Replacing NJM2068 and NJM4580 by AD8620 or LM4562 - diyAudio
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Old 4th February 2014, 07:21 AM   #1
Roushon is offline Roushon  India
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Default Replacing NJM2068 and NJM4580 by AD8620 or LM4562

My problem is as in the title. Is the replacement suitable?
If yes, which one of AD8620 and LM4562 will be more
correct?

Edit. This is for my CD-player.

Regards
Roushon.
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Old 4th February 2014, 10:05 AM   #2
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I would stick with the NJM4580, low noise and exceptional quality.
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Old 6th February 2014, 02:12 PM   #3
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Quote:
Originally Posted by JonSnell Electronic View Post
I would stick with the NJM4580, low noise and exceptional quality.
Exceptional quality ?

Please download /read opamp_distortion.pdf here:

SG-Acoustics Samuel Groner IC OpAmps

Z
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Old 6th February 2014, 04:15 PM   #4
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Roushon View Post
My problem is as in the title. Is the replacement suitable?
If yes, which one of AD8620 and LM4562 will be more
correct?

Edit. This is for my CD-player.

Regards
Roushon.
Have a listen to the LM4562 here. The files are still available for now.
Listening Test Part 2. Active Circuitry.
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Old 26th February 2014, 02:12 PM   #5
gk7 is offline gk7
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Quote:
Originally Posted by zenelectro View Post
Exceptional quality ?

Please download /read opamp_distortion.pdf here:

SG-Acoustics Samuel Groner IC OpAmps

Z
Samuel tested the RC4580 which is marketed as a "drop in replacement" for
the NJM4580 but its _not_ the same chip.
The (original) NJM4580 is actually rather good and even used in ultra expensive
Accuphase products.
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Old 3rd March 2014, 05:49 PM   #6
GLooP is online now GLooP  Bulgaria
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You can replace NJM2068 by LM4562. NJM4580 requires more care, usually a high-current not-too-fast FET opamp is suitable. To utilize AD8620 requires some knowledge on the circuit. If it is well implemented, non prone to oscillation, with high input impedance and within supply specs, it should work well.
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