Hacking Sony DVP-NC650V (cousin of NS500V), need help/schematics! - Page 2 - diyAudio
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Old 3rd October 2002, 10:36 AM   #11
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Join Date: Sep 2002
Location: Maryland
Default Schematics, schmematics

If anyone can advise on a diode mod, here are my PSU schematics:

PSU block diagram #1 (153KB)
PSU block diagram #2 (103KB)
PSU detailed diagram (191KB)
PSU full schematic (342KB)

Back to the output stage... should I just run a Holco resistor directly from the opamp's output pins to the RCA terminal? (The way dorkus did.) Or is there a better way, like running the Holco to the headphone tapping point (so headphones don't get excluded?) What's the 0-ohm resistor doing near the stereo-out, anyway?

Basically, my self-amplified speakers have a "sensitivity" of 800mV (which is considered more sensitive than most non-computer speakers). The NS500/NC650 have 2V output that can be "modulated" to 1V as an option. Does that mean its outputs are "too strong" for my speakers, and I should use a higher-rated Holco (like 1,000ohms) to weaken them?
Thanks,
Leo
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Old 4th October 2002, 08:41 AM   #12
2002tii is offline 2002tii  Norway
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Location: Norway
I would have skipped the headphone (if you don`t plan on using it).
The shorter signalpath you can get, the better sound.

If you don`t overdrive the input on your speaker, keep the 2V output level on your player.
If you drive the speaker input to clipping, then you have to take down the player output. Try with 2V first.

Where did you download the schematics?
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Old 4th October 2002, 10:07 AM   #13
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Quote:
Originally posted by 2002tii
I would have skipped the headphone (if you don`t plan on using it).
The shorter signalpath you can get, the better sound.

If you don`t overdrive the input on your speaker, keep the 2V output level on your player.
If you drive the speaker input to clipping, then you have to take down the player output. Try with 2V first.

Where did you download the schematics?
Over here. I can send you mine if you want, it's 27mb or so.

I actually do intend to use the headphones, because folks at Head-Fi convinced me to upgrade the onboard phones opamp--it would create a decent entry-level headphone amp.

As for output level, I wonder if higher resistors compensate for the overdrive effect?
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Old 4th October 2002, 11:27 AM   #14
2002tii is offline 2002tii  Norway
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Join Date: Apr 2002
Location: Norway
Thanks for the link!
You don`t have to mail it to me, don`t think my mailbox likes that file sice
I tried to download it from your web page, but I only get ca 2Mb before timeout.

I don`t think a higher series resistor will change output voltage noticeably.
I guess you will have to use 2 resistors, one in series with the signal and one from signal to ground.

Don`t remember what it`s called in English...
On Norvegian we call it "spennings deler" = voltage splitter?
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Old 5th October 2002, 03:56 PM   #15
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Well, my speakers are here and the voltage is actually just fine... maybe even too low. I'll try reducing the resistance on the output, the way Chad and Marc have.
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