NAD C-521 schematics? - diyAudio
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Old 29th October 2003, 02:07 PM   #1
guti117 is offline guti117  Austria
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Default NAD C-521 schematics?

Hi!

Can anyone please help me find those schematics?

I would like to remove the "muting transistors" as many people do to their cd-players, anyone done that?

Any other easy mods for this one?

Thank you
Peter
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Old 30th October 2003, 05:45 AM   #2
sangram is offline sangram  India
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I think you have to buy a CD from NAD with the schematics on them. There is a page on the web about modding the c521i, but it's not been updated in a while.

The player looks pretty well built, but the two things I would like to do is replace the NE5532 opamps and drop the muting transistors. They should not be a problem to identify - there are only 4 transistors in that line but I didn't have time to do a circuit trace. I will be doing it once the player arrives from my previous location.

The other mod I can think of is to clean up the supply by adding more transformers. currently there is only one. Some damping will not hurt either. Plus I added spikes. Seemed to marginally improve the sound. You will need good cable, the stock cable is decent but can be improved. I home-made my cable and am pretty happy with it.
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Old 31st October 2003, 09:06 AM   #3
guti117 is offline guti117  Austria
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Have you tried different opamps?

Please give me an update on those muting transistors if you can.
Thank you.
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Old 1st November 2003, 02:53 PM   #4
sangram is offline sangram  India
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No, I haven't yet done anything - I just opened it for 10 minutes to take a dekko and see what are the possible areas I could work on. I will hack it up soon enough. Will keep you posted.
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