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

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18 views

Cermet potentiometer temperature coefficients

I'm engineering a system that is temperature-sensitive, between ~-10-30C. I've moved to using cermet potentiometers because of their sub-200PPM/C temperature coefficients. If I wire such a pot with ...
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4answers
241 views

Why does temperature modify the characteristics of a diode?

Everyone knows that temperature affects every semiconductor device you can think of, and diodes are no exception. From the below graph, we can see that the temperature has marked effects on pn ...
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1answer
25 views

semiconductor resistor vs resistor in SPICE modeling Altium

I'm doing some SPICE modeling using altium and would like to apply the temperature coefficients of the passive components for a more accurate simulation. However, as far as I know, in altium the ...
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1answer
36 views

Will a 3-32 VDC input signal relay be damaged (or will work) with a 110 VAC input?

I'm looking at getting a SSR-25DA relay (http://www.amazon.com/gp/product/B0087ZTN08/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A1THAZDOWP300U) and using it with a temperature controller that ...
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1answer
28 views

Expected repeatability of PT100 temperature sensor

I'm designing a circuit to measure temperature using a PT100 sensor. I'm putting 1mA through the sensor, and measuring the voltage drop. Assuming a perfect voltage measurement, what would be the ...
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1answer
26 views

IC Thermal shutdown recovery time

Many RS485 transceiver chips have a thermal shutdown when the junction exceeds 150C. Typically they switch back on once the junction temperature drops 15 degrees. How long does that typically take? ...
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0answers
32 views

How to make a Lithium-Ion battery sub-zero proof

I'm planning to use 2 Lithium-Ion batteries in parallel to power my arduino via a step up converter. The batteries get charged using 5W a solar panel during the day. The problem iy, temperatures can ...
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0answers
39 views

Temperature Sensor for Battery Cell

In a battery monitoring project, battery cell's efficiency is to be calculated with a very high accuracy . Also the temperature is to be measured (not necessarily with a high accuracy) for emergency ...
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1answer
58 views

temperature loss in a metal surface

A metal cone is heated at certain temperature . say 45 -50 deg C. i placed a thermocouple(k type) over the surface of the metal to measure the heat transferred over the metal surface. The ...
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0answers
34 views

Sensor in terrarium

I am equipping my terrarium with temperature and humidity sensors and wanted to know how to correctly install them. The surface within my terrarium is covered with a layer of epoxy resin and if ...
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2answers
46 views

Setting Kanthal Wire [closed]

I have a furnace that is heated by a small Kanthal coil. The core is formed by wrapping the Kanthal wire around an alumina cylinder. One problem we have had is that the wire springs out of shape after ...
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1answer
60 views

resistor drift via temp messing with ADC readings in voltage divider

I am voltage dividing 0 to 64 VDC down to 0 to 1.8 volts via a simple voltage divider. I am using 1% resistors. The problem is that the readings from the ADC in my beaglebone black seems to be ...
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5answers
74 views

Welding Thermocouple to Test Sample

I have a 3mm copper test sample that is going to get heated up, and I would like to know how hot it is actually getting. Previously, we have just held the thermocouple close to the sample, but we are ...
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2answers
508 views

Is it proper to use an internal layer as a heat bed if I want to warm my multilayer PCB?

I need to design a circuit to warm my PCB. There are many ways to build up such circuit. But I learned from a post "Warming PCB in a low temperature environment" that maybe I can use traces as heater. ...
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1answer
80 views

How to design circuits to work under -55 Celsius degree?

Possible related post:Warming PCB in a low temperature environment I am trying to design a circuit which should work properly under -55 degree. There are two options in front of me: to choose ...
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2answers
62 views

Maximum separable distance between Micro-controller and LM35 (temperature sensor)

I am using LM35 temperature sensor to sense temperature of surrounding. I have connected LM35 to Micro-controller through a jumper of about 20 cm. It is working fine. Now I want to increase distance ...
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3answers
65 views

How use DMM thermocouple probe hands-free to monitor heatsink temperature?

