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

learn more… | top users | synonyms (1)

3
votes
6answers
832 views

Why is electric heating so expensive? [closed]

The loss of electricity in transmission and distribution is only 6%, so why is it that electric heating is so inefficient? I would imagine that the generators at power plants are far more efficient ...
0
votes
1answer
65 views

Could I create Peltier cooling module from iron and copper?

I want to create a tiny, easy to maintain one-purpose distilation unit. It's supposed to distilate expensive tetrachlorethylene to clean it from whatever is dissolved in it. There are millions of ...
0
votes
4answers
62 views

Controlling a 1000W radiant heating element with dimmers

First I would like to mention that I am a stranger to electrical components and I come from a mechanical engineering background so please keep that in mind when answering my question. I am trying to ...
0
votes
1answer
70 views

Creating Heat with Resistors

I am trying to create a cheap and small heating element capable of reaching temperatures of at least 260 degrees C. I am considering using a resistor. Is there such thing as a cheap resistor capable ...
4
votes
2answers
55 views

MOSFET package with lower thermal resistance than D2PAK

As far as PCB surface mount MOSFET packages go, does D2PAK generally have the lowest thermal (junction to ambient) resistance? Are there other packages with lower \$R_{jc}\$? This question is based ...
0
votes
0answers
51 views

Inducing Eddy current in wet clothes

Is it possible to induce eddy current in wet clothes and dry them using the resistance heat generated? I don't want to connect any wires to the clothes.
1
vote
1answer
41 views

Thermoelectric couple heating on both sides [duplicate]

In college my physics professor showed us a thermoelectric couple powering a fan. He also explained how if you apply a current it cools one side and heats the other side. I have been working on a ...
0
votes
0answers
54 views

Simplest way to detect body heat

I need to detect how hot/cold a person is with a sensor (or multiple sensors) in close contact. I've looked at temperature sensors such as 18B20 and TMP36 but I'm not sure how to detect if a person ...
0
votes
1answer
99 views

Flyback NE555N driver and mosfet overheat

I have built a small and very simple flyback SMPS based on NE555N IC. The circuit exactly I did built from is shown below: It works nicely for small loads. However I have some issues with it: ...
2
votes
1answer
105 views

Something better than an H-bridge to drive motor?

Is there something better than an H-bridge to drive two motors using the ATmega8 with a 7V power supply? My teacher said the H-bridge overheats and is bad. Is there a better solution? For instance: ...
2
votes
2answers
97 views

Can Lithium Ion Batteries be used to generate heat for a RC Hot Air Balloon? Any particular heat-generating device?

First the background: OK - this is a personal project that I've always been interested in trying but never got around to it - a remote controlled hot air balloon. Sadly I am not technically-inclined ...
1
vote
1answer
72 views

L293D overheating

I have an old RC car. I removed all electronic from it, just left the plastic and the DC motors. It has 2 DC motors(1 for moving, 1 for left/right). I decided to attach arduino to it, while ...
1
vote
3answers
186 views

IC - Case temperature vs Operating tempaerture

When datasheets lists(MAX9744) that the normal operating temp are b/w -40 c to 85 c but the case temp should not be up above 165 c what are they suggesting. How come an IC work if its case temp gets ...
1
vote
1answer
53 views

Difference between infrared heating tube coatings?

I'm converting a toaster oven to a SMD reflow oven and have found the thermal momentum of the resistive elements to be a problem (standard dark-grey type). So I've been searching online for some ...
0
votes
0answers
26 views

Average heat generated on thin circular plate in harmonic magnetic field

I have problem with this equation, I have final equation, but I don't know steps, how you get this equation. There are the eddy currents in thin circular copper plate thickness h and radius a, in a ...
1
vote
1answer
230 views

Why is my N-channel MOSFET getting very hot and the power it provides to device increases with temperature?

I have a fairly simple situation: N-Channel MOSFET with base connected to Raspberry Pi's 3.3V source connected to ground and Drain connected this way: +12V ----> Vacuum Cleaner (60W) -----> Drain. Guy ...
5
votes
2answers
422 views

How do I tell what gauge wire I need?

I've been working on providing power for high current applications for my project. I'm working on a project with high current (or at least compared to what I'm used to...) What a lot of people point ...
1
vote
6answers
168 views

Why is pin protection needed?

