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

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91 views

Why did I burn my L9110s H bridge

I have recently bought a L9110s H bridge (pictured below), and while testing I accidentally burned it up. I'd like to know why, to avoid making the same mistake and if maybe I should try to get a ...
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0answers
32 views

Heat pipe performance degrading

Compact electronics such as notebook computers often rely on active cooling with heat pipes. Looking into a Fujitsu Lifebook right now that has its cooler running on "all engines full ahead" even at ...
4
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1answer
441 views

Large capacitors “producing more I²R heating”?

On page 35 of The art of Electronics Third Edition, when describing the disadvantages of reducing ripple by choosing large capacitors, the author writes: The very short interval of current flow ...
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1answer
34 views

CPUs and GPUs temperature ranges

Every integrated circuit, like any other component, have a working temperature range. The minimum ranges are in the commercial grade (if I did dot forget something), while the military/aersopace grade ...
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0answers
36 views

How to distibute power between MOSFETs and resistors in current limiter cirquit

I thinking about making some sort of not-very-big-power hi-side current+voltage limiter, using cheap china SOT-23 P-chenel MOSFET like IRF9310PBF, BSC030P03NS3G or AO4407. But in some user cases ...
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2answers
73 views

If I pass electricity through heating coils will it make heat?

This may sound like a silly question. But if I strip some wires added the connectors and connect them to a heating coil will it heat the coil up? What else would I need to produce heat?
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1answer
53 views

Heating a brass blade with soldering iron element

I am trying to build a ribbon cutter like this. I have completed the rest of the machine with the use of an arduino and a couple of DC motors. I'm stuck with the hot blade.I am not well versed with ...
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1answer
35 views

Connection this heating element with electrical plug? [closed]

that’s are the heating element that i want to know how to connect that with electrical plug link
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1answer
123 views

Better approach for maximizing Cooling Fan Life Expectancy

We are working on a product which is extremely cost sensitive. It generates a lot of heat so we are planning to use a heat sink. For those 'very rare edge causes' where heat sink alone cannot cool ...
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1answer
53 views

Heatsink for diode and mosfet in 12V 15A LC circuit

I am trying to design simple step down bulk voltage converter: This circuit will be 'stepping down' 12V to lower voltages depending on needs (driven by 20kHz PWM with variable duty cycles). The ...
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2answers
93 views

TIP120 transistor overheating with heatsink

The transistor gets really hot even though I am using a heatsink. Have I connected something wrong?
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0answers
18 views

Heat dissipation of DIP packages

When a IC in DIP14 package generates heat, the heat will sooner or later dissipate into the free air. I wonder if anyone here knows some rule of thumb values how much of that heat dissipation: a) ...
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0answers
35 views

Estimate kanthal's temperature by power dissipation

I've a bare Kanthal A-1 wire, And I want to Estimate it's temperature, basically to make a °C vs W plot. In this post Thermal resistance is used to do it as: ...
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1answer
47 views

ferronickel temperature coefficient

I'm heating a ferronickel wire, and I need a reliable measurement of temperature, I was using a thermocouple to do this measurement but the wire is cooled when it's touched by the thermocouple so now ...
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2answers
57 views

How to design an induction cooktop [closed]

I'm trying to create my own simplified induction cooktop. If I'd like to use 120V Mains, what determines the current draw of the coil used (is it simply the resistance of the coil)? Also, I understand ...
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1answer
72 views

Designing a Smaller 2000W Transformer PCB to Run 220V Heating Element on 110V

I'm trying to design a step up transformer that can run my 220V heating element on 110V outlet. I've looked for such transformers through retail, but most of them are bulky and heavy. Is there a way ...
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4answers
2k views

Stacking batteries to get 200 volts and 21 amperes

I need to run an old DC motor that needs 200 V DC, 21 A full load; total 4200 W. I want to see if I can run it on V mount lithium batteries made for cameras. Each battery has: A ...
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3answers
130 views

How to to Use a Nylon Shoulder Washer?