I suppose this is more of a lab practice question than electronics per se, but I wonder if there's a standard-ish way to mount the K-type thermocouple that comes with my Fluke DMM so I can monitor the ...
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3answers
888 views

What kind of material of PCB should I choose to work at -40 degree centigrade?

I need to design a PCB circuit to work at (or even below) -40 degree centigrade. Normally, I use FR-4 PCB board at room temperature. However, I have learned from the question "What is the minimum ...
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1answer
38 views

Will this temperature compensation work?

I have a circuit and as a part of it I need to measure the battery voltage under a load. Naturally I would need this load to be constant each time I measured it to accurately know the battery levels ...
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2answers
88 views

Good Batteries for (way) Sub-Zero Temperatures

I am building a PongSat and I need some batteries that can withstand the temperatures found at very high altitudes. The pongsat is planned to go up to around 100 km altitudes where the temperature is ...
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1answer
73 views

Connector type for precision PT100?

Any advice on how to choose connectors for a 4 wire PT100 (plus shield)? Bearing in mind this is a precision measurement using 1/10 DIN RTD standard, and I'm concerned about thermocouple effects, etc. ...
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1answer
47 views

What is under the hood and how different temperature sensors work? [closed]

There are a lot of different types of temperature sensors for various applications. I am mostly interested in human body temperature measurement. After some reading I'vee been able to distinguish ...
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1answer
50 views

Controlling an electric water heater

I'm trying to control the temperature of water heated electrically. On devices sold commercially I see that temperature is not being controlled, and the heating elements are either turned on or off ...
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4answers
180 views

Heating a 1km long wire to 110 C using a 12v supply from a car cigarette lighter

I am a complete newbie to anything electrical/electronics. I am doing a project where I need to heat a 1 km long (Nichrome/Kanthal) wire to up to 110 degree Celcius. The only power supply available is ...
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0answers
115 views

DHT22 temperature & humidity sensor react slowly to the environment change

I am right now connecting the DHT22 temperature and humidity sensor to the Arduino. It works well to print the temperature and humidity value every three seconds. However, I made a experiment to put ...
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2answers
56 views

recommended wattage for soldering station

I'm looking at buying a new soldering station and trying to figure out what would be the right wattage. I'm going to soldering everything from electronic components (not much SMD, if any) to 16mm2+ ...
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0answers
34 views

MEMS Gyro temperature compensation

For a project that requires the use of a MEMS gyro sensor to maintain a fixed heading, I am trying to implement the ST L3GD20 MEMS chip. Very briefly, it has two internal low pass filters and a high ...
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1answer
38 views

Looking for a high temperature potentiometer [closed]

Does anyone know of any potentiometers that are rated up to 500 degrees F?
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1answer
58 views

Powering ATtiny85 for temperature sensing

I have been working on a miniature temperature sensing module which buzzes once the temperature crosses a threshold using ATtiny85, lm35 and a pico buzzer. When I power the whole circuit using an ...
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4answers
123 views

Is there a Formula to Predict Delta Temperature based on previous trend?

I need a way to predict delta temperature curve based on previous trend. I do a lot of heat rise testing on electrical conductors and I would like to be able to atleast get an approximation of the ...
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2answers
89 views

How do you measure the actual package temperature of PCB components?

We have an IR thermometer at work, but sometimes I feel like the results aren't completely accurate due to the beam width (especially on small components) or material emissivity. Another way I've ...
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1answer
104 views

Regulator circuit design

I need to design a regulator for my thesis, but I really need help, Please! The topic: - A temperature regulator for a small fridge Some details: - the regulator has to control a peltier element ...
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1answer
44 views

What is the critical temperature when (batch) desoldering?

