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Old 28th March 2011, 08:30 AM   #1
branet is offline branet  Croatia
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Default discrete opamp class A

I'd like to replace the chips in my cd player.
Now there are three ne5534 I would like too replaced them with discrete opamp working in class A.
Something like burson discrit opamps.
If anyone has some suggestion?
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Old 28th March 2011, 09:06 AM   #2
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Yeah, my suggestion is check out Samuel Groner's extensive measurements on opamps first. Burson discrete doesn't fare very well at all and he says it looks identical to Audio-gd OPA-Earth which is much cheaper.

SG-Acoustics Samuel Groner IC OpAmps
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Old 28th March 2011, 10:20 AM   #3
AndrewT is online now AndrewT  Scotland
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there are a number of discrete opamps in this Forum.
I think Peranders has a board for one as well.
Mox thread had one but it required two pcbs for a dual.
Maybe Juma has one.
Pass shows some.

Search, you should get quite a few hits.
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Last edited by AndrewT; 28th March 2011 at 10:38 AM.
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Old 28th March 2011, 03:27 PM   #4
branet is offline branet  Croatia
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There are many schemes but little with the PCB layout and that is also wath I need!
And class A it would be nice!
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Old 28th March 2011, 06:03 PM   #5
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Quote:
Originally Posted by branet View Post
I'd like to replace the chips in my cd player.
Now there are three ne5534 I would like too replaced them with discrete opamp working in class A.
Something like burson discrit opamps.
If anyone has some suggestion?
Quote:
Originally Posted by branet View Post
There are many schemes but little with the PCB layout and that is also wath I need!
And class A it would be nice!
All stages of Op-Amp runs in general in pure class A, except such versions suited for power amplifier applications like TDA2030 etc. By such versions the last stage (power buffer) runs with only 10-100mA idle current.
Here several URLs about OP-AMPs include several about discrete versions
AD797 discrete clone - comparison of seven variations
AD797 Clone people! Who can make a better one.
Discrete AD797 up and running
AD797 now sounds like it should - Head-Fi.org Community
AD797 discrete clone - comparison of seven variations - diyAudio
Doug Selfs NE5532 Power Amp. Thoughts anyone ! (post #4 paralleling NE5532)
Pass Discrete Opamp in DIP-8 Package
Anyone have made those diy discretes op-amps ?
My take on a **buildable** Discrete Op-Amp...
Simple 60dB discrete low noise amplifier (lna)
ADA 4627 (ADA4627-1) outperform Burr Brown's OPA 627 (OPA627)
LME49990 Audio Op-Amp - better than AD797?
5534 audio amp (Replacement for NJM4580)
What is wrong with op-amps?
JRC5534 replacement for IV section ???
replacement for TBA231 help req
Where are intern. schematic of LME49710 LME49720 and LM4562 (LM 4562 LME 49710 49720)
http://www.diyaudio.com/forums/music...ent-tl07x.html
Linear Tech. LT1166 chip
Thick Film Hybrid (not monolithic) Integrated Circuit Amplifier - Overview
Apex Precision Power SA01 - useful also for Audio?
INA217 Preamp

Last edited by tiefbassuebertr; 28th March 2011 at 06:07 PM.
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Old 28th March 2011, 06:33 PM   #6
poynton is offline poynton  United Kingdom
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Try this from Ray (of the HUGE CD63/67 mod thread) :-

Discrete output stage


PCB is available, too.



Andy


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Old 28th March 2011, 06:58 PM   #7
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by tiefbassuebertr View Post
All stages of Op-Amp runs in general in pure class A, except such versions suited for power amplifier applications like TDA2030 etc.
where did you get this from?
Or did you invent that hypothesis yourself?
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Old 29th March 2011, 07:04 AM   #8
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by branet View Post
I'd like to replace the chips in my cd player.
Now there are three ne5534 I would like too replaced them with discrete opamp working in class A.
Something like burson discrit opamps.
If anyone has some suggestion?
Three 5534's is an odd (as in not even) number ? so they can not be just audio left and right channels. Are you sure they are all 5534 ?

Do you know what they all do before replacing them.

As to replacing 5534's in the audio path such as buffers/filters or I/V conversion I would recommend the OPA604 from my own experience providing they are suitable.
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Old 29th March 2011, 09:52 AM   #9
branet is offline branet  Croatia
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Quote:
Originally Posted by Mooly View Post
Three 5534's is an odd (as in not even) number ? so they can not be just audio left and right channels. Are you sure they are all 5534 ?

Do you know what they all do before replacing them.

As to replacing 5534's in the audio path such as buffers/filters or I/V conversion I would recommend the OPA604 from my own experience providing they are suitable.
You have the right chips are 5532.
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Old 30th March 2011, 10:14 AM   #10
Mooly is online now Mooly  United Kingdom
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Try the OPA2604 for 5532's. Should be no problems as a direct swap.
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