Questions tagged [heat]

Thermal energy; where it comes from, and how to keep it from damaging components

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3answers
36 views

Thermal Resistance of PSU's heat sinks

I have a non functional PC power supply unit, and I would like to keep its heat sinks, but they have no model or part number in them. Is there a way to estimate, calculate or measure their thermal ...
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0answers
44 views

How to determine if conductive thread is safe to use? [duplicate]

Passing current through a wire generates heat. Heat can cause things to catch fire. I’m trying to determine how hot my wire can get, and if it is safe to use for my application. I was wondering if ...
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2answers
64 views

What resistor type is best for use as a heater?

I'm working on a design that requires I heat a bank of 18650 batteries during their operation. The plan is to mount the batteries along with large axial 2W resistors in to a PCB and using small ...
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0answers
79 views

Why did the magnets on my phone charger get hot?

I recently bought a fancy car mount for my phone which has the ability to do wireless charging and secure the phone to the mount via a magnet. The magnets provided were described as "neodymium", but I'...
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0answers
46 views

Resistive heating cuircuit design

I am designing a small (10mm^2) resistive-based heater. I wish to heat a ceramic surface to about 250°C, via some high frequency AC-current. My aim to is have some sort of high-temperature PCB printed ...
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4answers
5k views

Why is the metal tab of a BJT power transistor is always connected to its collector pin?

Until now I thought the metal tab of a BJT power transistor is connected to ground but it seems like it is connected to its own collector pin´as shown in the below illustration: Is there a particular ...
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3answers
36 views

Detecting different heat element power

I have a range of heating elements with different power ratings (i.e. different resistances). Is there a way for my microcontroller to detect what power they are so I can use the microcontroller and a ...
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3answers
99 views

Using a small heatsink with a high power LED (50W)

Description I want to use a 50 Watt LED like this one (42mm*40mm) The space to integrate this component is limited. I have only 55mm*55mm*30mm in total. So the LED + Heatsink size must not be higher ...
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2answers
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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1answer
97 views

Whats the simplest heating surface for a DIY project

I'm trying to make a very small (3x3 cm or less) cup or surface that will heat to around 200C. The surface needs to be dry and I only care about heating the surface and not any particular volume of ...
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5answers
2k views

LM7805 heating up

I maked a schematic for trigger a siren 12v by a signal from Raspberry Pi (GPIO18 PWM 3.3V). All the circuit is powered by a power source of 12v 15A (see the image below). SCHEMATIC UPDATED: It's ...
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1answer
120 views

How can a wire have 0 conductivity and 0 resistance?

First post but lurking for over a year I bought some cheap heating pads on EBay a long time ago. 4v wouldn't get all 5 in parallel hot enough and 8v was unbearably hot so they went in the pile of ...
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1answer
56 views

Is heating the nichrome wire with phone battery possible?

I want an nichrome wire to heat instantly red hot when connected with phone battery using 2 copper wires. Do I need any extra circuit to convert the volts into current for heating? (H=I^2Rt) Would ...
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3answers
117 views

Can we generate electricity efficiently from a peltier device by supplying heat?

Is it possible to generate electricity from a Peltier device by only supplying heat (not ice)(something above 343 K )? How efficient can it be? Which is more efficient?- Using Peltier device or ...
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1answer
51 views

Taping down cord with duct tape fire hazard?

Curious as to if taping down a cord is a fire hazard. Some cords have very thick insulation and rubber so I do not see how it would be the case. I will try to find the article and update the post if ...
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0answers
86 views

Heat managment of FR-4 PCB

I have now finished the PCB. I want to run 20 LEDs (105 mA 3.3V) with 105 mA and 6.6V for this I have a 1050 mA constant current source. So I connected 10 LEDs in parallel and 2 in series. Does the ...
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1answer
101 views

Electroconductive fabric

Just by looking at the pictures, can anyone help me identify what kind of blanket the copper strips are glued to? The kind of material and composition. Apparently seems to me to be a very thin glass ...
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1answer
48 views

Battery output power calculated from internal resistance - explanation, relation to heat generation and actual power?

