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Questions tagged [heat]

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

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2answers
86 views

How to take resistance reading when value is effected by measurement?

Context I am trying to measure the wiper resistance of a potentiometer. This is performed by leaving the potentiometer wiper in one position, and measuring from each terminal to the wiper (\$R_1\$ ...
15
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2answers
2k views

Why do BLDC motor (1 kW) controllers have so many MOSFETs?

I have a 1 kW three-phase BLDC motor from China, and I was developing the controller myself. At 48 Vdc, the maximum current should be about 25 Amps and a peak current of 50 Amps for short durations. ...
1
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3answers
58 views

heat dissipation in watts of equipment in a box

Here is the situation, some electrical equipment will be in low ambient temperatures and I need to make it warmer so that there is no damage to it. I want to calculate how much power in watts is ...
0
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1answer
22 views

Can I simply add a 240V Neutral to SONOFF TH10 when replacing wall thermostat

So, I have purchased a SONOFF TH10 wanting to use it to replace my wall mounted thermostat. The thermostat has 2 connections: Always-Live and Switched-Live (which is activated of course by the ...
0
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2answers
35 views

High temperature electrical heater [closed]

I've been trying to put together a relatively simple electrical circuit to heat an electrode to 750 degrees celsius. In theory, is it simplest to persist with using several car batteries (not those to ...
0
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1answer
52 views

Transistor Inverter - when does excessive small wattage become a problem?

I'm trying to choose the best values of resistors given the stock I have so that I can deliver sufficient power and current to an HM-TRP radio module. In this circuit, I used the 100K resistor ...
0
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1answer
30 views

The way to efficiently operate some power devices with less loss, and appropriate heat sharing

I'm using a buck converter(OKR-T/10-W12-C made by Murata Power Solutions). The converter supports 4.5 ~ 14.0V input. The input is 9.5V voltage from the another buck device. And between of them, the ...
0
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3answers
81 views

Cooling of electronic components

I have built an electronic circuit that connects to a 5V power supply. The power supply does get a bit warm when the circuit is operational. The supply is cooled using air convection method. Will ...
0
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3answers
69 views

Connection for tungsten heater

This is my first post, so hello all :) I have a tungsten wire thats wrapped around a crucible. I want to send ~20A through it in order to heat the crucible. Now the tricky part. Since this is part ...
0
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2answers
55 views

How much power is dissipated as heat in a 12V MR16 Led Bulb

I just installed a dimmer for a set of (non-dimmable) MR16 bulbs wired in parallel. The dimmer sits between a 12V power supply and the bulbs. My observation when trying to dim the non-dimmable bulbs ...
1
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2answers
65 views

Create a simple resistive heating element on PCB with Altium

I have created a component with a simple pattern using tracks and arcs as shown in the link below. How to Build Custom PCB Heater Elements However, Altium DRC is throwing errors since I have used 2 ...
0
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0answers
48 views

Why do heaters vary widely in resistance even though they have similar power requirements?

I have a soldering station equipped with a 24V/60W soldering iron. Its heating element (pins 1-2) resistance measures around 50 ohms. The resistance of the thermocouple (pins 4-5) measures around 2 ...
2
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2answers
91 views

install heatsink on BJT

I am facing the problem with the heat of transistor disturb sensor reading. Here the link refer problem I am using BC548 transistor. It is a bit hot when operating because it disipates power around ...
0
votes
0answers
59 views

4-20mA current loop - transmit sensor reading

I am working on design loop current transmitter- to transmit reading value from thermocouple sensor using below design. I measured co-junction temperature using NTC instead of RTD. During applying ...
0
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1answer
37 views

Sensing Of Load In Induction Heating

In New Induction Appliances When you lift the pan from surface of furnace they automatically switch off the power of furnace so my question is How Induction Cooking Appliances Can Know The ...
2
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3answers
1k views

Why do we use a transformer on some heating element projects when the wattage is the same on both sides of the trasformer?

On some projects involving heating elements there's a transformer being used. and the explanation given is "we are using a transformer because need more current" but since the watts on both sides of ...
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3answers
26 views

Making a parallel connection = increasing the total current?

