NAD PP2 circuit diagram / schematics - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

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 22nd November 2005, 07:35 AM   #1
Werner is offline Werner  Europe
diyAudio Member
 
Join Date: Jan 2002
Location: Belgium
Default NAD PP2 circuit diagram / schematics

Hi all,

months ago I reverse-engineered an NAD PP-2. Here is the conceptual diagram. Note that abstraction has been made of the actual semiconductors, and that the passives numbering does not match that on the PCB.

It is essentially a PP-1 with an MC headamp added to it. Note the copious use of elcaps for coupling. Also note that total MC gain is about 58dB, as opposed to the promised 60dB.
Attached Images
File Type: gif nad_pp2.gif (9.6 KB, 2681 views)
  Reply With Quote
Old 22nd November 2005, 08:02 AM   #2
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
Quote:
Note the copious use of elcaps for coupling

Sickening indeed. If something sells cheap it absolutely needs to be nasty. Lots of free ways to avoid C18/16 but why make the effort?!
And C1? Either paranoia or a really bad opamp.

Thanks for making the effort to publish this. It's nice to know what people mean when they say they like the PP2.
  Reply With Quote
Old 22nd November 2005, 08:52 AM   #3
Franz G is offline Franz G  Switzerland
diyAudio Member
 
Franz G's Avatar
 
Join Date: Jun 2004
Location: Bern / Switzerland
... since I built a phonoclone and a VSPS, I have just one word for the PP2, I used before:

Absolutely junk! Cheap but not worth the money. Makes you thinking, CD's are definitely better than vinyl.

Franz
  Reply With Quote
Old 22nd November 2005, 11:08 AM   #4
ravon is offline ravon  Netherlands
diyAudio Member
 
Join Date: Apr 2005
Location: Netherlands
... since I have a PP2 which seems to do a fair job (although I have not paid the PP2 yet), reading this topic makes me wonder if it is worthwhile making the effort building a VSPS or if it would be better to invest in a better design or if it may be best to simply pay the PP2.

Just saying that the PP2 is a piece of junk is so easy. Could you elaborate on the differences in sound between a PP2 and a VSPS?
  Reply With Quote
Old 22nd November 2005, 12:09 PM   #5
Franz G is offline Franz G  Switzerland
diyAudio Member
 
Franz G's Avatar
 
Join Date: Jun 2004
Location: Bern / Switzerland
Quote:
Could you elaborate on the differences in sound between a PP2 and a VSPS?
My english is not good enough, I fear.

Let's try: the PP2 has no dynamics, bad bass, weak mids, no highs compared to the VSPS or phonoclone.

I used it with a Shure V15-III and a Denon DL103.

My recommendation: build a VSPS!

Kind regards
Franz
  Reply With Quote
Old 22nd November 2005, 12:40 PM   #6
ravon is offline ravon  Netherlands
diyAudio Member
 
Join Date: Apr 2005
Location: Netherlands
I'm afraid your english is good enough for me to understand what you mean

I guess I'll have to find some time to build that VSPS. Let's see...
  Reply With Quote
Old 23rd November 2005, 01:43 PM   #7
Werner is offline Werner  Europe
diyAudio Member
 
Join Date: Jan 2002
Location: Belgium
Another example of how to make (relatively) good sound with less components (than the PP-2) was the LFD / Mistral basic phonostage (LFD MM0): MM and MC with just one 5534 per channel and shared 7812/7912s, no less.

http://www.tnt-audio.com/ampli/trigon_e.html
  Reply With Quote
Old 23rd November 2005, 02:04 PM   #8
diyAudio Member
 
analog_sa's Avatar
 
Join Date: Aug 2002
Location: Sofia
The sad part is that NAD obviously knew how to make a decent phono stage 20 years ago. And it wasn't even high-end Some of their integrateds (3150?) had a very nice sounding phono stage (MM). It used a discrete opamp - Jfet diff input and another 4-5 bipolars and discrete PS regulators. At the time i built a clone using reasonable quality parts - the original parts were indeed horrendous - and quality wise it was easily as good as a Pass Ono. So much for progress.
  Reply With Quote
Old 23rd November 2005, 02:27 PM   #9
Cobra2 is offline Cobra2  Norway
DIY !
diyAudio Member
 
Cobra2's Avatar
 
Join Date: Apr 2002
Location: Stavanger, Norway
Send a message via Skype™ to Cobra2
Thumbs down PP1

Cheap ****...

Arne K
Attached Images
File Type: jpg pp1xxx.jpg (76.8 KB, 2104 views)
__________________
Don't believe everything you think...
  Reply With Quote
Old 23rd November 2005, 02:34 PM   #10
Cobra2 is offline Cobra2  Norway
DIY !
diyAudio Member
 
Cobra2's Avatar
 
Join Date: Apr 2002
Location: Stavanger, Norway
Send a message via Skype™ to Cobra2
Arrow 3020 riaa

"classic-NAD"

Arne K
Attached Images
File Type: gif 3020i_riaa.gif (55.3 KB, 2033 views)
__________________
Don't believe everything you think...
  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
Circuit Diagram epacor Parts 1 3rd February 2007 06:42 AM
I need Owner's Manual, Schematics Diagram djdhemitz Solid State 1 24th August 2006 03:10 PM
Nad NAD C162+C172 diagram(schematics) Bgt Solid State 9 16th January 2005 10:04 AM
ML 383 circuit diagram leigong Solid State 0 29th June 2004 02:13 PM


New To Site? Need Help?

All times are GMT. The time now is 11:50 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