I have read this article about protecting input pins. One thing is still unclear to me — why is the protection needed at all with such a high resistance on the input pin inside of the ...
-1
votes
2answers
81 views

Fast thermal ramp up/ power efficiency [closed]

I want to build a controlled temperature well in an alumminum block, and right now I am in doub as to what heating method choose. I am mostly torn between a high power resistor such as this or ...
0
votes
1answer
43 views

Is there risks or limitations to install driver board under a pinball playfield?

I'm currently designing the electronic for a pinball. I would like to reduce the usual cable mess under the playfield. I'm thinking of creating small driver card that handle small amounts of switch, ...
0
votes
2answers
152 views

Arduino overheating with 5V addressable LED strip

I've got one of those 1-meter addressable RGB LED strips from Sparkfun (link) connected to an Arduino. The Arduino is powered by the recommended 9V DC 650mA power supply through the barrel jack. ...
1
vote
1answer
189 views

Designing a copper plate heat sink

I’m trying to see if a copper sheet I have with me (25 cm X 30 cm, 0.05 cm thick. There's a 6 cm X 6 cm square hole in the center to place a lamp.) is sufficient to keep 36 luxeon rebel LEDs (mounted ...
0
votes
4answers
126 views

sn75441 output supply current - heating

I am experiencing excessive heating problem with SN75441one. I know that I can use heat sink but I want to be sure that I am not doing sth wrong. I am using SN75441one to drive a bipolar stepper ...
3
votes
1answer
164 views

LM324 comparator IC getting burnt

I am using LM324N as a comparator which has Reference voltage of 1.2V to +ve terminal. It requires supply voltage VCC=24V & VEE=Gnd.When input is 0V Vout=24 and when input= above reference voltage ...
1
vote
1answer
57 views

Which AWG for an RGB LED Stripe?

I've bought a RGBLED stripe with 300 SMD5050 RGBLEDs. These are rated at ~18mA on 5V each, so I have approximately 5.4A on the complete strip. I have to cut down the strip into several parts and have ...
2
votes
1answer
80 views

Heating and Chilling ICs instantly from 200C to 0C? Does it damage the silicon inside?

I soldered VCXO oscillator and suddenly tried to cool it down with a cooler spray. Do you think that sudden cooling and heating damages the chip. The heating and cooling were well within the spec ...
1
vote
1answer
163 views

How to create this copper coil to withstand much heat

Hopefully this is not as off topic as it might seem. Some background information: I've created the coil below to use as an induction heater from regular 230Vac household insulated wire. The coil is ...
-2
votes
2answers
124 views

Thermostat bypass wiring [closed]

I'm trying to bypass the heaters thermostat of my apartment and having only a small knowledge of electronics I would like to have a some help with it. Forgive me for the ugly paint schema but I ...
1
vote
2answers
158 views

Running a 230V heating element using 120V [closed]

Would a heating element that is rated at 3000W at 230V actually heat properly if the element was powered by 120V only? My hope is that it will just take longer to hear up, but worry is it can't get ...
0
votes
2answers
58 views

Power dissipation on chip vs. Over power dissipation

I was reading this pdf regarding computation from MIT's opencourseware and on p.8 through some obscure mathematical manipulation they basically reach the conclusion that the cooler you make your ...
9
votes
4answers
439 views

What exactly gets “worn out” and damaged by heat?

It's quite common knowledge that heat is bad for electronics. That constantly high temperature decreases the expected lifetime of computer parts even if they are not overheating per se. If, for ...
2
votes
2answers
640 views

Can I use lower gauge wire for short runs of longer high amp circuits?

This question is probably more of a "please explain whatever concept I'm missing." But I'll start with my specific question. I'm building an electric brewery and am using a 5500W 240V (23A) heating ...
3
votes
1answer
365 views

Design of a nichrome heating element - achieving predetermined power dissipation

I want to make a nichrome heating element with 1500 watts of heat being produced while running on 120v AC. This will be part of a air heater as a fan drives air over a circular coil of nichrome wire. ...
1
vote
1answer
148 views

joule heating - transmitting power at higher voltages reduces resistive loss?

electrical engineering hopeful here. Can someone explain with math how transmitting power at higher voltages reduces resistive loss? I know Joule's Law Power is proportional to (I^2)*R lets say ...
6
votes
2answers
235 views