I'm somewhat curious as to how to use a nylon shoulder washer with a bolt. There is an example of this here (http://electronics.stackexchange.com/a/45579/95654), but I can't figure out how it would ...
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0answers
58 views

Large 3D Printer Heated Bed - High Current Resistive Load - Preventing Back EMF

I have been trying to solve a rather troublesome issue for some time now, and will try to provide as much information as possible. In short, I am powering a 3D Printer and its 12"x12" heated bed by ...
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3answers
2k views

Reliability problems with an array of 91 high-power LEDs

I have designed and printed a 4-layer PCB that accommodates 91 infrared LEDs in a 7x13 rectangular layout. This will be used as a backlight for a machine vision project. I am having a problem where ...
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2answers
932 views

Would running a heater for 10 seconds on then 10 seconds off be the same as alternating on and off every 1 second for 20 seconds?

Just as the title implies... I'm curious whether given a heater is on for exactly 1/2 of a period of time does the frequency of the heater turning on and off impact the net result of heat created? ...
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3answers
77 views

Electric Heater Design

Is creating an electric heater really as simple as creating a resistor and connecting a power source? I feel like it shouldn't be that simple. Part of the reason is what values of resistors to use. ...
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1answer
44 views

Can you run wires to an inductive heating coil or will that be a bad idea and why?

I have an inductive heating circuit that runs at around 5A at 24V (I'm estimating here). Is it possible to place the inductive heating coil a distance away from the circuit and connect the circuit to ...
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1answer
92 views

PWM or Variable Resistor [closed]

For a school project, I have to design and perform an experiment of my choice. I have chosen to test the efficiency of variable resistors and PWM circuits by testing the amount of energy wasted (heat ...
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2answers
92 views

Is PWM or voltage control the most efficient way to control a heating element? [closed]

I am thinking about a heating controller for my electrically heated motorcycle coat. It draws about 6 amps at 14V on my motorcycle. My question is whether it is more efficient to drive a heating ...
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1answer
61 views

Make a wire thicker will work to avoid overheat?

I'm new to this community and it's a pleasure to start rolling in it! I have a simple question in regards to wire overheat that I hope you guys help me to solve, any help is deeply appreciated =) I ...
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1answer
73 views

How do I control this power circuit using an MCU?

I'd like to use this heater element for a project I'm working on. It looks like a good product but there is unfortunately not much documentation available, but I think it's basically a simple ...
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2answers
53 views

Diazed fuse heat dissipation

To be more precise, I'm interested in the amount of "created" heat during normal operation from a diazed 16 ampere fuse. How hot will the fuse be after delivered 16A in seven hours with the voltage ...
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1answer
125 views

How to reduce resistor heat? [closed]

I have 240VAC main and from 2 sides of wire 2 resistors 1W 33k... After some time resistors heat up. I don't know why is that? By my calculation, when I have 1 resistor on 120VAC, then power of 33K ...
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3answers
89 views

How quickly would a pocket blowtorch ruin PCB traces?

I need to remove an obtrusive Mini USB port from a small PCB, and I initially wanted to use my Soto Pocket Torch to melt all of the leads at once and remove it. I've tried desoldering braids and ...
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1answer
149 views

Need help trying to design an H-Bridge to power electromagnet

I am trying to design an H-bridge inverter to supply maximum current to my coils. I need to supply as much current as possible so that I can make a electromagnet whose polarity constantly flips so ...
3
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1answer
98 views

Is a resistive coil the most effective heating method for a cylinder in terms of power consumption?

I am trying to find the most power efficient method for heating a metal tube in order to heat up the airflow within it. I came across the Minco mica heater but when I talked to another engineer they ...
3
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1answer
114 views

How to add frequency control feedback loop to a circuit for an inductive heater

I am interested in a design made by an MIT student, Bayley Wang, several years ago for a 30kVA induction heater. One engineer on this site with professional expertise examined this circuit and ...
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2answers
401 views

Is higher or lower resistance wire able to heat up more? Are there other factors?

