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

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6answers
154 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 ...
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2answers
62 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
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1answer
41 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
69 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
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1answer
132 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
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4answers
75 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
120 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
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1answer
37 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
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1answer
68 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 ...
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1answer
104 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 ...
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2answers
93 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
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2answers
96 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 ...
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2answers
45 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 ...
6
votes
4answers
380 views

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

Its quite common knowledge that heat is bad for electronics. That constantly high temperature decreases the expected lifetime of computer parts even if it's not overheating per se. If, for example, ...
2
votes
2answers
173 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 ...
2
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0answers
179 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. ...
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1answer
112 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
192 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
73 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 ...
2
votes
1answer
106 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) ...
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2answers
111 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
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2answers
147 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
103 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
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1answer
59 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 ...
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2answers
123 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
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2answers
345 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
389 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
139 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
96 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
239 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
351 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
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1answer
878 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
317 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 ...
4
votes
2answers
450 views

How does electricity produce heat, and where do the electrons go?

When electrons flow through a conductor it is subject to resistive loss, which has the unfortunate capability of producing heat from this current, leaving us with less current in the other end of the ...
0
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1answer
127 views

PCB thermal isolation from 230VAC-12VAC transformer

I was thinking on creating a dual layer PCB where on one side I would put the MYRRA (45043) AC-AC PCB mount transformer, and on other side the remaining components. In other words I would have the AC ...
5
votes
1answer
241 views

Why do opposing magnetic fields in the same core cause the core to heat up?

I inherited a choke of an odd design, with two windings on the same core. Separately, each winding was about 30 uH. In series, they were about 90 uH. When used in a split-bus boost converter, one ...
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0answers
160 views

How can I isolate a short (in a mobile phone in this case)

I have a Nokia 6030 cell phone, and it's been serving me 7 years. It developed an interesting problem, which looks like a short of some kind: the battery drains very fast, for an hour or so, and the ...
0
votes
1answer
327 views

Arduino + Ethernet Shield = Overheating

I am quite new to the science behind electronics (long time software guy), but here is my issue. I have an Arduino UNO and an Ethernet shield attached to it, all powered by a 7.5VDC wall wart, rated ...
5
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3answers
199 views

Micro-scale solar thermal power

Are there any practical methods of converting solar thermal energy into electrical power on very small scales, eg: using a 300mm diameter paraboloid reflector with temperatures of approximately ...
3
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2answers
448 views

Heater buzzing in AC triac circuit

The problem is that my 1200 watt conventional heating element is creating a mechanical buzzing noise. Shown below is a schematic of my setup: PD4 is the output from a 5v microcontroller and is ...
6
votes
2answers
188 views

What are the physical mechanisms of core loss, and how can they be minimized?

Suppose you have an inductor in a boost converter. The core gets hot. Why? What are the physical mechanisms that cause core loss? Eddy currents? Magnetic domains flipping? Coupling to materials ...
16
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2answers
1k views

What is killing my MOSFETs

This is my first post here on electronics stackexchange. I am a hobbyits in electronics, and a professional in programming. I am working on a inductor circuit to heat a workpiece. I have a working ...
5
votes
2answers
296 views

How do I determine safe distance from a choke to prevent accidental coupling?

In most of my power converter applications, I end up with a choke of some description, somewhere in a steel chassis. I have seen and heard tell of situations where the choke couples to the steel of ...
1
vote
2answers
258 views

Cannot find efficient current/voltage regulator to power LEDs

I have a 12V 4-pin common-anode RGB PWM'd signal being used to power some LED strips, and I would like to use it to power the VL-H01RGB00302 Vollong 3W RGB High Power LED - which is basically a set of ...
2
votes
1answer
92 views

Are there any issues in using traditional switches with an Arduino?

I'm using an Arduino Micro for my project. I'm planning on using two switches as digital inputs. One is for an override switch and a setting switch, but their functions aren't particularly important. ...
2
votes
2answers
292 views

Why do some Integrated Circuits get so hot?

I was reading an article about Radeon 6990 recently and it was recommending 1200 Watts of power supply and the entire machine to be kept dipped in mineral oil because air cooling would kill it in a ...
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0answers
155 views

Arduino building a pulse proportional thermostat

I'm not much of an engineer, but I have worked with arduino. I'm looking to see if it's possible to build a pulse proportional thermostat with a probe and an arduino. Any recommendations on where to ...
1
vote
1answer
312 views

Why does the nichrome heat up?

If I have a copper wire and a nichrome wire of the same gauge (e.g. 30 awg) with the same current passing through them. why does the nichrome heat up significantly. Also, the length of the wires are ...
1
vote
1answer
108 views

What is the temp velocity of Nichrome?

I have read here and here that nichrome of a certain gauge requires a certain amount of amps to reach a certain temp. e.g: 30awg nichrome requires 0.92Amps to reach 205 Degrees Centigrade. With 1 foot ...
1
vote
1answer
296 views

Keeping the output of a heated LM317 constant

I have built a power supply using an LM317: simulate this circuit – Schematic created using CircuitLab When the supply is on for a rather long time (several hours) with a respectable ...