A heatsink dissipates heat into the surrounding air and thus provides cooling.

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34 views

TEC 12706 not drawing more than 1.6A when powered by a 12V PC SMPS

I have recently bought TEC 12706 device from Sunrom.com; The specification says that the device can draw more than 6A current at 15.4V and internal resistance is ~2 ohms. But when I measured the ...
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1answer
41 views

Design of a heat sink, combined with a pc cooling system

I currently have the task to cool a system of four small devices \$ \left(1 \times 5\; \mathrm{cm}^2 \; \text{each} \right)\$ with a total heat dissipation of \$150\$ W. My idea was to use a ...
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1answer
40 views

Where can I find the C/W rating for PI48, PI49 and PI51 heat sinks?

I was wondering if there is any reference to calculate the C/W ratings for PI48, PI49 and PI51 heat sinks? Just for reference, I am referring to these devices: ...
2
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2answers
61 views

Safety/efficiency of a makeshift aluminium can heatsink?

I had recently received a 9v 1A DC wall-wart off eBay, and needed to open it to swap the polarity of the jack to center negative. As I had the case open, my finger bumped against the metal part of the ...
2
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2answers
285 views

Thermal power dissipation for a diode with heatsink

I have a circuit that has a diode that needs to support 3A through it. The supply is at 7.2V and is therefore ~22W. I have currently selected a schottky diode show here. Key specs are it can ...
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3answers
105 views

How can I attach a heat-sink to legacy IC's?

I work (play) with some legacy chips like the mighty TMS9918. Which, if you didn't know, doesn't require a heat-sink but the thing does get really hot. Amazing ...
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3answers
77 views

How use DMM thermocouple probe hands-free to monitor heatsink temperature?

I suppose this is more of a lab practice question than electronics per se, but I wonder if there's a standard-ish way to mount the K-type thermocouple that comes with my Fluke DMM so I can monitor the ...
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1answer
80 views

Area of Copper Needed to dissipate 24 W

I need to know the area of 2oz copper needed to dissipate 24 W. The max temp is 100 C and the ambient temp is 40 C. Any equations I can use?
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3answers
74 views

Which way are heat sinks supposed to be mounted?

Which way are heat sinks supposed to be mounted? With the fins around the component, or facing outside?
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2answers
131 views

How to calculate heat dissipation improvement when adding a fan to the heat sink?

I'm using an LM338 which I want to supply at least 3A @ 20V, with Vin being 35V. I made my calculations and I figured out I'd need a very expensive (for my budget) heat sink so I'm looking for a more ...
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2answers
155 views

Mosfets cooled with Heatsink and fan?

For my circuit, I have mounted heatsinks to my mosfets to dissipate heat. I have below a crude drawing of how the heatsink/mosfet is placed on the PCB I was thinking to integrate a LM35 to measure ...
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1answer
118 views

How to design a heat bed / radiator using resistors?

I have to add some resistors to an aluminium plate on a 3D printer, because it only goes to 67'C without foam insulation. The heated bed currently reads 1.6 ohms (90W at 12V) I wish to add about 96W ...
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1answer
113 views

How Much Heat will a 1800 Watt Bulb Produce?

I plan on placing a Metal Halide 1800 watt bulb 20 inches in front of me (not exactly in front but over my head) - will this produce more heat than I can handle? Someone said the question was vague ...
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0answers
87 views

How to Drain Heat from a High Intensity Lightbox (2200 watt)? [duplicate]

As you may know, I'm working on designing a "lightbox" that will contain 3 high intensity metal halide bulbs - consuming a total of 1600 - 2200 watt. The purpose of the box is to generate ~40,000 lux ...
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3answers
135 views

Anything Wrong with my Light box Design?

I am creating a custom box that will contain 3 * 400 watt metal halide bulbs (1200 watt total). The box will remain closed for 60 minutes, open for the next 60 minutes, then closed, then open and so ...
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2answers
105 views

Can I safely place a 60w between a 50w LED and a large heat sink that can dissipate 100 watts?

