NAP140/NCC200 Clone with PSU - 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 5th February 2011, 09:20 PM   #1
diyAudio Member
 
Join Date: Oct 2004
Location: Denmark
Default NAP140/NCC200 Clone with PSU

NAP140/NCC200 clone with onboard PSU.

Clone of NCC200, but without output inductor.

Schematic doesnt contain the correct values yet and not all the caps/transistors are the right ones. But I wanted to get most of the layout done first to get a feel of the size of it.

Size is about 22 x 12 CM.
Attached Images
File Type: png NAP140-NCC200 clone_BRD.png (184.0 KB, 1240 views)
File Type: png NAP140-NCC200 clone_SCH.png (56.2 KB, 1217 views)
  Reply With Quote
Old 5th February 2011, 10:41 PM   #2
Banned
 
Join Date: Nov 2006
I'm not sure I would want to put the bridge rectifiers on the amp pcb
  Reply With Quote
Old 5th February 2011, 11:17 PM   #3
diyAudio Member
 
Join Date: Oct 2004
Location: Denmark
Quote:
Originally Posted by Melon Head View Post
I'm not sure I would want to put the bridge rectifiers on the amp pcb
Thought about that as well, they might make too much noise.

Maybe Ill leave them off in a new version. Could fit 1 PSU cap more pr rail
instead of the rectifier.
  Reply With Quote
Old 5th February 2011, 11:30 PM   #4
diyAudio Member
 
Greg Erskine's Avatar
 
Join Date: Jan 2002
Location: Sydney/Australia
Quote:
Originally Posted by Neutrality View Post
Schematic doesnt contain the correct values yet and not all the caps/transistors are the right ones.
Hi Neutrality,

I have been caught using generic transistors before. Be careful of the pin-outs of the first 2 stage transistors as optimum PCB design can depend on the pin order, especially when the transistor is connected to a heat-sink. Sometimes you can just rotate them 180 degrees without a problem.

Did you miss the input cap on purpose?

regards
__________________
Greg Erskine
  Reply With Quote
Old 5th February 2011, 11:36 PM   #5
diyAudio Member
 
Join Date: Oct 2004
Location: Denmark
Quote:
Originally Posted by Greg Erskine View Post
Hi Neutrality,

I have been caught using generic transistors before. Be careful of the pin-outs of the first 2 stage transistors as optimum PCB design can depend on the pin order, especially when the transistor is connected to a heat-sink. Sometimes you can just rotate them 180 degrees without a problem.

Did you miss the input cap on purpose?

regards
Generic transistors are just used to get the layout going, I will be going over each of them to check for correct pin out/package and change those who needs to be changed. The same goes for the caps, the ones currently used are just placeholders.

Wrt the input cap, ehm, thats a mistake on my part. I forgot it.

Last edited by Neutrality; 5th February 2011 at 11:39 PM.
  Reply With Quote
Old 5th February 2011, 11:43 PM   #6
diyAudio Member
 
Join Date: Oct 2004
Location: Denmark
Now that I've looked at it again, the input cap isnt missing I just put it the wrong place, it goes from input to ground, well, thats definately wrong lol. C1 should have been the input cap.
  Reply With Quote
Old 5th February 2011, 11:49 PM   #7
diyAudio Member
 
Join Date: Oct 2004
Location: Denmark
Another thing I have been thinking about is spreading the output transistors for better cooling. Better get the most out of the HS.

EDIT: Could make room for double the output transistors. But dont know if the rest of the circuit is up for it.

Last edited by Neutrality; 5th February 2011 at 11:57 PM.
  Reply With Quote
Old 6th February 2011, 05:31 PM   #8
diyAudio Member
 
Join Date: Oct 2004
Location: Denmark
Removed onboard rectifiers, added correct caps, and redid the whole board more or less as the real NCC200 board, but with onboard caps and more space between the output transistors. GND plane has been removed as well. Only thing missing is correct version of 3 of the transistors.

And it is now a single sided board, easier and faster for me to make a prototype this way. Before I spend any real money on a professionally made PCB.

Output transistors will be either MJ15003, BUV20 or BUX20 from Semelab(50A, 350W max dissipation)
Attached Images
File Type: png NAP140-NCC200 clone_BRD_V2.png (187.2 KB, 1132 views)

Last edited by Neutrality; 6th February 2011 at 05:35 PM.
  Reply With Quote
Old 6th February 2011, 07:32 PM   #9
Banned
 
Join Date: Nov 2006
I think you have room to make C1 a film cap as an option.
  Reply With Quote
Old 6th February 2011, 07:38 PM   #10
diyAudio Member
 
Join Date: Oct 2004
Location: Denmark
That was something I have been considering. Theres plenty of room for it.

There should be enough room for it to be a drop in replacement.

But if not, I can move most of the bottom circuit more to the left if needed. One of the reasons why I didnt make it as compact as I could, always good to have more space for changing components.

Currently looking at different versions of the basic circuit, including modifications from SKA Audio. But they might change the circuit to something else, but lets see about that.
  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
Avondale NCC200 module pics IanHarvey Solid State 18 26th August 2012 01:17 PM
Regulated PSU for Leach Amp clone. Dougie085 Parts 0 7th July 2010 03:13 PM
Inv Gain Clone with on board PSU anbello Chip Amps 65 7th May 2008 01:32 PM
GB150 (SKA), GB300, NCC200 and chip-amps Dr.H Solid State 2 1st September 2006 06:06 AM
SELLING: NAIM NAP140 + NAC 42.5 + grey snaic clable aquila.77 Swap Meet 0 5th March 2006 05:00 PM


New To Site? Need Help?

All times are GMT. The time now is 11:45 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