The heat tag has no wiki summary.
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0answers
39 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 ...
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1answer
66 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 ...
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1answer
78 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 ...
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1answer
114 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 ...
5
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2answers
123 views
Is it possible to calculate how much heat dissipation and temperature rise will take place in a resistor
Suppose I have a 100 mAh battery at 20V. I connect a 1000 kohm resistor across it. How much heat will be generated and how can I find the temperature rise in the resistor? As the battery operates I ...
4
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1answer
170 views
Heat Sink for SOT223
I am designing PCB a in which I am placing a BSP296 N-channel MOSFET, for switching solenoids:
MOSFET supply voltage is 24V
MOSFET max power dissipation is 1.8W
Max operating temperature is 150°C.
...
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1answer
71 views
What does a beginner need to know to build a programmable heater based on resistance heating?
To build a programmable deep fryer, as a learning project for more serious checmical reactors, I need to build a programmable heat source that can be controlled in response to sensor readings and a ...
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1answer
188 views
Simple circuit Voltage regulator question?
I am trying to build a simple circuit that takes a 9v battery through a voltage regulator that outputs 1.5v across a load resistor . The load will be just a piece of metal that gets heated up.
My ...
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3answers
218 views
Does a resistor in an AC circuit produce the same heat as in a DC circuit?
Does a 1k ohm resistor produce the same heat in a AC circuit which has an rms voltage of 10 volts (60 hz.) as it would in a 10 volt DC circuit?
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1answer
168 views
How do I limit the maximum power, delivered to a heater, through a triac?
I am using the following circuit to turn ON/OFF a heater. Works like a charm. However, I would like to limit the maximum power delivered to the heater. The reasons for this are:
the heater is a ...
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1answer
89 views
Poor RF communications : looking for advices [closed]
I am in charge of a temperature monitoring and controlling project in a new building with 7 floors and 14 rooms by floor.
I installed last week thermostats devices in each rooms permitting to send ...
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3answers
283 views
Sensibility and health hazards of reflowing computer PCBs in a domestic oven
This is a bit of a fringe question, SE-wise, but I think EE is the best place to ask it.
Some acquaintances of mine had a problem with their laptop - the graphics card stopped working. They've ...
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3answers
129 views
Can I draw power for a component while this charger is charging the battery?
So I am working on a design for battery-heated wrist warmers. My mother has Reynauld's and arthritis, and as winter approaches it gets much worse.
My basic design is that I will take a form-fitting ...
4
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6answers
277 views
Would a 100k ohm resistor or motor emit more heat
Would a 100k ohm resistor produce more heat than a motor that had the same resistance?
+|---------(100k ohms)---------|-
+|---------(100k motor)--------|-
Both circuits have the same amount of ...
2
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4answers
142 views
soldering input pins to SN74HC595N shift register — heat tolerance
I'm working on a project that uses the SN74HC595N shift register from TI. The nature of this project requires that I solder on pin extensions. My soldering skills are not too solid, so I'm worried ...
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1answer
116 views
How long do oven elements last under high usage? [closed]
If someone were to use his/her oven to cook five-hour pot roasts every 2-3 days, how long would the oven elements last before they would need to be changed?
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3answers
172 views
Prevent Water Piping from Freezing (price is everything) [closed]
I realise that there are a bunch of specific pre-made solutions for preventing pipe freezing but I think I should be able to do it way cheaper myself (I am assuming that the pre-made stuff has quite a ...
4
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1answer
225 views
Most efficient use of resistors to heat an aluminum plate?
I'm building a reprap printer. I have a sheet of aluminum about 8x8" to use as the print surface, which must be heated to prevent problems while printing. </background-info>
My controller ...
6
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1answer
335 views
MOSFET Over Heating. So hot it's melting the solder
Alright, continuing with the debugging of my new board tonight I found another issue worse than the one before: My switching MOSFET is getting so hot that I'm getting molten solder.
