OPA549 Gainclone Layout - 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 15th January 2005, 05:08 AM   #1
n00beR is offline n00beR  United Kingdom
diyAudio Member
 
Join Date: Mar 2004
Location: efiF
Send a message via MSN to n00beR
Question OPA549 Gainclone Layout

Hi All,

I have been regitered here for a while now, but haven't made any contributions

I was wondering if you guys would be so kind as to have a look at my OPA549 Gainclone design.
My design is just "copies" of others I have seen, and jumbled around a bit to make it my own

I'm new to circuit design so all comments, tips and suggetions are welcome.

I will post the eagle file incase anyone wants a closer look.

But for now here is a screen shot:
Attached Images
File Type: jpg 549.jpg (42.8 KB, 3505 views)
  Reply With Quote
Old 15th January 2005, 08:30 AM   #2
n00beR is offline n00beR  United Kingdom
diyAudio Member
 
Join Date: Mar 2004
Location: efiF
Send a message via MSN to n00beR
Default OPA549 Gainclone Layout

... and here is the eagle file:
Attached Files
File Type: zip 549.zip (4.5 KB, 462 views)
__________________
::bleh::
  Reply With Quote
Old 15th January 2005, 10:23 AM   #3
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
There is no connection between signal ground and power ground.
  Reply With Quote
Old 15th January 2005, 10:25 AM   #4
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
also the gain is too high for the OPA549.
You have a voltage gain of (22/1+1=) 23.
Try something like 11. (1k and 10k resistors.)
  Reply With Quote
Old 15th January 2005, 11:03 AM   #5
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
The output trace from pin 1,2 is too thin. The OPA549 can deliever 8A continuous.
  Reply With Quote
Old 15th January 2005, 11:11 AM   #6
n00beR is offline n00beR  United Kingdom
diyAudio Member
 
Join Date: Mar 2004
Location: efiF
Send a message via MSN to n00beR
I have applied your suggestions Alcaid, nd have attached the new image below.

Would this implementation suffice?
Attached Images
File Type: jpg 549v0.1.jpg (85.5 KB, 3030 views)
__________________
::bleh::
  Reply With Quote
Old 15th January 2005, 11:18 AM   #7
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
These chips need a low gain because of their low GBP, but remember that with a gain of 11 you need some more gain in another stage like an active preamplifier (or just an opamp circuit in the amp). I use a voltage gain of 3 in my DIY preamp, and 3 x 11 = 33 which would be sufficient.
  Reply With Quote
Old 15th January 2005, 11:25 AM   #8
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Instead of using a jumper, you could connect SG-PG like this:
(The PCB will be a little bigger though)
Attached Images
File Type: jpg 549.jpg (45.1 KB, 2963 views)
  Reply With Quote
Old 15th January 2005, 11:32 AM   #9
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
+ a little Eagle tips:
Try to use a standard grid of something like 50 mils or 25 mils (grid set to inch) instead of 0.0001mm or what you were using. With that grid it is almost impossible to put the components/traces where you want them.
  Reply With Quote
Old 15th January 2005, 11:44 AM   #10
n00beR is offline n00beR  United Kingdom
diyAudio Member
 
Join Date: Mar 2004
Location: efiF
Send a message via MSN to n00beR
Quote:
Originally posted by Alcaid
Instead of using a jumper, you could connect SG-PG like this:
(The PCB will be a little bigger though)

LOL you beat me too it alcaid that was my next question, or could i join pins 3, 6 and 8 as they all connect to ground? or does this cause other problems?
Attached Images
File Type: jpg 549v0.1-jumperless.jpg (83.8 KB, 2263 views)
__________________
::bleh::
  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
Birth of another gainclone around OPA549 abid_rehan Chip Amps 22 10th May 2007 01:59 AM
p2p opa549 gainclone HIPCHECK Chip Amps 3 13th January 2005 08:43 PM
opa548/opa549 gainclone amp kozak Chip Amps 4 8th September 2004 02:12 AM
p2p gainclone layout Greg Erskine Chip Amps 27 25th August 2003 10:09 AM
Gainclone layout check.. Tensop Chip Amps 10 17th July 2003 07:11 PM


New To Site? Need Help?

All times are GMT. The time now is 01:23 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