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Questions tagged [heat]

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

2
votes
3answers
116 views

Heat dissipation by convection for ICs placed upside down

I'm currently designing a PCB with a couple of fast electronic elements (600MHz ARM, DDR3 ram etc.) and I'm quite puzzled which layer should those elements be placed upon. The product will be closed ...
0
votes
1answer
25 views

Temperature Limits of an E ink Display?

I'm playing around with E-ink displays and I have a project in mind that would have to subject the display to extremely high temperatures (around 110 degrees Celsius). The display does not have to be ...
0
votes
2answers
35 views

Triac switch cause of heating

As a newbie to hardware design, I'm having some trouble picking components. I want to switch a 24V AC Solenoid valve using a triac. According to my research/experience, transistors heat up during use. ...
1
vote
3answers
71 views

Motor Voltage and Current Limit of Brushed DC Motor

What fundamentally limits the applicable voltage in a motor? From what I understand, the input to the motor is a relatively constant impedance (since speed is on the order of 100 Hz) and it is ...
6
votes
2answers
722 views

LM317 - Calculate dissipation due to voltage drop

If I use a linear voltage regulator as LM317: Input voltage = 24 V Output voltage = 5 V (so a voltage drop of 19 V) Mean load = 480 mA (peak load = 700 mA) From the datasheet, I read that maximum ...
0
votes
1answer
35 views

Help understanding amperage of DC motor and heat generation

I am diagnosing an issue in an automotive HVAC system and have been testing the blower motor. I would expect somewhere approximately 8A to 15A of current draw. I have test wired the motor with 14AWG ...
2
votes
1answer
64 views

Do flashlight LEDs normally run hot?

I own a Mini Maglite Pro AA and the chip has a habit of getting really hot. I lubricate and seal every threaded part with Vaseline.
0
votes
1answer
50 views

How do I exactly calculate the amount of heat generated in MOSFET?

I am using two IRFP260N MOSFETs (datasheet) in parallel for my application. I am using it to drive a motor rated at 24VDC and consumes 8 to 10 Amps. I found some answers here and calculated the ...
0
votes
0answers
36 views

What heat sink do I need for a IRLZ44 mosfet running a dc blower (fan) at 12v 7.5a?

I have the following circuit that drives a DC Blower (Fan) 12v 7.5a, can you please help me identify a heat sink that would work for my application? Ideally should be one that can be assembled in the ...
0
votes
2answers
45 views

Small utility heaters

I have found myself needing small heaters, in the 5-10 watt range for various applications in diy projects, preferably powered from 120VAC. The exact wattage is not important, and doesn't have to have ...
0
votes
1answer
48 views

Nichrome Wire No Heating with 9V

I have tried connecting one feet of Nichrome 80 wire ( 22 g ) with a 9V battery. Is this enough to heat the wire?
0
votes
3answers
85 views

Cooling Methods for Voltage Regulators

I have a NCP1117 5V voltage regulator that is on an Arudino Mega. The Arduino Mega, with all of the necessary electronics parts for the project, draws around 200mA when operational. When using a ...
1
vote
2answers
92 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
votes
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
vote
3answers
92 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
votes
1answer
26 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
votes
1answer
57 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
votes
1answer
33 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
votes
3answers
89 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
votes
3answers
86 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
votes
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
vote
2answers
90 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
votes
0answers
50 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
votes
2answers
99 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
70 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
votes
1answer
44 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
votes
3answers
2k 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 ...
0
votes
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
vote
4answers
219 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
votes
2answers
108 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 ...
0
votes
2answers
36 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
votes
1answer
187 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
50 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
votes
1answer
52 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
votes
4answers
946 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
votes
2answers
41 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
votes
1answer
747 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.
0
votes
1answer
63 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
vote
1answer
93 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
votes
3answers
91 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
470 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
54 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
votes
1answer
94 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 ...
0
votes
1answer
93 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
votes
2answers
275 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
vote
0answers
126 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
vote
2answers
108 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
vote
2answers
55 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
78 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?
-2
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/...