EEVblog #1365 - Viewer PCB & Circuit Design Review

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Dave answers a viewer technical question about why his circuit is acting up, and goes through a design review outlining the possible problems.
Level translation, clocking, schmitt triggers, line driving, loading, buffering, bypassing, and other aspects are discussed.
If you want to see more design reviews like this please drop a like and comment.

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A series like this is an AMAZING idea! It will give everyone the chance to learn about circuit and PCB design.

chrisgreece
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I probably speak for a lot of your viewers, we would love a series of this format where you walk through a real world viewer design and offer help and opinions and maybe solutions to problems and also general guide lines on PCB design...I personal would love it ! if anybody reads this and agrees please add your comment...cheers.

andymouse
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Definitely continue this series, this is like code review for hardware engineers, super helpful.

monotrope
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Lol I subscribed years ago thinking your channel was more geared towards content like this. I was never disappointed and now I am even happier haha.

CloudandZackst
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I have learnt more in this one short video than I have in a dozen others, please do more like this :)

almostanengineer
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please continue this series Dave, it's interesting.

mdchethan
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There's nothing more enjoyable than following Dave down (or even half way down) a few rabbit holes. A welcome distraction from current (not the electrical kind) events. There are so many considerations when designing even a simple board like this that I sometimes wonder why anything I design actually works. If I don't learn something new from a video like this, I'm at least reminded of a few things I shouldn't forget even when using some classic parts.

mikemike
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To be honest, I really love all the content! The tear downs, the mailbag...!
But your more informational content is what broad me to your channel. I love to hear and see you talking about these things as exactly this is what's missing in other forms of education. I can google formulas and may even be able to properly understand things after a while.
But in the project videos, in the design reviews (should be about your second or third?), deep dives in datasheets... THIS is where we can pick up things that are not available in any other format (apart maybe from apprenticeships), little tips tricks, things to watch out for, all these 20year-experience-things.

Thanks, Dave!
And if you'd like to do these things more I'd be thoroughly pleased :-)

juweinert
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TI's TPIC6C595 is worth looking at. It's a 595 type shift register, but with open drain outputs designed to directly drive relays, lamps etc

jaycee
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And further advice: Use correct time units so you don't fire off the entire show in under a second ;)

ovalteen
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This is the first EEVBlog video I'm watching after getting through most of Ben Eater's 8-bit computer project videos, and being able to understand everything so much more is amazing!!

kei_otake
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This is wonderful. This not only helps the original designer but other people like me that might overlook so many issues. I really look forward to more videos like this.

mfryer
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For those that matter, these are the videos we want to watch!
This type of video might not get the most views, but it's immensely valuable and interesting for those of us working on similar problems.

lloydruberus
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Wow thanks very much!
I'm working on my first PCB project with 74HC595 chips right now and this is a big help.

skye
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I don’t really understand much of this but this guys passionate explanations make me excited to learn, I know I’ll come back to these videos and they’ll be a great resource.

lachydunne
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The Raspberry Pi is a 3.3v chip. Your devices hooked up to the I-O connector must be compatible. The Pi has a very limited 3.3v power output. The Vcc voltage isn't specified. Assuming it's 5v from the relay board this shifts the 595's Vih to over 3.15v With the Pi only putting out 3.3v as a logic high MAXIMUM. The margin is to slim for reliable operation. Try using the SN74LS595 for a lower Vih of 2v.

randycarter
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I love this. With almost every tangent you learn something new, or at least refresh some of the stuff you should know already :)
Looking forward to more of these. Along with fundamentals and repair, these type of videos are my favourite.
Thanks Dave!

koffibanan
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Neat idea using real world examples of circuits with problems and giving your opinions on it. I have read quite about Schmitt triggers and their uses. Just never played too much with them for this case use.
I would love to see more circuits that are having problem and can be solved by you giving your knowledge on the subject.
Great learning experience.

CircularMirror
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Now the thing about forums is that you actually have to read stuff, if you're going to learn anything. It's a lot more fun to sit back, glass in hand, and watch Dave explain it all. So ... Great Job! ... 2 thumbs up from me, for this kind of video.

YoutubeBorkedMyOldHandle_why
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Would love to see more of this. As a beginner with PCB design I could have opened a million and one tabs with all the things you've mentioned. This video is definitely going into my collection of resources.

michael-gary-scott