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Questions tagged [heat]

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

0
votes
1answer
27 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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0answers
64 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 ...
3
votes
3answers
61 views

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

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
65 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
42 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
73 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
44 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
91 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
100 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
95 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
42 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
47 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
154 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
62 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
56 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
69 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
67 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
119 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
443 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
134 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
548 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 ...
0
votes
1answer
69 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
358 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
320 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
64 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
132 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
95 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
179 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
169 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 ...
0
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
75 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
79 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 ...
0
votes
2answers
52 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
votes
0answers
55 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, ...
14
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 ...
0
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 ...
1
vote
1answer
45 views

High-Power H-Bridge - Heating Calculation

Background Hi there, I'm using a H-Bridge to drive a thermoelectric cooler (TEC or Peltier) module. I'm not here to discuss control circuitry/drive voltages/slew rates/switching losses, which I know ...
1
vote
6answers
117 views

Can an electric stovetop burner be damaged from prolonged use without cookware on it? [closed]

My partner, who does building maintenance, thinks that it may be possible to damage an electric stove top burner by extended use without a pot or pan because the heating element doesn’t have something ...
0
votes
1answer
47 views

Compact thermostat for VCO temperature stability

So I have a voltage controlled oscillator with an exponential input made using the THAT2181 VCA IC. The schematic is shown below - the THAT2181 IC is used to change the C4 capacitor charging current ...
2
votes
1answer
112 views

triac burn out problem

I'm working on 2000W furnace controlling with Atmega32a and an optocoupler with BTA40600 triac, my program is designed to heat up the furnace to 850 degree Celsius in one shot (always ON state til ...
1
vote
2answers
109 views

Transistor Power Dissipation / Overheating

I am working on an audio project in which a voltage controlled square wave oscillator drives a 5W 4Ohm Speaker. I am using a unipolar 12V supply. In order to limit the current going through the ...
1
vote
3answers
67 views

Heat Conduction from ceramic resistor to iron rod

I'm trying to conduct a thermal conductivity test. I've set up an experiment where I take a rod of a given material (steel, for example), measure its cross section, length, extreme temperatures and ...
0
votes
0answers
60 views

HL-52S for 1.05kW pool heater and 0.55kW pump

I'd like to create a circuit that can measure my water temperature and based on that turn on or off my pool pump and heater. The heater is a "ECO 5kW" - where it actually uses 1.05kW of power. The ...