Lm4780 SS PCB - Page 8 - 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 17th February 2012, 07:49 AM   #71
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Glad to help.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 26th February 2012, 10:05 PM   #72
diyAudio Member
 
Join Date: Nov 2010
Location: Vranje
Send a message via Skype™ to tesla017
Default info

Hello from Serbia

I want to build this revision of chip amp. Special tnx to pinkmouse for nice revision of PCB. I want to build Stereo Amp so here I am

I mark all components to the sch file so if someone who build can tell me are this is ok?

Click the image to open in full size.

One more question, why are PGND1, PGND2 separated from GND, SG1, SG2, CHGND, OG1 and OG2 ?

Thanks for all.
  Reply With Quote
Old 26th February 2012, 10:49 PM   #73
diyAudio Member
 
Join Date: Nov 2010
Location: Vranje
Send a message via Skype™ to tesla017
Larger image:
http://www.dodaj.rs/f/1R/Eo/3HPHPbMo/1/sch.png
  Reply With Quote
Old 26th February 2012, 10:50 PM   #74
diyAudio Member
 
Join Date: Nov 2010
Location: Vranje
Send a message via Skype™ to tesla017
Default Smallsized image

Sorry for small image in previus post:
http://www.dodaj.rs/f/1R/Eo/3HPHPbMo/1/sch.png
  Reply With Quote
Old 27th February 2012, 12:25 AM   #75
diyAudio Member
 
blueskynis's Avatar
 
Join Date: Aug 2007
Location: Niš
Send a message via Skype™ to blueskynis
Hi tesla017,

you have some major errors in your posted schematic. Please look more carefully at LM4780 datasheet.
__________________
Windows-free with Linux
  Reply With Quote
Old 27th February 2012, 12:38 AM   #76
diyAudio Member
 
Join Date: Nov 2010
Location: Vranje
Send a message via Skype™ to tesla017
Default Hello

blueskynis tnx for fast replay

All this values of components I take from here:

http://www.unisonus.com/pl/p/file/c6...80_PCB_sch.pdf

I download data sheet, witch schematic i shoud watch...All schematic are difrent than pinkmouse version. I see that mute function is using like soft start the values are 8K2 and 15K resistors and 10uF. What else is wrong?
  Reply With Quote
Old 27th February 2012, 08:09 AM   #77
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Quote:
Originally Posted by blueskynis View Post
Hi tesla017,

you have some major errors in your posted schematic. Please look more carefully at LM4780 datasheet.
I don't think so, my circuit is an exact copy of the datasheet, (apart from component values that I explained on the first page) and works well. Can you explain further?
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 27th February 2012, 08:16 AM   #78
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Quote:
Originally Posted by tesla017 View Post
One more question, why are PGND1, PGND2 separated from GND, SG1, SG2, CHGND, OG1 and OG2 ?.
Hi Tesla. That's just a workaround to aid laying out a star ground, if you look at the pcb you can see what I mean. As for component values, they are all on the datasheet, the standard stereo layout. You may have to recalculate the soft start values for your voltage rails, but that data is given in the datasheet as well.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 27th February 2012, 08:27 AM   #79
diyAudio Moderator
 
pinkmouse's Avatar
 
Join Date: Apr 2002
Location: Chatham, England
Oops, it looks like the datasheet has been revised since I did this layout. I'll try and find an old copy that I worked from, that should clarify matters.

edit: Right, I can't find an old copy of the datasheet, but as my work was based on that of Brian and Peter, you can use the schematic from the Audiosector website for component values.
__________________
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 27th February 2012, 09:06 AM   #80
diyAudio Member
 
blueskynis's Avatar
 
Join Date: Aug 2007
Location: Niš
Send a message via Skype™ to blueskynis
Quote:
Originally Posted by tesla017 View Post
blueskynis tnx for fast replay

All this values of components I take from here:

http://www.unisonus.com/pl/p/file/c6...80_PCB_sch.pdf

I download data sheet, witch schematic i shoud watch...All schematic are difrent than pinkmouse version. I see that mute function is using like soft start the values are 8K2 and 15K resistors and 10uF. What else is wrong?
Hi,
  • Rz1 and Rz2 should be 2R7 ohms, not 22k
  • R1 and R2 should be 22k, not 2R7 ohms.

@pinkmouse

I was commeting on his schematic not yours. Your schematic is in accordance with the datasheet.
__________________
Windows-free with Linux
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
sonic differences between inverting/non-inverting LM4780 VS both non-inverting LM4780 jarthel Chip Amps 5 19th July 2007 12:37 PM
LM4780 from who? jarre Chip Amps 6 10th August 2006 07:04 AM
lm4780 p/s j9184p Power Supplies 4 28th June 2006 04:18 PM
anybody tried a LM4780? travis Chip Amps 162 23rd March 2005 08:14 PM
lm4780 odysseybmx414 Chip Amps 2 22nd February 2005 06:13 AM


New To Site? Need Help?

All times are GMT. The time now is 12:11 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2