Why is it that low resistance wire in vaporizers are considered to product more heat, yet for my engineering project thin high resistance chromium wire seems to heat up most? According to P = IV and ...
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3answers
215 views

Why and when do SSRs heat?

I'm using a 40A 120VAC SSR to control a 10A resistive load. It gets hot during use. Is this heat associated with the switching, with the load current, or with the voltage? And where does it come ...
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2answers
531 views

Smartest way to use current limit using LM317?

As i understand, using this circuit: Will cause the current to go right through the POT and resistor, which will generate a lot of heat. Is there a better way to use current limiting with LM317 ...
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2answers
122 views

heating a 5 ohm resistance with a 9V Battery

Hi I am working on a project which involves heating a resistor with a 9v battery. I am heating resistance because I want to increase the temperature of a temperature sensor so that I can do something ...
0
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1answer
36 views

calculating circuit for NiCr at a set temp

This may be a primer for most, but this is the first time working with resistance wire and I'm unfamiliar with it's qualities I want to create a circuit that will heat a length of wire to a set temp. ...
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1answer
35 views

Need help making a forced air heater

I would like to make an electric heater. It will have a 20" Lasko Box fan at the back, pushing air passed the Kanthal A1 resistance wire. I would like to use 120vac. It will dissipate 1000 watts, and ...
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1answer
90 views

Chinese glue gun small resistance [closed]

So I've bought Chinese glue gun at ebay, but it had incompatible power plug and terrible cable. I decided to replace wire and plug. I disassembled gun, and saw that wire goes straight to tip (which ...
2
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1answer
59 views

Power dissipation when connecting LED to +-15v

In my audio project that is powered off dual +/-15v rails, I would like to connect a simple LED indicating power on. However, when I connect it with a 1.5k resistor in series (2W), the ~28V dissipated ...
6
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3answers
1k views

Coffee warmer capsule

I want to make a small capsule that you can throw in your coffee and keep it warm (not hot, lets say about 40-50C). In the first place, I don't care about power supply - I will have 2 wire going into ...
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2answers
118 views

Calculating Power and Setup using resistors as heating elements

I looked around at other questions, and either I didn't understand what all I was reading, or it didn't answer my question so if there is an article that I've missed feel free to redirect me. I'm ...
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2answers
94 views

What is the intended use of high current SSRs and triacs?

I answered a question recently regarding power dissipation in solid state relays. This is the calculation: Consider this 40 A rated triac - BTA40. Vto = Threshold voltage = 0.85V = Voltage drop ...
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6answers
2k views

Is a microwave's output power proportional to the mass of its contents?

My friend and I are having a heated debate. On the one hand, he thinks that a microwave oven that is empty, consumes almost no power (not considering lights, lcd, etc). He says that once you put an ...
3
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2answers
518 views

nichrome wire not heating up

So today I was working on a DIY project, that involves me heating up a nichrome wire, and for some reason the nichrome wire is not heating up. I am using a 38 gauge wire, I calculated that I would ...
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2answers
1k views

What wattage heating element required for 500 degree Celsius oven temperature

i have 32 litres OTG oven which is of 2000 watts and can generate Max. 250 degree Celsius . 40 Litre capacity 2000 watts OTG has 2 heating elements, one at top ...
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1answer
63 views

Why do my led bulbs state: not for use in totally enclosed luminaries?

I recently bought some nice inexepensive LED bulbs but I noticed the warning states: (see image below) not for use in totally enclosed luminaries I am guessing that it gets too hot but I find it ...
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0answers
61 views

Fixing a heated water dish: Pointers to a temperature table or guide for power resitors?

I'm fixing a heated water dish, used so that the dogs don't have to eat snow. The previous dish was heated with a wire embedded in what appears to be ceramic, on a foil back on the bottom side of the ...
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1answer
56 views

IC out of oven after baking

Is it ok to take out the ICs/components from oven immediately after baking hours? Or is there a standard cool down temperature before opening of the oven after baking?