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Old 9th April 2013, 09:45 AM   #21
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Don't worry .... have you already tested some mods?
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Old 9th April 2013, 10:43 AM   #22
Roushon is offline Roushon  India
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Location: Mumbai (Bombay)
Not yet. At the moment accumulating informations and
taking a closure look at the circuit before attempting any changes. I usually take a little time to start...need to grasp many things...

Thanks
Roushon.
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Old 20th December 2013, 04:49 AM   #23
Roushon is offline Roushon  India
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Join Date: Sep 2004
Location: Mumbai (Bombay)
Default Finally!

Finally, I have began the modification in my Marantz
CD5003. Kindly tell me if I can replace the ICs NJM2068
by AD8620 or LM4562. They are pin equivalent.

At the same time upgrading another player where the IC
is NJM4580. Can this be also replaced by one of the
above ICS.

Thanks in advance.

Regards
Roushon.
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Old 22nd December 2013, 03:28 PM   #24
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from datasheet, NJM 2068 input bipolar, AD8620 jfet.
people in diyaudio, say that LM4562 is good op amp, but bad performance if using as unity gain.

This op amp for filtering high frequency, safe and cheap choice using NJM2114 ( as marantz cd17 or cd6000).
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Old 24th December 2013, 02:57 PM   #25
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Quote:
Originally Posted by Roushon View Post
How does one do this shielding for some particular IC? It will be very good to see some picture.

Thanks and regards
Roushon
you can use, materials are easily around us :
1. cut new pcb, same as ic outline.
2. using alumunium for sealed powder milk cans.
3. alumuniuium from building store.

using silicon seal or double tape for fixing shielding.
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Old 24th December 2013, 03:29 PM   #26
Roushon is offline Roushon  India
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Join Date: Sep 2004
Location: Mumbai (Bombay)
Quote:
Originally Posted by adhiyasa38 View Post
from datasheet, NJM 2068 input bipolar, AD8620 jfet.
people in diyaudio, say that LM4562 is good op amp, but bad performance if using as unity gain.

This op amp for filtering high frequency, safe and cheap choice using NJM2114 ( as marantz cd17 or cd6000).
Thanks Adhiyasa for pointing out the differences between the ICS. I am getting
OPA 1612 which is input bipolar to make the replacement. Hope it is OK.

Regards
Roushon.
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Old 24th December 2013, 03:31 PM   #27
Roushon is offline Roushon  India
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Join Date: Sep 2004
Location: Mumbai (Bombay)
Quote:
Originally Posted by adhiyasa38 View Post
you can use, materials are easily around us :
1. cut new pcb, same as ic outline.
2. using alumunium for sealed powder milk cans.
3. alumuniuium from building store.

using silicon seal or double tape for fixing shielding.
I really liked the idea of using copper clad board. Will use a double sided (both sides shorted) one.

Thanks and regards
Roushon.
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