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

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heating problem - L7805C [duplicate]

I'm using a L7805C voltage regulator , to power an SMPS circuit. But its getting heated after 10 min or so , even if I've put a heat sync. SMPS IC is used to convert +5V to -9V.
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0answers
17 views

SMPS 85-265 Vac to 32 Vdc doesn't work for a long time

I'm developing a SMPS and I'm having some problems with heating. Firstly here is all information about the SMPS: Input: 85-265Vac Output: 32Vdc - 48W Flyback design IC: UC3842 Inductor size: EE28 ...
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4answers
92 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 ...
1
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1answer
102 views

DC-to-DC voltage booster mosfet heat problem

I'm tying to understand boost and buck converter designs. Recently I made a prototype of a simple boost converter, used this as a reference. Used parts are as follows: Transistor - IRF3205 Diode - ...
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0answers
39 views

What is the Best Heat Resistant Translucent Materiel? [migrated]

I am looking for a materiel that can be used in a non commercial environment that will allow all (or nearly all) light to penetrate but will not allow heat through (i.e, heat resistant). To better ...
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0answers
34 views

fuse metal alloy with high springiness?

Is there a fuse alloy that would have the same springiness as this except with a little wire that comes out and that plugs into something, so that it could be machined and pressed from one single ...
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0answers
49 views

transistor heat dissipation

In a transistor, the collector is kept most wide among the three regions. Why is that so? If it is for dissipating heat, then why most heat is generated in the collector and not emitter?
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1answer
68 views

Class AB amplifier becomes hotter, using more current and then becoming even hotter

In the circuit above a Class AB amplifier (this is one also called Class A+AB) can be seen with Q1 and Q3 used to get the current biasing voltage for Q2 and Q4. transistors Q2 and Q4 become hotter ...
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0answers
29 views

Correct number to use for thermal analysis

When I'm going to do thermal calculations for a chip, say for a heat sink design. I usually look at the maximum total power the chip will draw, and assume that is the maximum heat it will dissipate. ...
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1answer
51 views

How to design a heat bed / radiator using resistors?

I have to add some resistors to an aluminium plate on a 3D printer, because it only goes to 67'C without foam insulation. The heated bed currently reads 1.6 ohms (90W at 12V) I wish to add about 96W ...
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1answer
73 views

How Much Heat will a 1800 Watt Bulb Produce?

I plan on placing a Metal Halide 1800 watt bulb 20 inches in front of me (not exactly in front but over my head) - will this produce more heat than I can handle? Someone said the question was vague ...
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1answer
39 views

What is a reasonable sustained current load for a typical AA Li-Po battery?

I would like to build a cutdown mechanism for a balloon's nylon rope using NiChrome wire. To make the cut-down mechanism as simple and cheap as possible, I want to stick to using AA batteries. To ...
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3answers
3k views

Why does a processor get hot?

I would like to understand how the computation process causes the processor to get hot. I understand that the heat is generated by the transistors. How does the transistors generate the heat ...
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0answers
85 views

How to Drain Heat from a High Intensity Lightbox (2200 watt)? [duplicate]

As you may know, I'm working on designing a "lightbox" that will contain 3 high intensity metal halide bulbs - consuming a total of 1600 - 2200 watt. The purpose of the box is to generate ~40,000 lux ...
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1answer
29 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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2answers
80 views

Can I safely place a 60w between a 50w LED and a large heat sink that can dissipate 100 watts?

Today I have learned that Peltier devices can be used to generate electricity. I have a set up with a 50 watt LED which is glued to a very large heat sink that cools it without any fans (that can ...
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1answer
69 views

Is there a thermal sensor technology that can measure an object heat at a distance of 10 meters for Arduino or atmega micro [closed]

I am looking for a thermal sensor with a distance of 10 meters . In my plan , I would like to recognize objects based on the heat. for example car.
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3answers
83 views

Generating heat?