I replaced the ...
4
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3answers
335 views
Heating up a container - most efficient
I got a container that must be heated up to atleast 250 celsius, but I don't have alot of space to work with and I am also not so familiar with this kind of topic.
So I've attatched an image which ...
2
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1answer
235 views
How can I determine the resistance needed to heat a wire to a specific temperature? [duplicate]
Possible Duplicate:
How do I calculate the temperature rise in a copper conductor?
I want to have a AA battery heat up a copper wire .12mm diameter, but want it to heat up to 302°F, not ...
5
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1answer
315 views
Can electronics survive in cooking oil?
I came across this image, showing an apparently working motherboard soaked in cooking oil, using the heat from the electronics to deep fry potatoes.
Like most of the internet, the content is of ...
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2answers
239 views
Which component can control the heat of a hot plate?
About this kind of hot plate I was told, quote:
That's very bad because potentiometer needs to emit power which is sufficient part of all heater consumption. In this case we cannot use ...
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2answers
225 views
How realistic is a 4 ports charging only USB hub mount inside a wall outlet box?
Here's a concept of a wall outlet variation. It's size of a wall outlet (occupies the same size standard box in a wall) but instead of mains outlet it has four USB ports for charging various devices.
...
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1answer
101 views
What material and current do I need for a diy plant heater?
I want to heat my indoor plants with a DIY heater. I thought about using iron to heat up the soil, but I am not sure what material is the best for a heater. Also, what current would it need?
Thank ...
3
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1answer
279 views
Dual primary / dual secondary transformer heat up
I've built this 220v DC motor controller. I use a 2x110v - 2x15v transformer to power up the stator.
The transformer is a Myrra 45064 with the primary windings connected as follows: pins 1 and 9 ...
2
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2answers
443 views
Resistor heat in a LED array
I built a 5x8 LED array using 10mm white (3.3v) LED and 270 ohm 1/2W resistors and a 24v input power (24v 1A AC/DC adapter non-transformer).
Now resistors are very hot (Thermometer shows 56ºc).
How ...
4
votes
3answers
168 views
Name of connector for attaching to bolt
I have a heating element (essentially a very resistive wire) that has two threaded bolt-like connectors on each end. I want to avoid soldering any components of the heating element, so I asked a ...
3
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2answers
482 views
Multiple resistors in series instead of using a single resistor has any advantage: heat produced by the resistors of diffent watts are different?
I have two doubts, requesting you to answer my doubts separately. :)
1) I need a resistance of 'X', so is it better to use a single resistor of 'X' value or multiple resistance of r1+r2+r3='X'?
What ...
1
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2answers
216 views
Replacing a thermal cut-off with a potentiometer
I think this is a pretty basic question but I don't know much about electronics and I could really use some help. I'm trying to modify a hot air popcorn popper to use as a coffee roaster. The popper ...
1
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3answers
366 views
Over-volting an hard disk voice coil actuator
I have disassembled an old hard disk and I making the voice coil move by applying a voltage between the terminals of the coil.
I plan to use this to raise or lower a flag attached to the actuator arm.
...
3
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1answer
198 views
Resistor overheating
I have problem with the model of given power limiter (below are the images). Problem is in the red rounded resistor on the last image - that resistor overheats for some reason (I've put 3 ohm one ...
2
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1answer
334 views
Thermal management of MOSFETS in TO-263 package
I'm using SUM60N02 mosfets in TO-263 package for my car battery charger power unit. In datasheet they have specified thermal resistance:
Junction-to-Ambient - 40 C/W when mounted on 1" square PCB
...
1
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1answer
454 views
How to control and power 25 x 25 nichrome wire matrix
I would like to control and power a 40x40mm size array of 25 x 25 small heating elements which should function just like a visual display of LEDs, but switching heating elements on/off instead. I am ...
3
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3answers
759 views
Calculating the DC voltage and current needed to obtain certain heat with a resistor
What formulas can be used to calculate how much volts and current is needed to get a resistor to heat up to a certain temperature?