Considering the scheme below simulate this circuit – Schematic created using CircuitLab Am, I understand correct, in real life, if I will step-by-step add the parallel resistors, the total ...
1
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4answers
212 views

Constant current source gets heated

I am trying to control some power LEDs using a microcontroller. For this I plan to use a transistor based constant current source to protect the LEDs from getting damaged and PWM on the base of the ...
0
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2answers
84 views

PID vs Bang-Bang - which one is more stressing on components?

This question is regarding a 3D printer, specifically its heat bed. The head bed is a PCB heater with a resistance of 0.9 Ohms, so it's drawing around 13 Amps when supplied with 12 Volts. I recently ...
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2answers
35 views

The Relationship of Power and Heat to Length of a Folded Resistor

This question is a follow-up to a previous question of mine (The Relationship of Power and Heat to Length of a Resistor). We make heaters in our lab. They are 1.5 inches long and are made using 0.005-...
0
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1answer
107 views

How to calculate the Temperature rise of PCB and its surrounding air from the power PCB consumes?

I am having a difficulty understanding some mechanism regarding heat generation from an electronic PCB (Printed Circuit Board) and its effect on atmospheric temperature. I don't know if this question ...
1
vote
1answer
43 views

Is Adafruit's recommendation for led strip driver MOSFET incorrect?

Adafruit's article ( https://learn.adafruit.com/rgb-led-strips/usage ) states that transistor IRLB8721 can be used with 3.3V or 5V gate voltage to drive LED strip. However, in IRLB8721 datasheet ( ...
0
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1answer
51 views

Heating resistor power limit

This might be a stupid question but, what limits the heat power output of a heating resistor? Is it the temperature that the material can handle, or does the electrical power itself cause a heater to ...
4
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4answers
929 views

Ways to power an Arduino from 24 VDC

I want to power an Arduino (Wemos D1 Mini) with 5 or 3.3 V from my garage door opener, which has 24 VDC available. As far as I understand, this can be solved in the following ways: Step down buck ...
0
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2answers
38 views

The Relationship of Power and Heat to Length of a Resistor

I have two sections of nichrome wire. They are identical in every way (gauge, etc.) except one is twice as long as the other. If I made it so the short nichrome wire received about 8.485 V and the ...
4
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1answer
734 views

What is wrong with this soldering iron?

It's body is blackened, just after 5 minutes of heating and it's body is also bent. How can I solder when the iron itself works so poorly? P.S: I am using it for the first time.
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1answer
53 views

L293D Enable pins can reduce chip heat?

I use a L293D to drive a 7.4V (280mA/phase) stepper motor. I rotate the small motor 1 rev per DAY. The L293D is hot all the time even though the motor turns only once per day. I saw there are “Enable” ...
1
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1answer
89 views

I need Wifi/relay in parallel to push button

First time poster. I’m wondering if you can help. I am trying to make a dumb sauna controller (see pic) smart, so as to be able to turn on my sauna remotely. I am very much an amateur. So be kind. To ...
2
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3answers
84 views

Would I get a better lumen output and improved thermal characteristics for the same wattage if I get a higher rated LED? [closed]

I'm planning on building a bright DIY high CRI LED video/photo floodlight out of the following components and considerations: High-power Neutral White (4000K?) LED rated at 95 CRI No add-on lens so I ...
-1
votes
1answer
263 views

What nichrome wire voltage/amps is required to heat 1 meter [closed]

How can I work out what voltage and amps are required to heat nichrome to: Temperature: 220 F Length: 100 cm Gauge: 20 (0.85 mm diameter, 1.62 ohms per meter) I think I need 7 volts and 3 amps. I ...
0
votes
1answer
50 views

Interpreting a datasheet of resistor for heat sink

I will have this 47k 50W wire wound resistor which will be across line and neutral which means 230 VAC rms. So the electrical power in theory will be V^2/R = 1.2 Watt. How should one interpret this ...
3
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1answer
81 views

How are electric under blankets fail safe?

