How to remove solder from heat-sink connected pcb board ?
Hey, i want to remove some mosfets from a pcb board, but this boards backside is covered with aliminum (or other heat-sink material). On the board my solder iron easily melts the solder of smd resistor and capacitors, but it cant melt the solder on mosfet connection points. I dont understand why ? I did everything to melt it but it didnt work. ( also 500 degrees hot air didnt work) Maybe solder is lead based solder or maybe heat transfer is so good that i cant melt it. (but iron is melting easily other components solders on the same board.) I really have to replace these mofsets please help me...
What is “thermal paste” and “heatsink,” and do I need them to build my PC?
Thermal pastes and heatsinks are meant to dissipate heat from heat-generating components in your system. Typically, these include your CPU, graphics card, motherboard chipset, RAM, voltage regulator modules and possibly several smaller components on the board.In short, yes. You ABSOLUTELY NEED a heatsink and thermal paste (for your CPU, anyway).A typical desktop CPU can use anywhere from 30 watts to over 200 watts of power. All this energy in one spot creates a lot of heat. This heat must be dissipated in order for your CPU to function. Without it, your CPU will overheat and may either temporarily or permanently stop working. Similarly, a graphics card also produces a lot of heat, though that is a bit different.Be warned when purchasing a heatsink and thermal paste for your PC.-Buy appropriate cooling solutions for your processor. If you have a low power or low energy consumption part, you do not need to spend lots on your heatsink and paste. Alternatively, don’t skimp on paste and a heatsink with higher power parts.-Most processors come with a free heatsink and paste in the box, known as a stock cooler. This is fine for most applications. It may be a bit noisy and not the best, but it works. See if your CPU comes with a stock cooler before buying a heatsink and paste. These cooler come with Intel CPUs that don’t have a “K” or “X” at the end of the processor name and Ryzen CPUs that don’t have an “X” at the end of the name. See below.-All graphics cards come with a cooler already attached, no need to buy aftermarket graphics card coolers unless you really want the look or extra cooling performance.And that’s it. Good luck building your PC! Do you have a parts list or links I could take a look at? I’d love giving you some advice.
I've often seen heatsinks as just another piece of metal attached to the processor. If you absolutely couldn't get another fan, could just adding more metal be the answer?
Like most have mentioned, yes, and I want to also say that in fact, adding more heatsink fin is even more effective solution than additional fan.Let's take a look at this deviceThid is argurably the most famous and iconic fan cooler in the world, Cooler Master Hyper 212 evo, notice that it is in single fan configuration.Going from Intel stock cooler which basically only have a fan to this single fan + heat sink tower configuration, you could improve your CPU thermal performance by 20 - 30 degree (Celcius)You can actually mount a second fan to this cooler (on the otherside of the heat sink tower) with one fan pushing the air and other pulling it in - this will improve your performance for about 5 degree more.Notice something here?Going from fan to fan + heatsink improve your performance much more efficiently than having more fan or bigger fan.And now let's take a look at this deviceThis is Noctua Nh-d14, argurably the best consumer grade CPU air cooler in the world. This thing perform better than the one above for about 15–20 degree more (going of from memory, not remember exactly)Yes it has two fan but even in single fan model, the performance isn't that far off. The much bigger aspect is that it has two towers with more heat pipes (the “legs” that connect with tower with the base) per side of the tower.Again, a much more substabtial performance improvement is gained through the addition of heatsink not fan.Thus as a rule, what really help cool your CPU is the heat sink tower, the fan is there to support it for longer use session.
Can the LM7805 Voltage Regulator be used alone to convert 12v dc from car battery to 5v dc 1000ma?
No, for 1000 mA (1 A) you need a LM78S05 (2 A rated) or LM78T05 (3 A rated), or equivalents. The 7805 generally goes into shutdown or protection mode at over 600 mA (don't ask ME why). Connect the centre pin &/or tab (internally joined) to negative (ground, common to I/P & O/P). The +12 V input is one outer pin and the other outer pin is the +5 V O/P. Look them up in a drawing of the IC in a databook or online. Even though I have used hundreds of these I look them up every time, and it is always best practice to check. There are similar devices with different connections. All these devices need an electrolytic cpacitor of at least 1 uF connected across Input to ground and from output to ground, to prevent instability and potential oscillation. Ensure that each capacitor is connected the same way round. You will also need to bolt the tab, using an M3 nut and bolt, to a Heatsink of at least 10*C/W or better. The heatsink will be connected to the centre pin. You are also advised to feed the whole thing with a series fuse rated at 2A, to prevent fires and setting light to your car or its' wiring. Applications info should be available on the device datasheet. Just try entering LM7805 or LM78T05 into your browser and look for the Datasheet. Not all manufacturers make "S" or "T" models so also try entering 7805, 78T05, etc.
What are the symptoms of a failing CPU Heat Sink Fan?
Over the past few week I have noticed some irregularities from my computer tower such as; 1. Mild high pitched buzzing noise that lingers for about 10seconds at a time. This occurs only a few times a week but as of late the buzzing is becoming a bit louder. 2. Spontaneous power loss that only occurred 5 times in one hour. I resolved this by unplugging and replugging my secondary hard drive. I have not experienced this problem since. 3. Beeps that occur about 3 times in one day. It's usually a short 1/2 second audible beep. I opened my tower case and realized the my CPU heat sink fan is spinning slower than my case fan and to me it looks strained. Also when I put on my computer this morning the fan did not automatically start the first time. Only after shutting down my computer and putting it on again did it start automatically. Could the above symptoms be caused by this CPU fan problem?
Does desktop memory (not overclocked) need a heat sink? What about NVME SSD?
Normal use is fine.However, if you push the limits of a NVMe SSD, it will get very hot. You can get special NVMe SSD adapters with a small cooling fan.There is no reliable report I have seen which will tell you where the danger zone starts. NVMe SSD’s initially came out with shorter warranties. Since then Samsung have cut back the 10 year warranty to 5 years for their Pro SATA SSD models which matches their Pro NVMe SSD’s.My advice would be that gamers & maths programmers who know they are pushing their hardware will know that there is a risk & should consider extra cooling. Even a few more big case fans & a water cooled CPU will take heat out & maintain good air circulation. Current knowledge suggests this is adequate for all except the most extreme applications when using a top quality SSD.Ordinary mortals will gain no noticeable advantage with the NVMe SSD & are unlikely to generate extreme heat which would cause a problem.This only refers to the usual configuration where the NVMe SSD is the operating system.With dual NVMe SSD’s - one OS & one rapid data access, only the OS NVMe SSD will overheat.
How do i know if a cpu fan/heatsink will fit in my case?
if im changing my cpu fan/heatsink, how do i know it will fit in my case and also not obstruct my cpu's auxiliary power connector? do i have to actually measure the inside of my case? or is there some kind of standard i should look for so i know the device will fit in my computer? note: im using an atx motherboard and case
If heat rises does cold sink?
It is not the ‘heat’ that rises, nor is it the ‘cold’ that sinks.It is the ‘less dense material’ in a gravitational field that rises. Something has to fill the place that fluid came from, and that material is the more dense material. Temperature is one property that affects the density of materials.Note that hotter material is not always the less dense material. Our favorite is good old water that decreases in density as the temperature falls from 4 deg C to 0 deg C. That is why water freezes from the top down.