I need to get a resistor (or a few next to each other - for more ...
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2answers
118 views
how do you remove heat from a ceramic heat exchange heatsink
I have a ceramic heat exchange chip(10m x 10m). I know you are suppose to lay this on the chip, and lay a heatsink on top of that.
What is the best medium for connecting the heat exchange to the ...
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6answers
456 views
Can a solid capacitor be damaged by a heat gun?
I used a heat gun to solder a 32 pin SOIC IC (DIR9001) and after I was done I saw that a cap nearby (solid cap) got EXTREMELY hot and started to discolor (yellowish hue).
Is it possible that the cap ...
3
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1answer
364 views
Help with Metal-Core PCB
I have designed several typical FR4 PCBs in the past. I am interested in designing my first metal-core PCB (MCPCB) for a circuit that requires high heat dissipation. I am looking for any helpful ...
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3answers
1k views
How do I determine the area of copper needed on a PCB to provide adequate heatsinking for a power SMD MOSFET?
I am planning to use the IRFR5305PBF Power MOSFET (http://www.irf.com/product-info/datasheets/data/irfr5305pbf.pdf) to switch on a load. I have determined that I need an external heatsink with Rthsa ...
2
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1answer
617 views
Thermocouple array for generating free electrical energy?
Thermocouple is a material (junction between two different metals) which generates potential difference in terms of millivolts, isn't it?
Why don't we create a matrix of thermocouples (many ...
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0answers
120 views
Thermodynamics simulation for electronics
I wanted to try some thermodynamics simulation software for heat/airflow in ic enclosures. I was told that SOTA was Pro/Engineer but that didn't like my system. Will I get anywhere with Autodesk ...
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2answers
333 views
What can cause this damage to the GPU?
I bought a computer for a person in which, when delivered, the video card (Gigabyte Nvidia GTX 570) never gave output. The only way the display got basic VESA output was when I moved the card into in ...
2
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5answers
228 views
Low power sensor heater circuit?
I am exploring a project which would require stationing several sensor packages outdoors in a semi-protected environment. I am wondering wether adding a simple, low-power heater circuit to the package ...
1
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2answers
133 views
Electrical device that can generate a constant amount of steam until the device is switch off
May I know if such a device exist? The device can generate a constant amount of steam (given water and electricity) until the device is switch off. After switch on, it will generate the steam again.
...
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2answers
117 views
How and where is energy dissipated in a driven traction motor?
When a fully loaded elevator is moving down its potential energy is decreased and I guess is somehow converted by the elevator traction motor into heat.
How exactly does it happen? What exact ...
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1answer
215 views
How to correctly apply thermal compound to ICs and heatsinks?
From http://en.wikipedia.org/wiki/Thermal_grease
All these compounds conduct heat far better than air, but far worse than metal. They are intended to fill gaps that would otherwise hold air, not ...
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2answers
2k views
Stepper motor getting very hot: wrong driver or power supply?
I have built a simple driver circuit for an unipolar stepper motor, based on an ULN2003A. The schematic:
The motor is a PM25L. Data sheet is here.
It was salvaged from an old electric typewriter, ...
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1answer
194 views
How to build a 27 degree Celsius heat generator / heater
How to build a 27°C heat generator / heater?
Requirements
It must be able to generate heat such that the temperature at a radius of 2m from the generator will be at 27°C ± 1°C ...
3
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4answers
232 views
Protecting low power cables from heat
I need to install a cable which will come in contact with a central heating pipe. It is 2 core carrying 5V, 500mA DC power to a simple circuit that can't run on batteries. The pipe could get to 82 ...
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4answers
2k views
How to carry high current on PCB
I need to pass high current on some part of my circuit. I used an online PCB track width calculator to see that required track width is about 5mm and minimum clearance is 1mm, which makes it about 7mm ...