I'm an electronic enthusiast (unfortunately I don't have much knowledge on the subject past basic components and volts, current, watts, etc) and I am wanting to know what the best/simplest method ...
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0answers
66 views

Understanding power dissapation of MOSFET's

I'm currently trying to understand how MOSFET's work in total but come across confusing information when looking into power dissipation of the mosfet; mainly how to calculate it. Say I have a circuit ...
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1answer
52 views

Which MOSFET is best for me? [closed]

I plan on driving a heating coil of about 1.4 Ohms from a 3-4V power source; which gives an current draw of 2.14-2.85 A. So Watts from the following info is 6.42-11.4 W of power. The MCU will output a ...
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2answers
34 views

Best way to control heater coil in portable application

I have a resistance wire (kanthal) that is about 2 ohms; with a power source of 3.5V. I'm trying to figure out the most efficient and portable way to control the coil; I'm toying with a mosfet right ...
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0answers
55 views

Why does load position affect dissipation of MOSFET [duplicate]

I am trying to use two MOSFETS to pass AC through a load but i noticed uneven temperatures between the two switching devices. In the configuration Below the lower FET heats up more than the upper ...
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2answers
127 views

Is a relay with a 20 amp rating enough to handle the current from a residential hot water heater?

In Israel the houses usually have a hot water cylinder on the roof of the building which is attached to a solar water heating unit, but which also is connected to an electric heating element which is ...
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1answer
125 views

What is the formula for Nichrome

Having no knowledge of electricals, I am interested in learning the applications of Nichrome. I understand it has swg ratings. But what I am looking for is a formula that can calculate a particular ...
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2answers
57 views

Led Strip Heating Up

I have an LED strip with 7.2 Wattage/m and the strip is 3 meters long. The led strip has R,G,B,+12v inputs and I have connected a 12V DC 1000mA power supply to the +12v and attached transistors to ...
0
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1answer
37 views

Designing a Power signal plane to draw heat from a PoE Module

I am designing a PCB that would be powered by this PoE Module. The PoE module provides 5V output and drives a microcontroller, ethernet interface controller and other lower power circuitry. I do not ...
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1answer
109 views

Efficient DC battery power heater

Hello Im currently in the process of building a efficient small DC powered heater and would like suggestions. It needs to be the least amount of watts vs. maximum heat output. The closest thing I ...
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0answers
41 views

heating carbon steel tubing and brass valves .5“ OD x .039 wall x 125” total length

My application: heating small diameter hydraulic tubing to 200 degree F. with a single 120 VAC 20 amp power supply. I have used heat trace tape, but am looking for a better way to accomplish this due ...
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2answers
77 views

Heat transfer tape, or paste, or nothing

I am installing a bunch of LM317 and LM337 regulators in TO-220 package. They will have 2 heat sinks on them each. Occasionally they will have to run close to their maximum continuous rating and can ...
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3answers
140 views

Instantly Hot Transistor

I have a TIP42G PNP transistor, and when I used it, it instantly smoked. Would it be because I shorted the base directly to ground? (through a button for the initial turn on, and through a 2n2222 for ...
2
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1answer
140 views

Thermal grease / adhesive: Higher Conductivity & Lower Impedance or vice-versa?

I have been reading a fair bit about Thermal grease & adhesive comparisons. There is a lot of information out there - even including tests made with tooth paste(!), which is mind blowing for me. ...
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2answers
70 views

Solar panels for a DC solar pool pump

Ok - total newbie question here. I'm trying to work out the size or number of solar panels required to run a DC pump for use as a solar heating system for a swimming pool. I've located what looks ...
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0answers
103 views

Best heating cable for a DYI heating blanket

I want to make an electric/heating blanket that will work with heating electric cable. I will use a computer AC adapter that output 19V 3.16A, and this dimmer to regulate the heat and a heating ...
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2answers
357 views

