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Old 8th January 2003, 10:24 PM   #11
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Default Connection Diagram

Hi Snake...


The pin function of the NJR5532 of 9 pins are


1--V+ (internaly conectd to 9)

2--A output

3--A - input

4--A + input

5--V -

6--B + input

7--B - input

8--B output

9--V+ (conct. to 1)

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Jorge Santos
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Old 8th January 2003, 11:07 PM   #12
Wombat is offline Wombat  Germany
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@ m60gpmg

Here we go again!

As you can see none of us can give a unique advice

But for sure it depends on the design your CD-Player delivers
and how therefore an OP amp behaves in there.

All i can advice you is to make some tests on your own.

This NEC4570c is relative slow against the so called good ones. I bet
there will be a better one for you.

You have only one IC to swap, so it won´t hurt to buy 3 or 4 OPs and an
IC-Socket to start your own tests.

I would recommend to buy a cheap NE5532, a philips one when its possible.
One from the Brownies OPA2604 or OPA2134.
An OP275, one of the circuits many like a lot.
And finally a really fast settling one like the AD826 or LM6172.

None of them is bad sounding. There can only be some problems with the really
fast ones due to the board layout, like flickering in the TV next to it

With this selection you can find one that fits and if you like it you can
enter the never ending story even more.

This way i found my favourites.
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Old 9th January 2003, 08:25 AM   #13
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Default thanks to everybody

Quote:
With this selection you can find one that fits and if you like it you can enter the never ending story even more.

This way i found my favourites.
thanks of the suggestion I will do as you say
Thanks to everybody!

Best regards,
m60gpmg
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Old 17th April 2003, 01:22 PM   #14
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Finally I found a datasheet of C4570. Maybe it is useful for people that want to replace C4570 for something good:

http://www.ee.nec.de/_pdf/G10528EJ6V0DS00.PDF
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Old 17th April 2003, 01:58 PM   #15
fedde is offline fedde  Netherlands
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Quote:
Originally posted by jean-paul
Finally I found a datasheet of C4570.
You should have asked me...

Fedde
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Old 17th April 2003, 04:03 PM   #16
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Hi Fedde, it was Per-Anders that asked for it.

I still dream of a free datasheet-database on the web. Makes life easier for all of us when the companies delete theirs when you need them.
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Old 17th April 2003, 04:13 PM   #17
fedde is offline fedde  Netherlands
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You mean something like:
http://www.chipdocs.com



(thanks to Google...)

Fedde
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Old 17th April 2003, 04:14 PM   #18
fedde is offline fedde  Netherlands
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whoops, sorry not free... :-(

There is a free one though, I'll try to find the link again...

Fedde
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Old 18th April 2003, 07:42 AM   #19
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Default Cobra2

I did the same modification in Luxman CD
I changed it for one OPA2134 the change was better, only carefull becouse is neccesary that you respected the pin out,
also you need to make a little PCB to adapter the differents package outline,so
you can see an example in the www.lcaudio.com,
I have the datashett NJM5532 and I´ll sent you in PDF format at your email.

Jesús Puerto
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Old 28th April 2004, 05:55 AM   #20
Fin is offline Fin
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Default Replacing opamps

Hi all

My CDP has a NJM5532 opamp in the output stage. I am interested in changing this for something better.

I know that opamps like OPA2134 and OPA2604 are drop in replacements physically, however, are any changes to the circuit/surrounding components required or advised?

I am also interested in Sparhawk's comments about replacing a dual opamp with two single opamps.

Are the Brown Dog adaptors used for this any good?
Do they introduce additional problems by moving the opamps further away from the PCB/groundplane?
Is there another/better way to do this?
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