I have seen videos on youtube with some guys using hot air pistols (or even small propane burner with bunsen flame) to desolder the components from a PCB. The job is done REALLY quick! The components ...
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1answer
64 views

How hot do High Power 1-3W LEDs get

I'm thinking of Using 3W RGB high power LEDs for a project. I will only have one color on at a time so I'm pretty sure that it would be 1W of ussage at a time. (please correct me if I'm wrong) My ...
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2answers
106 views

Alternative ways to maintain temperature stability of silicon BJT circuits other than feedback resistors

So I've been messing with Bipolar Junction transistors lately and I'm trying to really nail the concepts of designing circuits with these things cause I want to start using them in some of my circuits ...
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1answer
73 views

Ambient temperature vs operating temperature?

I would like to know the difference between Ambient temperature vs operating temperature? In datasheets they specify operating temperature for IC's. ex -25°C to +125°C, so does this mean even though ...
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0answers
30 views

What sort of sensors are used in Luna, smartbed device?

Luna is basically a sheet that is placed on your bed and measures temperature, then adjusts it for you with the optimal condition. I was wondering what kind of temperature sensor they use for reading ...
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1answer
93 views

Pros / Cons of LM35 and Thermistor, what alternatives?

I'm wondering which benefits/downsides I have using following thermometer? Is there something I'm overseeing? For easy temperature measuring, what would be the easiest? My Opinion is LM35, am I right? ...
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4answers
225 views

How to best connect a temperature sensor to an aluminum block?

2 questions: How would you connect a temperature sensor to an aluminum block? Could I use a thermal adhesive, basically just gluing the sensor to the block? Which sensor would you buy? I like the ...
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5answers
669 views

Where is the cold junction on the commercial thermocouples?

According to all textbooks and articles, a thermocouple must have a cold junction somewhere on the middle of it. But none of the commercial products have a middle point or a marked spot for ...
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1answer
88 views

How to control the temperature of heating element

I am developing a heating application where temperature need to be constant. I am planning to set the temperature @ 200 degree C. when my sensor find the temperature exceeding the set temperature how ...
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2answers
94 views

Heating a li-ion battery for use in sub-zero temperatures

I have a design that I'm working on that is to be outdoors year round, with a 1 watt solar panel trickle charging a 6 Ah li-ion battery during the day. I expect there to be about 3 to 4 months of ...
2
votes
1answer
83 views

Implementing an Avalanche Photo Diode Circuit

I am working on a circuit that will make low light measurements in the visible range. The measurements will be of biological samples that are fluorescing. For this application an Avalanche Photo Diode ...
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0answers
76 views

How does temperature affect the performance of an SMPS?

I have an SMPS (laptop AC adapter) rated for 180 W that is presently operating at capacity. The output seems to be limited by internal resistance, but I can't really tell. I'm trying to get it ...
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1answer
31 views

High Energy Metal Halide Bulb Heat?

I am building a custom box from wood (around 14 inches by 10 inches by 10 inches) to encase 3 high energy Metal Halide Bulbs (400+ watt each). The box will be opened and closed intermittently, ...
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1answer
74 views

DH-11 Sensor on a Raspberry Pi & Arduino

I am trying to make my DH-11 sensor work on my raspberry pi but I have not succeeded after several attempts. I followed the following tutorial from Adafruit: ...
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2answers
104 views

How can I make the dimensioning of a temperature monitoring circuit?

I need to design a circuit to measure temperatures in the range 15-40 degrees C (this will later be the basis for a regulator of a peltier-element for a fridge). I tried a circuit using the ...
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0answers
30 views

Using the thermal expansion as the driving mechanism for an analog switch

I'm not sure if this is the right place for this question or if physics might be better suited... I've been trying to solve for an analog switch engaging when an element reaches a temperature of ...
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3answers
82 views

Could I use a surface mount thermistor to measure ambient temperature?

I'm working on a project where a device I'm using has this thermistor, a Murata NCP15WF104F03RC, to measure the temperature of the device itself. This is a surface mount thermistor. The implementation ...
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0answers
48 views

Does a Temperature + PPG integrated sensor exist?

I am trying to measure body's temperature and pulse from the ear (fitting sensors inside of earbuds). Does some kind of temp + PPG sensor exist? It would be great to reduce needed space. I could then ...