OPA627 + BUF634 Preamp PCB Design - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 26th May 2004, 01:17 PM   #1
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Default OPA627 + BUF634 Preamp PCB Design

Hi!

Any comments on my PCB layout and how to improve it?
Is the grounding good enough wth the jumpers?

The pot is a Noble 50K dual log.
Attached Images
File Type: jpg preamp.jpg (95.5 KB, 5907 views)
  Reply With Quote
Old 26th May 2004, 01:20 PM   #2
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Here is the schematic:
Attached Images
File Type: jpg preamp-sch.jpg (90.5 KB, 6166 views)
  Reply With Quote
Old 26th May 2004, 01:23 PM   #3
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Read this thread if you want to read more about this preamp and others who have buildt it.
  Reply With Quote
Old 26th May 2004, 01:28 PM   #4
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
I think the layout is fair but somehow I don't like your efforts to create a groundplane. Probably it will work fine but I would still suggest that you have ground under the opamps and two traces with v+ and V-, close to the IC's. I would also suggest compactness and smaller parts if possible.

Maybe you should have the BUF's close to the outputs of the opamps? Try to get the physical layout similar to the schematics.

Why don't you consider a pcb with groundplane? If you are going to make it yourself it's real easy with a groundplane. Just put brown parcel tape on the upper side. Se picture below.

Click the image to open in full size.
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy
  Reply With Quote
Old 26th May 2004, 01:31 PM   #5
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Quote:
Originally posted by Alcaid
Read this thread if you want to read more about this preamp and others who have buildt it.
This is more or less the same but with SMD parts.
Schematics here
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy
  Reply With Quote
Old 26th May 2004, 01:35 PM   #6
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Quote:
Originally posted by Alcaid
Here is the schematic:

Hi,

Are you sure you need R5 & R15? It negates the effect of the buffer. What's the value of those resistors?

Jan Didden
__________________
If you don't change your beliefs, your life will be like this forever. Is that good news? - W. S. Maugham
Check out Linear Audio!
  Reply With Quote
Old 26th May 2004, 01:35 PM   #7
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Quote:
Originally posted by peranders
....Why don't you consider a pcb with groundplane? If you are going to make it yourself it's real easy with a groundplane. Just put brown parcel tape on the upper side. Se picture below.
Now that's an easy way to get a ground plane!
Maybe I'll do that, and have all ground on top layer.
  Reply With Quote
Old 26th May 2004, 01:37 PM   #8
Alcaid is offline Alcaid  Norway
diyAudio Member
 
Alcaid's Avatar
 
Join Date: Nov 2003
Location: Klepp
Quote:
Originally posted by janneman


Hi,

Are you sure you need R5 & R15? It negates the effect of the buffer. What's the value of those resistors?

Jan Didden

50R
  Reply With Quote
Old 26th May 2004, 01:41 PM   #9
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Quote:
Originally posted by Alcaid


Now that's an easy way to get a ground plane!
Maybe I'll do that, and have all ground on top layer.
Did you get how I have done?

tape

etch

drill a bit with 3-4 mm drill

very easy
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy
  Reply With Quote
Old 26th May 2004, 01:43 PM   #10
Electrons are yellow and more is better!
diyAudio Member
 
peranders's Avatar
 
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Quote:
Originally posted by janneman



Hi,

Are you sure you need R5 & R15? It negates the effect of the buffer. What's the value of those resistors?

Jan Didden
A OPA627 can't drive a 50 ohms cable at high levels but is this the case?
__________________
/Per-Anders (my first name) or P-A as my friends call me
Super Regulator SSR03 Group buy
  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
AD8610, OPA134, OPA627, BUF634 SMD headphone amp peranders Headphone Systems 75 18th March 2013 09:01 AM
Anyone interested in PCB's for OPA627/BUF634 based headphone amp? Maxhawk Headphone Systems 39 21st February 2013 06:32 AM
My opa549 amp and opa627+buf634 pre Alcaid Chip Amps 40 22nd June 2006 03:21 AM
YardBird OPA627/637 BUF634 preamp/headphone amp Russ White Headphone Systems 4 23rd November 2005 01:53 AM


New To Site? Need Help?

All times are GMT. The time now is 12:22 PM.


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