How Do PCBs Work? 

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My solder and repair training in the military, actually included training on repairing internal traces in multilayer PCBs. Our final exam required us to go down to at least the third layer and make a repair, then build up and fix the layers above that we had to disturb to get into the lower layers. A process that takes days to do properly. Repairing surface traces is extremely simple in comparison.

Linus going for the alcoholic carrot vibe 👍👍👍

Everyone was in cable management hell in the 20th century,

linus what's up with that red forehead?

Wow, I never knew they had layers. I can see the connectors for everything on the surface already.

Can you make part 2? Like explaining more about the pcb architecture?

Wow Linus I could watch stuff like this all day! This is so interesting, thank you!

Pink lipstick + makeup?..

lol shots fired at Jayz2cents

woo finally! i've waited for this for years! i pretty much know all about the basics of pcb as i used to be an electronics student back in high school but i've always wanted to see it presented and summarized by linus. more of linus please and less luke.

How about a Tech Quickie on how Sun-block works?!?

I've been looking/waiting for a great video to understand the basics of PCB manufacturing. Thanks for a great vid. :)

01:12 "making it possible to fit a PC in a backpack". No wonder. As the name implies: PCB -> Personal Computer in a Backpack. Everyone knows that :)

i've been waiting for this video for so long. Thank you.

crazy to think ive watched your videos here and at LTT for years now for personal use, but i recently went into sales/customer service for design and fab of Test PCBs and this video helps with the understanding of the specifics

Thanks linus. You explain things so well

I worked in a printing shop for some time and had to do PCBs for a couple clients (not as complex as a PC motherboard), and although really simple it was quite risky because the washing was made with sulfuric acid...... and all done by hand

i love this channel, full of education and linus tech

I've wanted to know about this for so long! Nice video!

I have learned much about computing from you, sensei. You have my thanks.

Why would anyone want to drill through a expensive motherboard, not only is drilling going to damage the motherboard it will refuse to work or Turn On...

Nice video I've always wondered about how motherboards were made

Computerphile also recently made a video on this stuff. This looks like a good follow-up on the details.

Deep learning fast as possible please

these videos just keep getting better XD

Keep explaining us for the Rest of Your LIFE. you are doing a great job!!

Awesome and super clear video!

Linus is feeling the burn 😂

@2:45 I thought that would was coming from the street, got scared as hell

Hey man I’m not a weird or anything but I love you you have educate me so much that is actually help me in my career so I want to say thank you and if you stop making videos I’m probably gonna cry

Why does the CPU socket at 0:14 has a swastika? O_o

I... actually didn't know how that worked before... Thanks Linus!

Great series !!!! 👍👍👍

Happy Birthday Linus :D

Now what I would like to know is how pcbs are made into guitar pickups. Would love to see you guys rip apart some Fishman Fluence pickups and do some explaining....as much as it will hurt to watch lol they claim to not use traditional copper windings but instead use thinly sliced pcbs? The tech has interested me since the first time i saw them. They are some of the best guitar pickups I have ever played and would love to know just how they work!

Lol, I just really like this video and the amount of information it gives me!

Techquickie thanks for your explanation and kind regards.

Very nice video. Thanks.. Very clear information...

Very interesting and informative!

Well explained, cool information,thanks :)

Happy 30th Linus

2:45 *cough* JAY *cough* haha :)

I just got an ad for a product and the ad stared the man him self in the video we are all watching now. Yes the pulseway ad.

Thank you for sharing this video

Going back to this video after 6 years... does Lynda still exist?

Learned about this in HS. We used to make our own PCBs as one of the school projects. We designed the circuits ourselves then we covered the traces with tape and soaked them in acid then washed them afterwards. Ahh nostalgia...

Thanks sir! for usefull information

"How do PCB's work" me: Ok.. lets see what a PCB is xD

Thanks ,i hope i can learn from you.

We built our own circuit board from start to finish in the Army. That was 19 years ago. I still have mine somewhere.

This video has changed my life

I couldn't focus on what Linus was saying this entire video, I was too distracted by Linus' big, red forehead.