Electric under blankets are mains powered and yet you lie on them. 240V in the UK. They appear to effectively be a single resistive heating element. Clearly they're not earthed as that would be ...
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1answer
63 views

Drawn current of heating elements in parallel won't add up

I have three heating elements (12, 40W) that I want to connect to a single power source (12V, 16A). If I attach one of the heating elements directly, it draws 2,3A @ 12V. But If I attach 3 heating ...
0
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2answers
192 views

Heat dissipation zener diode and resistor

I have the following circuit When I am testing the circuit with 5V USB 3.0 power supply, the zener diode and/or resistor does not build heat up. Using the 18650 7.4V battery makes it build heat. The ...
1
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0answers
124 views

Soldering sensitive components

I am working on a project called LM317 power supply. The schematic is from the internet, and contains the regulator, filter capacitors, rectifier, potentiometer and protection diodes. I designed a ...
1
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2answers
104 views

Electrical Heater Confusion

I know that a semiconductor material, that is usually used for heaters in variety of application, heat up due to high current, which flows through them or high power dissipation across them. But lets ...
1
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2answers
51 views

Thermo Electric Can Heater / Cooler Heating vs Cooling Speed

I recently purchased a cheap (~$25) 36W thermoelectric cup holder designed to heat or cool a soda can sized object. It works very quickly for cooling and draws about 3A at 12V. For heating, it heats ...
0
votes
1answer
66 views

step down 6V to 2V

I have a 6v 4.5Ah lead acid battery. I need to step down the voltage to 2V to heat a nichrome wire. The wire need 1.7 A to get heated to required temperature. Any suggestions to step down the voltage?
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votes
1answer
58 views

Handlebar heater

I want to make Arduino controlled handlebar heater with kanthal wire. Heater should heat up handlebar(left & right grip) up to 30°C max but I'm not sure how I should calculate required length/...
9
votes
1answer
2k views

Voltage regulator and transistor get extremely hot

I have a 3.3V regulator (L78L33) buffered with a 2N2907A transistor. I am new enough that I might be doing something wrong in hooking up this circuit, so I included both the diagram (copied from the ...
1
vote
3answers
258 views

How to power long (30 ft) nichrome wire from 120v AC wall socket

I am working on making a vacuum forming machine, and I need to power a significant length of nichrome wire off of a 120v AC wall socket. I have very little experience in electronics, but I have talked ...
0
votes
1answer
77 views

Potentiometer is Heating [closed]

I have this light dimmer circuit, when I plug it into the AC, the dimmer works fine but I noticed that the heat in potentiometer is increasing, is there any workaround to fix this problem?
1
vote
2answers
68 views

Waste heat in battery pack - large pack vs small pack?

Are larger battery packs more efficient than smaller battery packs due to "resistance in parallel" rule, assuming eveything else being the same? As an example let's consider two 48V battery packs - ...
0
votes
1answer
109 views

Induction heater [closed]

Please help me out. I am totally confused. I am searching over the internet many times but failed. My question is: Doe inductor coil (chock) decide resonance frequency of induction heating coil, ...
0
votes
3answers
80 views

Calculate how much heat an IC produces

I'm building a device containing a large number of ICs. Now, I'm 99% certain heat won't be an issue. (Considering the volts and amps involved, I doubt you could accurately detect the amount of heat ...
1
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3answers
295 views

How to calculate Junction to Ambient temperature of LED?

I'm trying to calculate the Junction to Ambient temperature for this Cree LED: https://www.mouser.ca/datasheet/2/90/ds--XHP502-1093532.pdf I know how to calculate this: Junction Temp = Junction to ...
4
votes
2answers
449 views

Heating a box (as a thermodynamics dummy)

I expect to build a dehydrator and am knowledgeable enough for most of it (fan, timer, power supply and so on), bar the most important part: the heating element. If you're not familiar with electric ...
0
votes
5answers
178 views

How hot should wires get?

I am using 10 AWG wire to power a BLDC motor, and these wires can get quite hot. When an IC is intended for high power uses, it is common practice to put a heat sink on it, but what about for wires? ...
3
votes
4answers
562 views

Heat problems when using 5 buck/switching converters in a double isolated enclosure?

I want to use 5 step down converters (220 VAC -> 5V DC) inside an enclosure inside an enclosure (double isolation). The step down converters are similar to these. There will be 5 of them, where one ...
2
votes
2answers
148 views

Voltage regulator with heatsink gets overheated

First of, I'm sorry if I'm using the wrong terms or if I'm pointing out something that is obvious to most, this is not my profession, it's only a hobby. I have an input voltage of 12V 5A which is ...