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Questions tagged [heat]

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

0
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1answer
58 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 ...
0
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0answers
34 views

What material should I use to mount enclosed electrical parts?

We're building an RS-CNC hobby milling machine. We're going to be milling metals. The spindle power supply, the S-360-24 PSU for the motors, the 3 stepper motor driver (TB6600) modules and control ...
1
vote
1answer
37 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
48 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
906 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 ...
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2answers
36 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
714 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
38 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” ...
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1answer
81 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
64 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 ...
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votes
1answer
82 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 ...
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votes
1answer
44 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
75 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
45 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 ...
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2answers
103 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 ...
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0answers
113 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
96 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
47 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
46 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
49 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
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3answers
185 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
64 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
65 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
72 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
69 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
vote
3answers
161 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
445 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
138 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
553 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
143 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 ...
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1answer
83 views

How to calculate the heat dissipated by a battery pack?

I have a battery pack consisting of 720 cells. I want to calculate the heat generated by it. The current of the pack is 345Ah and the pack voltage is 44.4Volts. Each cell has a voltage of 3.7V and ...
5
votes
6answers
378 views

Can I use DC to drive underfloor heating wire?

I'm in the early phases of designing a new underfloor heating controller for retrofitting solar panels to locations with existing underfloor heating cables, which now take their power from the grid. ...
2
votes
10answers
2k views

Heating a tube of aluminium electrically

I need to regulate the temperature of the surface of a tube of aluminium. The tube is used as a mandrel for composite molding/curing, so the target temperature is below 100C. Currently, there is no ...
0
votes
6answers
207 views

Electrical apliances overheating when receiving LESS voltage

I've been wondering for a while now, why do some electrical appliances overheat and burn out when you lower their incoming voltage? Shouldn't the less voltage mean they receive less current, and less ...
0
votes
2answers
77 views

Synchronizing IC Temperatures

I have several separate identical PCBs with identical ICs on them. It's fairly critical for this application that all the IC's are synchronized in regards to temperature. E.g. if one increases by 1 ...
3
votes
6answers
350 views

What's the rationale behind these warnings about extension cords?

(Disclaimer: I've read the help center and I do understand that this is bordering on off-topic since it's about consumer devices. However I hope that I've managed to make enough on-topic by asking ...
0
votes
1answer
68 views

More phase inductance in stepper motor

The selected stepper motor not enough to make required torque. So, I think its better to replace the stepper with higher torque. But, new stepper motor has 2.8mH phase inductance,Old one has 1.2mH. ...
3
votes
2answers
133 views

Is there an upper limit of voltage than can pass through a wire?

The way I understand it, electric wires heat up because there is too much current passing through them. There are tables for various materials, how much current can pass through a given cross-section ...
1
vote
2answers
98 views

Thermal pad thickness

We are going to use GAP PAD HC 5.0 thermal pad to transfer the heat from a FPGA (XCKU040) to a heatsink. My question is regarding the thickness I should choose to obtain best performance. On the one ...
1
vote
3answers
180 views

Do resistors turn electricity into heat?

When wiring resistors to a battery, it generates heat and in the worst case, sets on fire but when it is used to limit current, for example in series to an LED, do they still generate heat ?
4
votes
3answers
172 views

How does current turn to heat/light? [duplicate]

When resistors are serially connected, the current is the same through the whole circuit. To my knowledge, the electric current is electrons traveling. Also, the power of the generator equals the ...
0
votes
2answers
34 views

Question about pressurization and introducing air into a small chamber

This is probably very easy to answer, but I'm working on a project where I need to heat a chamber (insulated Styrofoam container), and my option to heat it is essentially a hair dryer, as a heat gun ...
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votes
1answer
37 views

Relationship between heat coefficient and conductance

I'm involved in a project and part of it involves heat coefficient and heat conductance. What's the relationship between the two, given that the SI unit for heat coefficient is \$W/mK\$ and the SI ...
0
votes
2answers
78 views

Ways to thermally manage a small enclosure?

hopefully this is an okay place to ask this question, but anyway, I'm working on a project to measure efficiency of a mono-crystalline solar cell based off temperature in the enclosure. The solar cell ...
1
vote
2answers
81 views

Thermal stabilization of TH LED (layout recommendations)

I have to develop a circuit for LED-based optical reference. Due to specific requirements, only available LEDs are in TO-18 packages with metal cans. The problem is that LEDs experience spectral ...
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2answers
54 views

USB 5v temp control for stainless steel wire micro heat elenent [closed]

First, I am new to electronics. Is it possible to build a usb or battery powered heating element to heat 1ml of water? How much wire. Needed to hear to 60 deg. c. I need to control temp and also cycle ...
0
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0answers
58 views

Designing a heating element rated for 3kW 240VAC - specs?

I am terribly new to resistance heating, but I understand the general concept. I'm looking to design a heating element using coiled NIC80. If the applied wattage is 3kW and power supply is 240VAC, ...
15
votes
11answers
3k views

Is there a fluctuation effect between heat, resistance and current?

We are told that heat increases a resistor's resistance (or decreases its conductance) and current decreases when resistance is increased. So with less current, less heat would be dissipated, which ...
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votes
0answers
39 views

A heat resistant connection between power supply and a resistive wire circuit (heat grid)

I'm wondering about methods to isolate thermically from the power source a resistive wire circuit (main function: to heat things). I'm sure there is a non-DIY solution (i.e. "buying something") which ...