NAD PP2 circuit diagram / schematics - Page 2

Aquarium · 28th November 2005, 08:19 PM

I would have to politely disagree with your assessments of the NAD PP-2 as I have found that what you guys say about it in this thread is only partly true.I did get burned once with the earlier model the PP-1 and I agree that it was for the most part a "disappointing" unit,but the PP-2 is different.The thing that won me over was to upgrade the power supply from the "poor" unregulated version that comes with the unit to a regulated one and Voila! bass,dynamics,detail etc.It is so good in fact that it bests a Moth 30V series 12v Phono Stage currently sold online for 275 Pounds-3 times the NAD's price.I lie not as I have done the A/B and the NAD wins.It is a poor sounding unit with that awful stock supply no bass etc,much as described,but once it doesn't have to fight for power it is quite a nice little unit for the money,better than the Creek also I hear.

Franz G · 30th November 2005, 07:18 AM

Indeed, this could be a big change, a good tweak for the PP2, to use a state of the art psu.

But you will still have FOUR electrolytics in the signal path. I for myself, I avoid such a signal path in my phono equipment. Just my personal opinion, of course.

One good cap at the output of a phono pre should do the job. Should you worry about an expensive cartridge, why not a cap at the input or, for a MC, a stepup transformer.

Again: for the same money you spend for a PP2, you easily build a phonoclone or VSPS in very good quality, including psu.

Franz

Aquarium · 30th November 2005, 06:00 PM

You are right,of course it is cheaper to build it yourself,but if you have the stock NAD-PP2 already,a quick upgrade is to replace that unregulated power supply unit.There is a guy on Audiogon that does just that,selling over-priced, larger,unregulated(still) power supplies(up to 1000mA I think).What to do is make sure you get a regulated power supply unit mine is 24VDC 1Amp regulated,really did the trick!

longjohn silver · 22nd January 2006, 08:04 AM

Quote:

You are right,of course it is cheaper to build it yourself,but if you have the stock NAD-PP2 already,a quick upgrade is to replace that unregulated power supply unit.There is a guy on Audiogon that does just that,selling over-priced, larger,unregulated(still) power supplies(up to 1000mA I think).What to do is make sure you get a regulated power supply unit mine is 24VDC 1Amp regulated,really did the trick!

I am thinking of buying a NAP PP-2. Sorry about my ignorance but what do you do with the original power supply?
Thanks

Franz G · 22nd January 2006, 08:53 AM

Quote:

Phono January 2006 (Extra Issue of a german HiFi magazine about PP2):

"... hohe Rausch- und Verzerrungsfreiheit und die niederkapazitive Auslegung."

Translation:

"... low noise and low THD and the low capacitance layout"

What capacitance? The electrolytic caps in the signal path?

Franz

ruby_baby · 28th February 2007, 09:51 PM

What sort of regulated supply are you using? Is it a linear or switched regulated unit? I'm interested in upgrading and have not found a 1A 24V DC linear regulated power supply.

Aquarium · 1st March 2007, 11:17 AM

You should be able to find something like the existing power supply that comes with the NAD PP2 only rated at a higher current output.A 500mA unit will work pretty well also.This guy sells the 1000mA upgrade.http://britaudio.com/NADPP2.html

ruby_baby · 14th March 2007, 05:48 PM

Does anybody know the exact size of the barrel connector for the DC power supply for the PP2? It seems to be smaller than the standard 2.1x5.5 provided with most power supplies.

Aquarium · 14th March 2007, 09:49 PM

The one on my upgraded 24v 1Amp DC Power Supply is 2.1mm x 11mm.The 11mm being the silver tube length itself.These should be available in Radio Shack stores

tubenut · 16th March 2007, 08:46 AM

Bigger PSU always helps on these affordable add on boxes.....
Well sadly, even on my ECP1 from Electrocompaniet too...

The supplied wallwart of the PP2 uses a whole 470mfd of smoothing before entering straight in to the regulator inside the unit. Just adding capacitance there helps a lot, in the box or in the wall wart. Soft recovery diodes as well. That opamp, yes, so many other choices, pick your flavour.

Ofcourse all those electrolytics in the signal path come from the lowest bidder......