2:46 I almost had a heart attack man, I was listening with headphones and it sounds so real😂😅

you really took something out of that 980ti "accident" on your forums linus

Hi, I like your lecture. Thanks

can't get enough quickies from linus

They should do more like this.

Drilling through a motherboard... Jayztwocents springs to mind...

great explantion

best segue ever

@linustechtips There are other ways to manufacture pcbs as well. Some are more suited towards mass production. Your video is good. It covers a more general and broad view of pcbs that is more suited towards the average pc user, but there is more to pcbs than that.

Linus? A second channel? *Chuckles* That can't be possible.

Linus whats is your video editing programs???

That shot at Jay in the description lmao

2:43 helped me understand it a bit better so it just sends power and is easier than using cables idk who thought of this but they smart af.

Hey can you guys do a video about surge protectors... there is really nothing describing what to look for and what the different ratings mean or if it is worth it to get a higher rating.

thank you Good lesson

looks like its nice weather in canada. linus got a bit of sunburn

Thanks, very interesting!

Linus can you explain chips and those other small components

I thought he was going to talk about process control blocks and thought that it was going to be outside the scope of the channel

Some traces have zig zags to keep traces the same length. For example so that signals reach a point at the correct time.

Lord... I’m a noob at this stuff, but you set the record straight when you show the old school TV circuit board.

awesomeness in information

Just when they finally get the color correction correct Linus goes and gets sunburnt...Nice work yo XD

"Coated in a chemical called photoresist" Oh cool, whats that do "Afterwards....." Oh so your not going to tell me. 10/10 educational video.

Thanks I know how they work some what already this help clear things up lol

can you guys do a video on sorting algorithms?

I love the audio levels

Great video. Question, I'm replacing my ebike motor pcb board. The replacement has 7 holes/copper rings for wiring. Bu my original has 6 - 5V, GND, SP, H1, H2, and H3. The replacement has an additional ring for wiring labeled "K". What does K stand for in this case? Keyswitch, ohms, resistance? Can't find any information or diagrams online. And if I solder/connect the "regular" wires, will I have a problem if I leave "K" unsoldered? No info online + could use the help. /bklyn 👑

Thank You linus

another great informal video on stuff. lol.

Hey techquickie, could you do a tutorial on a rocksmith circuit board on the cord, please? A cheap fix? 😉

linus the red-nosed human!

0:54 is it a transistor or vacuum tube TV?

I wish you ordered all the videos for letting us know how we could start

I have many PCB's in my studying table brower but i thought it's a useless thing so i have burned many of them. But now i'll keep it to understand the system so that i can use it to make something cool. Thank you so much for you knowlage video ❤❤❤❤❤❤❤❤❤❤

i have a circuit consisting of a battery, LED, motion sensor and switch. all the components are around 30cm apart connected with wires so how can i program this? would i need to include a PCB and join all the components on there?

what is 2 pin plug on a circuit board with CN2 mean on a power circuit board

If I were to put a vinyl wrap on PCB, would it still function?

It's not exactly how PCB's for motherboards are made. they have traces between top and bottom layers etched too,and You didn't show that. They etch and make 'vias' to connect inner layers and drill holes for outer 'vias' with something called "Maltese cross" marked in inner layers of pcb to perfectly fit the holes from outer layers. my description can be wrong, too but It explained how multi layer PCB's are made :)

Almost always multi layer board with vias. That means each fiberglass layer prior to sandwiching has had a copper layer that was etched. Vias connect desired layers through a solder bridge to the vias which were drilled and look like a ring of metal to the solder. CPUs can do similar things but have bizarre photo / particle etching techniques.

LOL, Linus, you are the one who drill through an LGA2011 motherboard to mount a noctua cooler and broke the motherboard

Thank you Linus

i really got a feeling of jumpscare when the lightning sound effect was played, anyone else...

Anyone know a link to those pens with conductive ink?

Nice video

thx for video

One of you guys might be able to explain this to me. Why do circuit boards have so many un-populated pads? It looks like something could be soldered there, but the trace leads to nothing. I was thinking maybe it was because they decided they didn't actually need the component in a later board revision so they removed it and left the board itself unchanged. But even first model hardware have them!