PCB for Nuuk's Buffer - 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 14th September 2005, 01:47 AM   #1
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Default PCB for Nuuk's Buffer

To anyone who has not seen it, Nuuk's buffered passive pre can be seen at http://myweb.tiscali.co.uk/nuukspot/...nclonepre.html

While it is not a difficult design to build on breadboard, a PCB is always easier. Attached is a copy of a slightly modified schematic which adds an input resistor and an input cap as well as small rail caps. You can search this forum to find explanations for each of those changes.
Attached Images
File Type: gif nuuk_buffer_sch.gif (5.5 KB, 1230 views)
  Reply With Quote
Old 14th September 2005, 01:50 AM   #2
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
So, I decided to make said PCB design. The input cap is sized for either a Blackgate N series 1uF cap, or a Solen 1uF cap. The output cap is sized for a 4.7uF Solen cap. The rail caps are sized for Wima 0.1uF caps. All resistor spots are over sized such that they hold Kiwame 2W resistors.

As soon as it seems that the board is correct, I'll post the ExpressPCB files.

edit: nothing like posting to find stupid mistakes. corrected pcb attached.

-d
Attached Images
File Type: gif nuuk_buffer_pcb.gif (22.7 KB, 1201 views)
  Reply With Quote
Old 14th September 2005, 02:12 PM   #3
diyAudio Member
 
Join Date: Jan 2004
Location: Hudiksvall
Hey dsavitsk! Nice work

I'll bet many would like to build that one.

Actually I found that circuit interesting myself so I did a "mono"-pcb some weeks ago to have as a addon-pcb for my "Mr_ED" pcb, have't build it though.

http://www.ettnet.se/~tobias/diy/lm3886/gcbuffer1.jpg
  Reply With Quote
Old 14th September 2005, 03:01 PM   #4
diyAudio Member
 
Join Date: Mar 2001
Location: Brazil
Quote:
Originally posted by tobias_svensk


http://www.ettnet.se/~tobias/diy/lm3886/gcbuffer1.jpg

Any chance to get the actual pcb layout?

Why didn't you try to include the discrete regulators at Nuuk's too?



Carlos
  Reply With Quote
Old 14th September 2005, 05:24 PM   #5
diyAudio Member
 
Join Date: Jan 2004
Location: Hudiksvall
Quote:
Originally posted by carlmart

Why didn't you try to include the discrete regulators at Nuuk's too?
Are you asking me or dsavitsk?
I have regs onboard.

http://www.ettnet.se/~tobias/diy/lm3886/gcbuf.jpg

Cheers
  Reply With Quote
Old 14th September 2005, 06:19 PM   #6
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Quote:
Originally posted by carlmart
Why didn't you try to include the discrete regulators at Nuuk's too?
I guess that's for me ...

Partly to keep the PS seperate, partly cause I ran out of room. ExpressPCB has a deal where one can get 3 boards of this size for $51. Any bigger, however, and the price goes up.

Anyway, here is a small change to add the ability to use Blackgate N 4.7uF caps on the output.
Attached Images
File Type: gif nuuk_buffer_pcb.gif (23.7 KB, 876 views)
  Reply With Quote
Old 14th September 2005, 07:13 PM   #7
diyAudio Member
 
Join Date: Mar 2001
Location: Brazil
Quote:
Originally posted by tobias_svensk


Are you asking me or dsavitsk?
I have regs onboard.

http://www.ettnet.se/~tobias/diy/lm3886/gcbuf.jpg


Tobias,


Yes, you have regulators. But they are LM3X7s. So I asked why you didn't use the discrete ones suggested by Nuuk.



Carlos
  Reply With Quote
Old 14th September 2005, 09:42 PM   #8
diyAudio Member
 
Join Date: Jan 2004
Location: Hudiksvall
Aha.. I didn't read that slow enough

I haven't seen that discreet reg. thing yet, I found the schematics on the "A buffered IGC."- tab.

Cheers

Edit:
Ok looked at it, interesting. Don't know if I could fit it on that board if I want it to fit above my Mr_ED will try maybe
  Reply With Quote
Old 6th October 2005, 08:53 AM   #9
diyAudio Member
 
dsavitsk's Avatar
 
Join Date: Jan 2005
Location: Hartford
Here are a few layout updates.
Attached Images
File Type: gif nb1pcb.gif (23.7 KB, 675 views)
  Reply With Quote
Old 7th October 2005, 04:14 AM   #10
diyAudio Member
 
Join Date: Mar 2003
Location: Windsor
While we are looking at Nuuks buffered pre I figured I would post a pic of my board based on his discrete regulator. This was built following the schematics from his site. As it is, it puts out +/-16.5V rock steady. The LM317/337 "preregulate" the voltage to 22V before it hits the discrete regulators. I have seperate grounds for the +/- rails, although this is likely unnecessary.
This is going to be connected to my OPA637/BUF634 preamp that I completed a while back.

G.
Attached Images
File Type: jpg psu-angle.jpg (43.5 KB, 705 views)
__________________
If you take something apart and put it back together again enough times, eventually you will have two of them.
  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
Nuuk's buffer issues valleyman Chip Amps 14 14th March 2008 07:31 PM
Nuuk's Gainclone buffer PSU Stuey Power Supplies 10 13th April 2007 10:31 AM
Calling Nuuk. Colescuttle Everything Else 3 17th January 2007 07:47 PM
Pcb for Nuuk's buffer endia Chip Amps 9 23rd December 2005 09:10 AM
Nuuk's buffer's current draw (and power supply) dsavitsk Chip Amps 0 16th April 2005 11:04 PM


New To Site? Need Help?

All times are GMT. The time now is 08:11 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