Today I have learned that Peltier devices can be used to generate electricity. I have a set up with a 50 watt LED which is glued to a very large heat sink that cools it without any fans (that can ...
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2answers
118 views

TO-220 rectangular washers

The recommended way to mount a TO-220 package is to use a spring clip or bar pressing on the body of device. But the package was designed to be mounted using a bolt through the hole in the heatsink, ...
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0answers
57 views

Cooling the IC on a board printed by hand

I'm building a battery charger circuit with BQ24278. The battery draws 500mA minimum and 2.5A maximum current; therefore, I must prevent IC from overheating. I printed the board onto single sided ...
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1answer
143 views

L705CV Voltage Regulator Overheating [duplicate]

The L805CV voltage regulator is capable of producing a consistent 5v 1.5A draw. I am creating a small raspberry pi case and have a 12v 3a power supply to accomplish the project. I am powering a 12v ...
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2answers
586 views

Can I use LEDs without PCB?

I recently purchased LEDs on ebay that were supposed to come attached to star PCB (as a heat sink). The items I received are just the LEDs (no PCB). They are listed as 3W LEDs, with a forward voltage ...
2
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2answers
123 views

Can I solder high power 1W LEDS on aluminum with 60/40 solder? [duplicate]

I want to create my own light source using high power 1W LEDs. Can I solder high power 1W LEDS on aluminum with 60/40 solder? Here's a picture of a potential heatsink
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2answers
114 views

Can the metal tab at top of a TO-220 package be cut off?

I am using a TIP120 Darlington transistor in a through-hole (specifically TO-220) package, in a very simple application which does not generate much heat. I remember reading that the metal tab at the ...
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2answers
97 views

Heat transfer tape, or paste, or nothing

I am installing a bunch of LM317 and LM337 regulators in TO-220 package. They will have 2 heat sinks on them each. Occasionally they will have to run close to their maximum continuous rating and can ...
2
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1answer
180 views

Thermal grease / adhesive: Higher Conductivity & Lower Impedance or vice-versa?

I have been reading a fair bit about Thermal grease & adhesive comparisons. There is a lot of information out there - even including tests made with tooth paste(!), which is mind blowing for me. ...
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1answer
102 views

is CFM additive?

I currently have a heatsink with 1 (loudish) 1000-1500 CFM fan. If I was to put 2 quieter 500-750 CFM fans on either side of the heat sink, would they effectively push the same amount of air? It is a ...
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2answers
135 views

How do I interpret this thermal curve graph for my heatsink?

Datasheet of heatsink. The heatsink says it's thermal resistance is 24K/W. Let's say my device dissipates 5 Watts. Assume a perfect conduction from the case to the heatsink, and junction to case is ...
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1answer
139 views

How can I mount a DS18B20 tempreature sensor to a large heatsink?

I want to monitor the temperature of a large peltier element's heatsink to control a fan. I think I'm going to use a DS18B20. The 3 pin TO-92 looks like it's plastic, so I'm already worried about low ...
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2answers
140 views

Looking for an efficient audio amp circuit

It seems like all the circuits that I find are using outdated and inefficient technology that requires massive heat-sinks at anything beyond headphone levels. Is there any particular reason that there ...
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2answers
165 views

Will these heatsinks be sufficient for my mosfets?

I need to control 10 12VDC motors at ~25Amps, so I decided to make my own mosfet H bridges to control it ( with 2 n chan et 2 p chan ). I will need 10 H-Bridge, so 40 Mosfets. ( 20 n chan and 20 p ...
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2answers
423 views

How can I remove a heatsink that is stuck to a component soldered onto the PCB?

I am modding a wireless router, and one of the problems I have is that it overheats, so it restarts every hour or so I am trying to replace the heatsink. However, I simply cannot get it off. It ...
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2answers
232 views

Heatsink or IC: how to determine root cause of overtemp?

I have a manufacturing situation where we perform a functional test on a board and we are getting frequent overtemperature failures from a BGA package with a heatsink on it. I would like to be able to ...
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1answer
175 views

CPU heat-sinks for cooling Transistor?

