I'm trying to understand more about how the below circuit works, ...
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General LiPo and Li-ion question regarding NTC

Is it only me or are most of the smallish (1500mAh) LiPo rechargeable batteries don't have the NTC pin (only POS and GND)?
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188 views

Finding equation of curve for NTC type thermistor [closed]

I have an NTC thermistor from the KTM 390 engine which I am trying to interface with the Arduino MEGA. The problem is the sensor has no datasheet. I have got the relation between the temperature vs ...
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241 views

Can silicon temperature sensor (e.g. KTY84)'s polarity be inferred if it's inaccesible - polarity band cannot be visually checked?

I have two electric motors at my disposal, both equipped with KTY84-130 silicon temperature sensors (PTC thermistors). The sensors themselves are buried deep within the innards of the motors and I don'...
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Thermistor alternative using variable resister to identify specs and activate 18v Nicd charger?

I have a rebuilt 18V DC Powerhandle (battery)and a new charger. The charger won't activate charging likely because of defective foil wrapped component believed to be a thermistor. Can anyone tell me ...
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38 views

Regulating precision heating

Whats the simplest electr(on)ic(al) method for heating a coil or similar element to a specific temperature? Generating heat is easy; dictating and regulating a specific temperature is the hard part. ...
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92 views

Thermistor with LM358 Dual OpAmp Circuit Validation

Given the circuit layout here with a 9V input and the 10k ohm thermistor specs given, what at what temp would the green LED light and at what temp would the red LED light? I am expecting green to ...
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155 views

Do linear thermistors exist on the market?

I'm working on a project right now that requires me to use a thermistor to sense the tempertaure change with an op amp comparitor with hysteresis. Because of the non-linearity of a normal NTC or PTC ...
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76 views

Unknown component connected to white wire of rechargeable battery

I want to replace a battery for a TDK A26 speaker. (You can see a picture of the battery here). In the country where I live it is no possible to find a replacement, so I decided to replace the ...
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1answer
131 views

How to choose NTC thermistor?

I would like to make a siren on an UPS backup. I used this board with an 18650 embedded battery: https://www.aliexpress.com/item/32911096857.html?spm=a2g0s.9042311.0.0.24db4c4dn31JsH And this siren: ...
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149 views

NTC Thermistor Trigger LED

I'm wondering if anyone would be willing to help me with the basics here. I'd like to create a circuit, as small and simple as possible, with off-the-shelf components, that will allow me to turn on an ...
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5answers
175 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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2answers
46 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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38 views

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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138 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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158 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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54 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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131 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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