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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48 views

Switch on and off a relay based on two different thermistor values

I am planning to add an electric fan to cool down an old car's radiator based on coolant's temperature. I have a temperature sensor of which I know the resistance/temperature profile. Let's say when ...
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54 views

Laser printer heater tricking

I use the toner transfer method to create PCBs. By removing the heat fuser from a laser printer and printing on gloss paper gives me wonderful results. The heat fuser and thermistor sensor is still ...
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I have an MZ4 thermistor, I can't find info about the value of capacitance

I have bought a self assembly kit for power source (based on the LM317). The provided small thermistors are tagged as MZ4. I did my research but couldn't find the datasheet. The PCB is showing them to ...
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21 views

Inrush Surge Limiter [NTC Thermistor] on Primary or Secondary side of Linear Power Supply

In designing a linear power supply, I understand I need to limit the inrush surge current on cold start, to charge up the large bank of filter capacitors, post-rectifier. However, my original intent ...
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46 views

Using a 10K ohm thermistor as a 5K

I have a water cooler that is using a B3950 10K sensor. For energy saving reasons, the microcontroller is limited to 6 degrees celsius (R=24k for the 10k ohm) I can't modify the microcontroller or how ...
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138 views

Why is there a resistor in this circuit?

Why there is a 220 ohm resistor in this circuit? Can't we just connect the thermistor directly to the base of transistor?
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44 views

can two separate circuits use the one sensor

I want to monitor the temperature of my washing machine. I was going to connect a raspberry pi up to the thermistor at the bottom of the drum. Would this interfere with how the washing machine ...
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130 views

Is this the correct way to make a temperature activated fan?

This circuit is being used outside a PC. simulate this circuit – Schematic created using CircuitLab EDIT: @SupaNova The speed will increase with temp and the cutoff temp is 75℉.
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27 views

Need to identify faulty thermistor in order to find a like or better replacement

I have an ic with a poorly performing thermistor I'd like to replace with a more accurate, more sensitive component. The first step is finding out what thermistor I likely have or at least who made it....
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44 views

Calculating NTC temperature on Controllino Maxi Automation yields incorrect temperature

I'm using the analog input on the Controllino Maxi Automation to determine the temperature of a 10K NTC thermistor. At first we thought it was a self heating issue given that with 24V the current ...
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145 views

What does a 'scaling factor' mean for an ADC?

I'm using the analog input on the Controllino Maxi Automation to determine the temperature of a 10K NTC thermistor. I'm having some difficulty understanding how the ADC works. On a regular arduino ...
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37 views

Replacing a NTC in Meanwell Power Supply

I have a query regarding replacing a NTC on a Meanwell dual output power supply. I managed to blow a stepper motor driver and the power supply last night (accidentally swapped a plug to a different ...
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21 views

Sensor QT0805X-102J

I needed to use a sensor to measure variations in temperature from inspired and expired air. But since i am doing a simulation in TINA-TI i am limited in the sensors I can use. I thought of using this ...
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57 views

Respiratory rate monitor

I have this project to build an instrumentation system to measure the respiratory rate. We decided to use a thermistor to measure the variation on the temperature of the air inhaled and exhaled. To ...
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299 views

Output from TD100 with instrumentation amplifier not as expected

I've been having trouble with my TD100 circuit for a few days now and I cannot understand why the output isn't as I expect. This is the process: simulate this circuit – Schematic created using ...
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42 views

Driving 18 Thermistors in parallel

I am designing a circuit that needs to have 18 thermistors to measure the temperature at various points. The thermistors are 2metres+ away from the ADC Usually when I power a thermistors I use a Vref ...
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67 views

Which thermistor or temperature sensors are less power draining?

I am trying to build a low-power system. One of the system parts is a Temperature sensing circuit (0 <T<60 C). Since I am have limited power (~500 uA 3V). I was lost as to which approach is the ...
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57 views

How to operate a lower power thermistor power circuit?

I would like to like to create a temperature circuit that connects to a wireless module (e.g. Bluetooth) to transmit the signal. My challenge is that I have a limited power supply (200 mA - 3.5V) to ...
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32 views

simplifying RTD (resistance temperature detector) units

using a RTD, the norms give you dissipation constants in ohm per ohm per degree C, I dont understand as this should simplify to simply degrees C? what is the meaning of this unit? Thanks!
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82 views

ADC is giving fault codes when I touch thermistor attached to it

I am working on writing a control program for my pellet smoker. I am having an issue with the meat thermometer that came with the smoker. I have a MAXIM 31865 ADC that is connected to a Raspberry Pi. ...
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112 views

Connecting a thermistor to very long cables

I'm working on a design for a multi-sensor temperature alarm for a greenhouse. I plan on using PTC thermistors as the temperature sensors as I have a few 1k PTCs lying around. Can I connect the PTC to ...
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27 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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56 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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1answer
111 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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1answer
113 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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43 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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101 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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26 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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99 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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61 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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114 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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1answer
62 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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1answer
235 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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76 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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43 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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876 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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189 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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40 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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42 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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62 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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46 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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67 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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76 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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63 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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132 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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194 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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222 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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44 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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72 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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50 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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