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

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1answer
27 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
51 views

How to design an induction cooktop [on hold]

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 ...
1
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1answer
63 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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1answer
36 views

Impact of positioning of heatsink [closed]

We have assembled a few copper heatsinks, which are custom made. The position of heatsinks in Pcb is in-between the drain terminal tab and Pcb pad. The mosfet is operating less than 100khz range. ...
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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
116 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
27 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
922 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
64 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
39 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
74 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
68 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
56 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
58 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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0answers
38 views

12v water heater cable

I am looking for heater solution which would run on 12v dc. Heater would be used to heat small water volume (3-10l) to temperature 25-28 C. Heater must be aquarium safe. I found ...
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2answers
46 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
76 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
86 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
93 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
votes
1answer
91 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
votes
1answer
74 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
124 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
160 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
342 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
107 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 ...
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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
34 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
77 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
votes
1answer
56 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
votes
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
79 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
77 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
297 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
637 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
56 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 ...
2
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0answers
58 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
49 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?
2
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1answer
26 views

High Temperature Conductor in Air

I am trying to determine what the best material is for a high temperature conductor. It is for distributing power inside a furnace. I need to run at around 1000 celsius (the furnace is hotter but this ...
0
votes
1answer
108 views

How do modern electric blankets implement thermal sensing/feedback?

I'm looking to build my own 12VDC controller for a low voltage electric blanket (specifically, this blanket http://www.amazon.com/gp/product/B0041RQXKE ). An obvious implementation with a ...
0
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1answer
49 views

Heating Surface

I'm working on a school project, which entails heating a polycarbonate surface to melt a small amount of snow accumulation on top of it. The polycarbonate surface is 2 ft x 2ft. Our original concept ...
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2answers
50 views

PCB coating for a high temperature environment

What PCB coating is good for a high temperature environment (my environment is about 30-70 C), and is available in a spray can or so that is easy to implement without need of a device/machine?
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1answer
70 views

Verification on Ohm's Law?

I'm building some Heated Motorcycle Grips and I think my calculations are off. Can anyone help me verify that for 10 feet of 20 gauge Nichrome 60 wire, I have the correct Ohms, Watts, and Amps for the ...
1
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1answer
64 views

PWM a heatgun using a relay

I need to control a heatgun temperature. My heatgun have two different temperatures, one about 300° and another about 400°/500°(something like that) with 2kW max power at 220v. I've connected a ...
4
votes
2answers
301 views

PCB Heater design issues

I'm using copper tracks laid out on an FR4 board as a heater device. It's a serpentine design with the copper 0.3mm wide and 0.2mm spacing. I have three sets of tracks which I intend to heat up at ...
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1answer
54 views

Thermo energy. How does it work and how can i do it!? :D

I see youtube videos where people use heat from their hands and other places on metal to create energy. But most of the time there's a cold side. How does all this work and how could i make a simple ...
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2answers
68 views

How does IR thermal vision work?

How are IR thermal-vision devices able to present us with "invisible" imagery in such a way that we can actually interpret it? What I'm really trying to wrap my head around is: How a sensor can ...
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2answers
115 views

Overheating heating element

I'm making a system that is going to heat water in a 25 liter tank to a given temperature and keep the water on this temperature with a precision of +/-0.5 °C. As I have done some research I have ...
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3answers
211 views

Why are diodes heating up and smoking?

I'm following this guide for battery powering some Adafruit NeoPixels. It states that I should put a 1N4001 diode in my circuit to lower the voltage to avoid having too high a voltage and destroying ...