On a battery manufacturer specification (https://www.scib.jp/en/product/cell.htm, "High power 10Ah cell") it says: Output power 1800W* (SOC:50%, 10s, 25°C), *This value is calculated from the internal ...
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2answers
68 views

Arduino incubator

For my project I am building an incubator using Arduino. I use a DS18B20 to read the peltier temperature (TEC1-12706) a DHT22 to read the room temperature and the peltier. I also have 2 fans on both ...
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2answers
62 views

How to have a load pull more current from a low voltage high current battery

I am designing a pair of heated pants and have run into an issue with having to use batteries (or any other portable power source) to power them. What I have now is about 50ft of Teflon wire with 5Ω ...
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1answer
47 views

Power needed to generate for heating strip - Nichrome strip element

I have a nichrome strip, about 8 mm in width - 0.25 mm in thickness - 1 m in length. I tried working around various formulas but can't seem to get a definite answer regarding how much power should i ...
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1answer
108 views

How does length affect current carrying capacity

Will a wire have increased current capacity if the length is sufficiently small? The reason I'm asking is that when doing PCB layout the vias often has thermal relief, which are small traces going ...
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3answers
234 views

Warming PCB in cold environment using SMD components only

I made a sensor board that needs to operate at about -55 degrees Celcius. Unfortunately, its key component often malfunctions when the circuit is cooled for days at the temperature and then powered up....
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2answers
77 views

Controlling heat gun's element: where to put SSR without disturbing motor

I'm working on a pet project of mine, creating a coffee roaster, where I'm using a heat gun as the heat source. To improve my control of the heat output of the gun, I've set up an Arduino to control a ...
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1answer
111 views

LF33CV voltage regulator overheating

I'm trying to turn on a laser (3.3v - 4.5v, 100mw) using a 9v battery and LF33CV as voltage regulator(TO220 package, 3.3v output). After 20 seconds the voltage regulator is getting so much hot. I was ...
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1answer
30 views

What material characteristics are most important for heating element material selection?

I want construct a heating element by screen printing a flat coil pattern of conductive paste onto an insulated substrate. This conductive paste consists of a powder of conductive metal contained in a ...
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1answer
45 views

Regulators lm75xx in series : 12v to 5v [duplicate]

What do you think about puting regulators lm75xx in series in order to get less heat loss as possible : 9v-- to 5v-- to 3.3v , to get 3.3v from 12v supply? The idea is to not using a switching ...
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1answer
57 views

Does melting microwires cause internal shorts

If you overheat a chip, you can melt the microwires attaching the wafer to the package. When this happens, can the melted microwires cause shorts between the pins of the chip, inside the package of ...
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2answers
71 views

Why is voltage specification irrelevant in tripping a PPTC polyswitch?

In a circuit, a resettable fuse (or polyswitch or PPTC) is a kind of breaker component that trips when the AMPERAGE exceeds a given treshold to protect against overcurrent faults. PPTC basically ...
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1answer
80 views

How can this PWM converter circuit be improved?

This circuit is intended to use a 1-10Hz PWM signal as input and produce a 1-10kHz 10A PWM output. It will be used for controlling the speed of a water pump: GP1352 The PCB will be ordered with (only) ...
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0answers
89 views

Why are there no nichrome resistor pastes?

