Electricity supply for NAD PP1 phono preamp

H

Hund-of-Doom

Active Member
I recently got myself a bargain deal on one of those without the electric chord. How should I proceed? Do I risk breaking anything if I plug in an adapter with higher or lower voltage than the original (15v DC)?

When I browse my drawers with tech junk, I found one 12v DC and one 19v DC adapter. Could any of these be of use, or should I get myself a 15v Dc sharp adapter, period?
 
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I wouldn’t know and wouldn’t argue. But please see attached image. Or am I misunderstanding something? I know less than zero about theoretical electronics (and practical too, for that matter).
 

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Translated into subhuman English: that means I can’t pop in any old router chord I happen to stumble upon? It has to be that specific, otherwise the entire concept about boosting electronic signals for better souns will go to shambles?
 
heyraz said:
You need a dual rail DC power supply.
3 wires:
+15vdc,-15vdc,ground.
Plug in anything else and you'll blow out the chip.
Click to expand...

No he doesn't, and it won't. It's a standard 2 conductor socket. The 12volt adapter he has will likely work, and perhaps even the 19v though that's not recommended.
 
Hund-of-Doom said:
Translated into subhuman English: that means I can’t pop in any old router chord I happen to stumble upon? It has to be that specific, otherwise the entire concept about boosting electronic signals for better souns will go to shambles?
Click to expand...

Your 12volt one will likely be fine but do check to see if it indicates that the tip is positive and the outside barrel is negative. Low voltage won't hurt but reverse polarity might.
 
heyraz said:
You need a dual rail DC power supply.
3 wires:
+15vdc,-15vdc,ground.
Plug in anything else and you'll blow out the chip.
Click to expand...
That isn't what's shown in the picture.

My guess (without searching the net for a circuit diagram) is that the circuit is based on op-amps which are biased to half the supply voltage and a range of power supply voltage will be fine. 12V will probably be ok and certainly won't blow anything up if it's too low, but signal headroom will be reduced.
19V will probably be ok too. Just be careful with the polarity of the DC plug.
 
rothwellaudio said:
That isn't what's shown in the picture.

My guess (without searching the net for a circuit diagram) is that the circuit is based on op-amps which are biased to half the supply voltage and a range of power supply voltage will be fine. 12V will probably be ok and certainly won't blow anything up if it's too low, but signal headroom will be reduced.
19V will probably be ok too. Just be careful with the polarity of the DC plug.
Click to expand...
My bad. Deleted original post as incorrect.
Thanks for pointing that out.
 
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