6502.org Forum Projects Code Documents Tools Forum
It is currently Fri Nov 22, 2024 10:52 am

View unanswered posts | View active topics


Board index » 6502.org Users Forum » Hardware

All times are UTC




Post new topic Reply to topic  Page 1 of 1
  [ 3 posts ] 
  Previous topic | Next topic 
Author Message
BigEd
PostPosted: Wed Jun 01, 2022 2:23 pm 
Offline
User avatar

Joined: Thu Dec 11, 2008 1:28 pm
Posts: 10985
Location: England
As these got a mention in another thread, I thought it might be worth surfacing them:

EEVblog #859 - Bypass Capacitor Tutorial (33mins)

EEVblog #1081 - Are Bypass Capacitors REALLY needed? (35 mins)

EEVblog #1085 - Bypass Capacitors Visualised! (34 mins)

Thanks to drogon and tmr4 for linking them!
Top
 Profile  
Reply with quote  
GARTHWILSON
PostPosted: Wed Jun 01, 2022 6:06 pm 
Offline
User avatar

Joined: Fri Aug 30, 2002 1:09 am
Posts: 8543
Location: Southern California
Interesting. On that second one, I wonder what kind of ICs were all over the board, like if they were 74LS which don't seem to need the bypass capacitors as badly as CMOS ones do. In this short(ish) video interview with Jeri Ellsworth, she tells about developing an FPGA product and then getting an urgent call saying that it didn't work, and they needed her to fly to China immediately to troubleshoot it. The dev board she used had power and ground planes; but they had laid out the board again to be cheaper for production, and left all the bypass capacitors out, which turned out to be why it didn't work. They thought they could do that because on the dev board with power and ground planes did work without the bypass capacitors. My understanding is that two parallel planes separated by such a small distance basically have no inductance (as long as you don't get too close to the edge).

_________________
http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?
Top
 Profile  
Reply with quote  
drogon
PostPosted: Wed Jun 01, 2022 7:30 pm 
Offline
User avatar

Joined: Wed Feb 14, 2018 2:33 pm
Posts: 1488
Location: Scotland
BigEd wrote:
As these got a mention in another thread, I thought it might be worth surfacing them:

EEVblog #859 - Bypass Capacitor Tutorial (33mins)

EEVblog #1081 - Are Bypass Capacitors REALLY needed? (35 mins)

EEVblog #1085 - Bypass Capacitors Visualised! (34 mins)

Thanks to drogon and tmr4 for linking them!


There's another of interest here:

https://www.youtube.com/watch?v=crs_QLuUTyQ - EEVblog #1176 - 2 Layer vs 4 Layer PCB EMC TESTED!

This is the one where he tests a 4-layer board vs. a 2-layer board - in this case he re-designed the Gigatron from it's original 2-layer to a 4-layer board.

-Gordon

_________________
--
Gordon Henderson.
See my Ruby 6502 and 65816 SBC projects here: https://projects.drogon.net/ruby/
Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 1
  [ 3 posts ] 

Board index » 6502.org Users Forum » Hardware

All times are UTC


Who is online

Users browsing this forum: No registered users and 35 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
6502.org is an ongoing project by Mike Naberezny and contributors.