WRT to a regulated PSU, I have not tried that on a PP2 yet but I have before on a Electronics and Wireless World design and distinctly preferred +-15 V supplies single regulators to feeding these into another set regulating down to +-12.
Could have been headroom of the PSU or current limiting that made the difference I suppose but thought +-12 should have been fine....

16th March 2007, 08:46 AM	#20
tubenut diyAudio Member Join Date: Nov 2002 Location: South Africa, Jhb	Bigger PSU always helps on these affordable add on boxes..... Well sadly, even on my ECP1 from Electrocompaniet too... The supplied wallwart of the PP2 uses a whole 470mfd of smoothing before entering straight in to the regulator inside the unit. Just adding capacitance there helps a lot, in the box or in the wall wart. Soft recovery diodes as well. That opamp, yes, so many other choices, pick your flavour. Ofcourse all those electrolytics in the signal path come from the lowest bidder...... WRT to a regulated PSU, I have not tried that on a PP2 yet but I have before on a Electronics and Wireless World design and distinctly preferred +-15 V supplies single regulators to feeding these into another set regulating down to +-12. Could have been headroom of the PSU or current limiting that made the difference I suppose but thought +-12 should have been fine.... __________________ Guillaume Croak Audio Exploration

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28th November 2005, 08:19 PM	#11
Aquarium diyAudio Member Join Date: Jun 2004 Location: Adelaide Australia	I would have to politely disagree with your assessments of the NAD PP-2 as I have found that what you guys say about it in this thread is only partly true.I did get burned once with the earlier model the PP-1 and I agree that it was for the most part a "disappointing" unit,but the PP-2 is different.The thing that won me over was to upgrade the power supply from the "poor" unregulated version that comes with the unit to a regulated one and Voila! bass,dynamics,detail etc.It is so good in fact that it bests a Moth 30V series 12v Phono Stage currently sold online for 275 Pounds-3 times the NAD's price.I lie not as I have done the A/B and the NAD wins.It is a poor sounding unit with that awful stock supply no bass etc,much as described,but once it doesn't have to fight for power it is quite a nice little unit for the money,better than the Creek also I hear.

30th November 2005, 07:18 AM	#12
Franz G diyAudio Member Join Date: Jun 2004 Location: Bern / Switzerland	Indeed, this could be a big change, a good tweak for the PP2, to use a state of the art psu. But you will still have FOUR electrolytics in the signal path. I for myself, I avoid such a signal path in my phono equipment. Just my personal opinion, of course. One good cap at the output of a phono pre should do the job. Should you worry about an expensive cartridge, why not a cap at the input or, for a MC, a stepup transformer. Again: for the same money you spend for a PP2, you easily build a phonoclone or VSPS in very good quality, including psu. Franz

30th November 2005, 06:00 PM	#13
Aquarium diyAudio Member Join Date: Jun 2004 Location: Adelaide Australia	You are right,of course it is cheaper to build it yourself,but if you have the stock NAD-PP2 already,a quick upgrade is to replace that unregulated power supply unit.There is a guy on Audiogon that does just that,selling over-priced, larger,unregulated(still) power supplies(up to 1000mA I think).What to do is make sure you get a regulated power supply unit mine is 24VDC 1Amp regulated,really did the trick!

28th February 2007, 09:51 PM	#16
ruby_baby diyAudio Member Join Date: Feb 2007	What sort of regulated supply are you using? Is it a linear or switched regulated unit? I'm interested in upgrading and have not found a 1A 24V DC linear regulated power supply.

1st March 2007, 11:17 AM	#17
Aquarium diyAudio Member Join Date: Jun 2004 Location: Adelaide Australia	You should be able to find something like the existing power supply that comes with the NAD PP2 only rated at a higher current output.A 500mA unit will work pretty well also.This guy sells the 1000mA upgrade.http://britaudio.com/NADPP2.html

14th March 2007, 05:48 PM	#18
ruby_baby diyAudio Member Join Date: Feb 2007	Does anybody know the exact size of the barrel connector for the DC power supply for the PP2? It seems to be smaller than the standard 2.1x5.5 provided with most power supplies.

14th March 2007, 09:49 PM	#19
Aquarium diyAudio Member Join Date: Jun 2004 Location: Adelaide Australia	The one on my upgraded 24v 1Amp DC Power Supply is 2.1mm x 11mm.The 11mm being the silver tube length itself.These should be available in Radio Shack stores

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