First pcb. - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 28th June 2009, 10:08 PM   #1
ambed is offline ambed  Latvia
diyAudio Member
 
Join Date: Jun 2009
Default First pcb.

Its actually no my pcb, i found it on internet and i made some changes. Can you tell something about pcb? thanks.
Attached Images
File Type: jpg untitled.jpg (43.7 KB, 414 views)
  Reply With Quote
Old 29th June 2009, 07:38 AM   #2
diyAudio Member
 
jazzman06's Avatar
 
Join Date: Apr 2009
Send a message via ICQ to jazzman06
i know where d you found this! and what changen do yoy do? at the beggining it' very good pcb without any changes
__________________
best regards MAXIM
  Reply With Quote
Old 29th June 2009, 08:31 AM   #3
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Personally I would place the star ground under the output filter.
__________________
/Per-Anders (my first name) or P-A as my friends call me
  Reply With Quote
Old 29th June 2009, 08:10 PM   #4
ambed is offline ambed  Latvia
diyAudio Member
 
Join Date: Jun 2009
i think it will be werry dificult move v-gnd under output filter,I can move this point for some mm to right side, nearer to output. what you say about this?
  Reply With Quote
Old 29th June 2009, 08:38 PM   #5
bbp is offline bbp  China
diyAudio Member
 
Join Date: Sep 2005
Quote:
Originally posted by ambed
i think it will be werry dificult move v-gnd under output filter,I can move this point for some mm to right side, nearer to output. what you say about this?

two 470uF capacitor are needed near the CHIP for PSU bypassing
__________________
calm down and enjoy your time in experiment
  Reply With Quote
Old 30th June 2009, 01:35 PM   #6
ambed is offline ambed  Latvia
diyAudio Member
 
Join Date: Jun 2009
and now will be better??
Attached Images
File Type: jpg bilde.jpg (58.0 KB, 251 views)
  Reply With Quote
Old 30th June 2009, 02:15 PM   #7
diyAudio Member
 
Join Date: May 2008
Quote:
Originally posted by ambed
i think it will be werry dificult move v-gnd under output filter
No. It would actually make most ground traces shorter and the overall layout cleaner.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote
Old 1st July 2009, 06:00 AM   #8
ambed is offline ambed  Latvia
diyAudio Member
 
Join Date: Jun 2009
maybe you can give some good layout which I can a little bit remake ?
  Reply With Quote
Old 1st July 2009, 10:12 AM   #9
ambed is offline ambed  Latvia
diyAudio Member
 
Join Date: Jun 2009
Which ground are better star or ground like in pcb??
Attached Images
File Type: jpg lm3886 pcb rev_2.jpg (69.6 KB, 198 views)
  Reply With Quote
Old 1st July 2009, 11:14 AM   #10
diyAudio Member
 
Join Date: May 2008
That question is a bit unspecific. Any ground scheme is a compromise of several aspects, so you have to define in which aspect you want it to be better.
Better in stability, ease of implementation, economy, etc.

Usually you strife to have the shortest possible path from each component to a star-point at the lowest potential (0V). However the layout will not always permit for the shortest path to every single component. Using a dedicated wire from each component to that point is often not practical. Many wires are also more expensive than few wires, and they take a lot of time to connect and arrange. They also form nice antennas to pick up disturbances from the surroundings.
On the other hand it is not good to unite all return paths in a single wire, because the combined currents lead to a voltage drop across that wire, which means that the ground reference is shifted from 0 V. Signal linearity will be affected negatively by that.

Conclusion is, you have to find the best compromise for your specific project. Start by drawing a star-ground scheme. Then group the ground returns according to their character. E. g. power ground, signal ground or clean, dirty, etc. Analyze, which currents can be combined according to their character and, which currents combined are low enough to not produce a big voltage drop across the wire and which references must absolutely be at the same potential, thus must be combined into a single wire. Then you can form sub-stars e. g. on a PCB.
__________________
If you've always done it like that, then it's probably wrong. (Henry Ford)
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 05:11 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.
Copyright ©1999-2015 diyAudio

Content Relevant URLs by vBSEO 3.3.2