Nichrome wire is commonly used for wire coil heating elements. Other heating elements are formed by screen printing a pattern of "resistor paste" onto a dielectric coated substrate. These pastes are ...
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1answer
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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1answer
79 views

How to power a nickel chromium wire to produce heat without burning the power adpapter

I want to build a toaster just for fun. I want to buy a nickel chromium wire to heat the toaster's plate. How to avoid burning my power adapter cuz the resistance is too low. I currently have a ...
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1answer
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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2answers
89 views

PSU drops both current and voltage when connecting to an LED

I'm connecting a DC PSU to a high power LED. I'm setting the maximal current, and a voltage. For the first few seconds, I'm in the c.c mode (voltage drops from its initial value to a lower one). But ...
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1answer
106 views

TPA3118: coils and op-amp getting warm

I designed a simple board based upon the ds of the TPA3118. Here the actual schematic: When I power the device, even with no input signals, coils (L1..L4) and op-amps (IC1..IC2) reach a quite warm ...
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1answer
73 views

Calculating heat generated by resistance wire on 3 phase current

I am designing a heating element consisting of resistance wires coiled around a tube to heat water flowing in the tube. All three heating elements (loads) will have the same resistance and will be ...
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2answers
116 views

What to do when there is no ground cable?

I'm trying to connect a heating cable (heating tape) which is constant wattage type. This cable requires 240V. However, I realized there is no ground cable as you can see in the picture below. it only ...
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6answers
2k views

Heat output from a 200W electric radiator?

Im looking at installing an electric towel radiator. The heating element is 200W. Dose that mean that it would both : use 200W of electricity provide 200W of heat output to the room ?
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3answers
63 views

How to prevent voltage regulator board heating up and how thick traces should be?

Im designing a DC-DC voltage step down regulator based off of a switching regulator IC from texas instruments. I have designed the schematic and board accordingly and it should be able to supply 5A at ...
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1answer
33 views

Calculating electromagnet – magnetism vs heat

Im making an electromagnet that will be more or less permanently turned on so I need to avoid heating problems. I have studied this a bit and came to the conclusion that: the lower the gauge (AWG) (...
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2answers
74 views

Can a trim-pot wiper or contact point gets oxidized over time?

Can a trim-pot wiper or contact point gets oxidized over time? For example when a potential (high) current is flowing and the contact point of the wiper on the resistive element heats up a little. I ...
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2answers
83 views

How to heat an e-cigaret coil

I am working on making my own "mod" for an e-cigaret (A mod is the device that controls when and how much the coil is heated up to) I have read a lot about it during the last couple of days, so i ...
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1answer
89 views

Calculating MOSFET Heat Dissipation onto PCB

So for my Heated-Glove project, I was thinking of making a series-parallel battery circuit that is powered by the ATMega328p Microcontroller. What this circuit does is charges the batteries using two ...
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2answers
112 views

DC motor in vacuum, heat generation

I am designing a motor system that has to run in a vacuum chamber (sub mbar). I am a little bit worried about the heat that would not dissipate at all in the vacuum. Therefore, I want the least amount ...
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0answers
77 views

How to calculate MOSFET temperature increase in PCB

I want to calculate MOSFET(DATASHEET) temperature increase for PCB. MOSFET - FDD86250_F085-D Totally 13 MOSFET's will be mounted in PCB. At the same time, maximum 8 MOSFET's will be used in PCB 1, ...
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1answer
51 views

Connecting K-Type Thermocouple wires to a data logger with a male and female plug

I'm trying to setup a temperature data logger using Graphtec GL240. I will be using K-type thermocouples for the logger. I want to run short length of k type cables from the logger to a female K type ...
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4answers
5k views

Is DC heating faster than AC heating?

If I have a 120V @ 50Hz AC heater rated at 750W, and I run it using 120V DC, will the DC heat it faster, and why? (Assuming I could get a clean 120V DC power source).
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1answer
111 views

Will WS2812B overheat because of epoxy?

So I'm currently working on a standing LED lamp with WS2812B LEDs. The length will be about 1.2m with 60 LED/m. I'm planning to cover the LEDs with white epoxy to diffuse the light and have a nice ...
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1answer
110 views

Should a UPS transformer heat up on no load? [closed]

I have a ups, APC-1100BX whose transformer heats up so much that the top of the body of the UPS gets heated up too. It gets hot to the touch when there is no load. The UPS is ventilated and when the ...

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