Can I use CPU heat-sinks for cooling transistors? CPU heat-sinks are low volume and they have been made to cooling a sensitive hot Chip and if the datasheet has said that it requires to hold on the ...
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2answers
107 views

Stray-inductance and capacitance of non-isolated heat-sink

I read an application-note that says the heat-sink (when not electrically isolated), is one of major source of EMI. Well I think this can be corrected at some point by good EMI filters and a good case ...
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3answers
2k views

Calculating the output power of Thermoelectric generator

This question is related with my previous question here I am trying to calculate the output power from a specific TEG, here is it specifications, Open Circuit voltage (Voc) = 5.29V Current (I) = ...
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1answer
245 views

MOSFET Heat Sink selection

MOSFET heat sink calculation: I am designing H bridge to drive brushed DC motor . The MOSFET I'm using is IRFB4620PbF. I calculated the MOSFET losses which are 7.8W per MOSFET. I'm not sure if I am ...
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2answers
2k views

Do I need a heatsink for my voltage regulator?

I use L7805CV voltage regulator (TO-220) to get 5 V from a Li-Po 7.4 V 2200 mAh battery. However, after a while, voltage regulator gets really hot. Current measurement showed 200 mA. ...
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5answers
2k views

Why peltier elements have smaller heatsink on cold side?

I have seen in nearly all configurations that Peltier elements are mounted with huge heat sinks on hot side as compared to tiny ones on small side. Is this just a way of explaining the need of heat ...
2
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5answers
738 views

Heat sink, how much does fin and base width matter?

I have lot of aluminum sheet 0.5mm thickness at home, normally heat sinks that I have seen had 1mm thickness. Now I am wondering should I get that sheet welded as heatsink or do I absolutely have to ...
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2answers
250 views

Would a better heat sink be tall or wide?

If we have a heatsink and want to improve it's efficiency would it be better to increase its width or height? What should be the strategy on installing a fan as well? If we increase height and ...
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2answers
267 views

Heat Sink for portable refrigerator

I am thinking of making a portable refrigerator with the above schematics, but I am doubtful that the aluminium frame would be enough of a Heat Sink on it's own. All the peltier elements are of ...
2
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2answers
747 views

How to choose heatsink for power devices (transistor, LED, regulator)?

In many projects I need to choose small, but big enough heatsink for transistor or other power devices (LED, amplifiers, voltage regulators). I know that thermal resistance of many devices is known ...
2
votes
1answer
838 views

Attaching a heatsink to a DRV8825 stepper motor driver

I'm using the Pololu DRV8825 Stepper Motor Driver to control a NEMA 17 Steppermotor with an Arduino. The stepper motor requires 1.7A current. According to the driver specs on the Pololu website, if ...
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1answer
569 views

Designing a copper plate heat sink

I’m trying to see if a copper sheet I have with me (25 cm X 30 cm, 0.05 cm thick. There's a 6 cm X 6 cm square hole in the center to place a lamp.) is sufficient to keep 36 luxeon rebel LEDs (mounted ...
2
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1answer
866 views

Selecting best Heat Sink for TEG (Thermoelectric generator)

I am trying to solve a puzzle about selecting the right heat sink for my TEG, but I am really confused and lost with lots of equations. Here is the Specification of my TEG (TG12-2.5-01L) Module ...
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2answers
1k views

How does power dissipation for surface mount components work?

I know that with usual through hole components we can attach heatsinks etc. But how does it work with surface mount components? Is having a copper plate around the component the way to go? How do we ...
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2answers
386 views

LED lights and heatsink

I want to make a light for my boat roof. If I were to buy these (or similar), would I need to mount them to a heatsink, or would they be fine just as is? The largest size one has a power output of ...
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1answer
80 views

Regime of unsteady flow over heat sink

For my master thesis I'm simulating the cooling of an 2.5D microchip (2 dies next to each other on an interposer (slice of silicium with interconnections)). So I want to calculate the flow over the ...
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1answer
262 views

LM317 TO-220 heat sinking: Junction to case or junction to pad?

I have some LM317 ICs (TO-220) that I'm using on a power supply. I'm trying to figure out the heat sink values necessary to keep the IC under safe operation. All of my requirements are with 700 mA ...
2
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2answers
743 views

TO-220 voltage regulator, heatsink and mounts

I've received my heatsink and mounts for my voltage regulators. It's the first time for me. I'm not sure about the way to mount the regulator on the heatsink. Mainly a little film, not sure about the ...
7
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2answers
567 views

Pick a heatsink for voltage regulator

I have to dissipate \$2W\$ from a voltage regulator. It's a 7805 in a TO-220 package. The datasheet is here. It's the first time I have to pick those so I would like to have a review of the following ...