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Naim NA322 MM phono board
Naim NA322 MM phono board
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Old 28th November 2018, 10:35 AM   #1
JimSalabim is offline JimSalabim  Germany
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Default Naim NA322 MM phono board

Hi! I have traced the Naim NA322/4 MM phono board PCB layout from some photos that I found online. I didn’t find any schematic, but there were enough pictures and some descriptions so that I could identify the parts.

Anyway I have some questions left:

1. Can anybody tell me if I have identified the transistors correctly? I am not absolutely sure which of the 10 transistors are ZTX384 and which are ZTX214.
It was hard to tell this from the pictures. Unfortunately I don’t understand the circuit enough and don’t have enough background knowledge to really be able to figure this out logically.

2. Is the polarity of the tantalum caps correct?

3. I can use BC560 instead of ZTX214 and BC550 instead of ZTX384, right?

4. Do the transistors have to be matched? And which have to be matched?

Thanks so much in advance!
Attached Images
File Type: png NAIM NA 322-4 PCB.png (107.1 KB, 847 views)
File Type: jpg na322-4 1.jpg (648.1 KB, 791 views)
File Type: jpg na322-4 back1.jpg (678.8 KB, 778 views)
File Type: jpg na322-4 2.jpg (192.5 KB, 812 views)
File Type: jpg na322-4 3.jpg (138.4 KB, 783 views)
File Type: jpg na322-4 4.jpg (139.1 KB, 191 views)

Last edited by JimSalabim; 28th November 2018 at 04:23 PM.
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Old 29th November 2018, 02:59 AM   #2
JimSalabim is offline JimSalabim  Germany
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I have now tried to draw a schematic from my PCB layout. Perhaps this helps? Does the circuit make sense like this?
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File Type: png NA322.png (257.4 KB, 439 views)
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Old 29th November 2018, 07:39 AM   #3
analog_sa is offline analog_sa  Europe
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Naim NA322 MM phono board
Have not checked it in detail, but looks fine to me, if drawn a bit unusually. The two CCSs can be made easier on the eye by mirroring T3 and T9 and positioning T3 similarly to T9.

Good job!
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Old 29th November 2018, 07:42 AM   #4
analog_sa is offline analog_sa  Europe
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Naim NA322 MM phono board
Polarity of the caps is fine an i see no need to match the transistors as there is sufficient NFB to take care of gain mismatches.
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Old 29th November 2018, 10:30 AM   #5
JimSalabim is offline JimSalabim  Germany
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Great, thanks very much! And thanks for the advice about the transistors in the schematic – I’m not used to drawing schematics, so I was aware that it might look bit unusual. But I’m glad it’s not completely unreadable. :-)
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Old 30th November 2018, 10:55 AM   #6
JimSalabim is offline JimSalabim  Germany
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I have drawn the schematic once again. It should look better now and more friendly to the eye :-) Just in case anybody else wants to use it.
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File Type: pdf NAIM NA 322-4.pdf (966.4 KB, 211 views)
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Old 20th December 2018, 06:00 PM   #7
VictorDQ is offline VictorDQ  Russian Federation
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Jim, This clone does not know how close it is to the original.
NJ322Schematic.jpg
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Old 4th January 2019, 03:57 AM   #8
vsmusic is offline vsmusic  Russian Federation
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JimSalabim - Respect ! I'm going to do this scheme .
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Old 4th January 2019, 11:30 AM   #9
JimSalabim is offline JimSalabim  Germany
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Quote:
Originally Posted by vsmusic View Post
JimSalabim - Respect ! I'm going to do this scheme .
Nice! One important thing to notice is that the transistor orientation in my layout is for ZTX834 and ZTX214. The pinout of the BC550C and BC560C is reversed. Just put them in the other way around!
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Old 4th January 2019, 12:03 PM   #10
JimSalabim is offline JimSalabim  Germany
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I have updated the PDF. Now it should be clear.
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File Type: pdf NAIM NA 322-4 updated.pdf (180.7 KB, 263 views)
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