Battery heating up instead of a coil in a simple heat circuit

I am making a simple heat circuit using 9v battery and a coil made up of AWG 18-gauge copper wire (electrical engineering newbie working on a fun project). I followed these steps ...
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3answers
113 views

Making my own kotatsu

I want to make my own kotatsu (a small table with an heating element underneath) and I'm considering using a "heat lamp" as the heat source (one of those aimed at reptiles, fits in a normal light bulb ...
3
votes
1answer
129 views

Choice of heating element (power resistor)

Basically I need heating element which can heat up small volume of air (lets say shoes box size) up to about 60 C degrees. I am going to use 25 V source supply with 2 A current. What I thought about ...
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5answers
852 views

Hot wire cutter. Can I use copper wire

I am not from an electrical background and this might sound silly. What I am trying to do is create a hot wire cutter to cut thermocol(Styrofoam). The sugestions from internet is to use Nichrome but I ...
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0answers
87 views

Are there thermovision cameras available to hobbyists?

Years ago, while investigating a short, it came to me that using a thermal vision camera would help an electrical engineer in a lot of situations. Checking it then, such devices were prohibitively ...
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1answer
244 views

Using a transistor as a heater

I have the task to build and control 35 heaters, 10 W each. I first thought about using power resistors (like in this datasheet) as heating devices, but they'd need high currents in order to get the ...
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1answer
175 views

Can this be reworked with a hot air gun?

I posted before about the Microchip RN4020 (Bluetooth Low Energy) PicTail failing. I have some spare RN4020 modules and access to a heat gun. If I can take this RN4020 off and put a new one on, how ...
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5answers
2k views

What causes cables to get heated up and melt in a circuit? (DC Circuit)

I know lots of current can cause heat but what else? Can too much resistance in thin cables cause heat?
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2answers
111 views

How do I correctly estimate heat output for heater wire

This is based on a problem that came up today. During the course of this problem I realized that I wasn't so sure I understood the relationship between wattage and heat produced. In the past we did ...
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3answers
169 views

Can I put 2 voltage regulators (5V) in parallel to dissipate the heat better?

I connected around 10m of christmas light LEDs to a 5V voltage regulator (lm7805). It gets quite hot, put I can still touch it without burning my finger. So in is within its temperature range (120 C ...
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3answers
106 views

Heat dissipation

I have a computer power supply and I'm wanting to make it a variable voltage power supply but I have to have a load on it which requires some resistance. I have connected a 10 ohm 10 watt at 10% ...
0
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1answer
48 views

Safely Driving a Brushless Motor

I am currently building a quad-copter out of an Arduino. I decided to make my own ESCs using MOSFETs, EMF sensors, and the Arduino. These are the motors that will be driven: ...
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5answers
136 views

How greatly can heat increase resistance?

A conductor has a resistance of 0.001 Ohms, at room temperature, by increasing the heat x100 degrees Celsius how greatly would that effect the conductor's resistance? I'm trying to find the ...
2
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1answer
94 views

What is a typical light bulb screw temperature? Is it safe to put a microcontroller there?

I'm working on a small engineering project that involves putting a microcontroller inside a screw of a light bulb and I need to find what are the typical heat outputs of 60W bulbs and strong (like ...
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2answers
63 views

Max temperature of PTC heater, need tip

I have some difficulty reading specifications for PTC heaters, more specifically the ones on here. I understand that a PTC heater does not, inherently, rise above a specific temperature. In the ...
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2answers
234 views

Heat output element

I'm building a little quiz game in Arduino and I already have it displaying a multiple choice question and people can answer by pressing pushbuttons. But anyways now I wanted to know if it's possible ...
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2answers
203 views

Will an electric heater coil stop drawing power when the surrounding temp is the same as the coil's temp?

I am trying to figure out if I can melt Aluminum cans using a heater coil from a toaster oven. I've already used q=mc∆T and q=m*(Latent heat of fusion) to figure out how much energy is required to ...