Pick a heatsink for voltage regulator

I have to dissipate \$2W\$ from a voltage regulator. It's a 7805 in a TO-220 package. The datasheet is here. It's the first time I have to pick those so I would like to have a review of the following ...
0
votes
1answer
98 views

Circuit or component to detect temperature change

I know this is a very simple question but I didn't find the answer. I have very less knowledge in electrical. I want a component or a circuit or whatever, which I can attach to a heating coil so that ...
3
votes
1answer
216 views

Thermal calculation for a D2PAK with a SMT Heatsink

I am trying to calculate the junction temperature of a D2PAK FET that is dissipating 5W. The junction-to-case thermal resistance is 0.4 C/W. The junction-to-ambient (PCB mounted, steady state) ...
-1
votes
2answers
137 views

Is there any heat/energy 'lost' to computing power? [duplicate]

I have a Kill-A-Watt Power meter on my computer that has a GPU mining bitcoins. It draws 500W from the wall outlet. My question is, is my computer outputting any less heat than an equivalent 500W ...
0
votes
2answers
204 views

Will utilizing a TIP120 transistor to control the power from 2 9volt batteries in series powering a 12volt fan generate heat? [duplicate]

I want to utilize the below circuit to power a 12volt fan with the components listed. I'm concerned though because when I tried to do this with a resistor, the resistor got -very- hot. I understand ...
2
votes
0answers
122 views

Strange stepper motor behavior- moves too far

I have 3 CD drive stepper motors on a 9V 2A power supply, and they are being driven with EasyDrivers. I am using an Arduino with grbl to control the drivers. The current for the motors is at the ...
1
vote
1answer
64 views

Confusion with unregulated PSUs: RMS current, transformer rating

I'm trying to understand a paragraph in Horowitz and Hill, "The Art of Electronics", under the sub-section "Transformers": "Since a rectifier circuit draws current only over a small part of the cycle ...
1
vote
2answers
138 views

Heating time of an aluminum plate

I'm designing a circuit for my 3D printer's aluminium heating plate (200x200 mm) and I wanted to be sure before buying resistors. Also, I'm using a Sanguinololu 1.3a. I want it to heat at 120° fast. ...
9
votes
2answers
395 views

Warming PCB in a low temperature environment

I have to develop a microcontroller circuit that will run at low temperatures (as low as -60C). I want to heat the FR4 PCB board until it reaches the commercial temperature range above -40C. I found ...
2
votes
2answers
607 views

Make a tea mug heater with a USB power source

For a school project, I have to make a mug heater which draws its power from a computer's USB port, such as this one. I don't mean one that boils the tea, but one that keeps it warm-ish, at at least ...
2
votes
2answers
159 views

Unusual heat rise on rectifier

Trying to refresh my knowledge I was design and construct a fixed unregulated power supply 12V/5A using parts that I have around. Parts are 150VA/12V toroid, an 25A rectifier bridge in KBPC case and ...
0
votes
1answer
121 views

When driving a unipolar stepper as a bipolar with a chopper driver, should I decrease the current to prevent overheating?

I am driving a few stepper motors using a A4988 chip, and my motors are unipolar. The driver I chose is bipolar, so, obviously, I've decided to drive it as a bipolar stepper by leaving out two of the ...
3
votes
3answers
297 views

Motor Driver IC Heats-up

I have a TB6612FNG motor driver module. Here is the manual of the module: http://www.nex-robotics.com/images/downloads/tb66fng%20dc%20motor%20driver%20module.pdf I ...
8
votes
3answers
385 views

Why are external AC/DC adapters almost always single supply rail?

If I have a product that requires several voltage rails internally, why does it make sense for my external power supply to only source a single rail. For instance, if I have a product requiring the ...
7
votes
1answer
1k views

Why does my resistor get warm?

I am currently using 150R series resistors to limit the current to each segment in a 7 segment display. I picked 150R because all the online "led resistor calculators" suggest this value. The power ...
4
votes
1answer
480 views

Is CPU/GPGPU heat dissipation quadratic in clock frequency?

In the following article on overclocking a Pentium from 1GHz to 5GHz using liquid nitrogen: The 5GHz Project, there is an assertion that "Heat dissipation rises exponentially during extreme ...