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Old 6th May 2007, 01:54 AM   #21
SimontY is offline SimontY  United Kingdom
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Default Re: OPA2604 is really a good OP

Quote:
Originally posted by bbp


The OPA2604AP ,which can work at +/-24V sound pretty good!

I've not tried it in my preamp but the 2604 sounds terrible in the CD63. Very unnatural, false and harsh sound. Worth a try if you have one handy though.

Simon
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Old 6th May 2007, 12:29 PM   #22
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Right now I've no OPA2604 to try, maybe my next sample
I've the LM4562 wich works nice and better than NE5532. I don't know if I still need to do the mods you said for regs PPA?
Maybe later I'll go for s-regs anyway.
Here is the LM on the tulip socket.
Click the image to open in full size.
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Old 6th May 2007, 01:18 PM   #23
bbp is offline bbp  China
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Default Oh,the OP is used in the PSU..

Quote:
Originally posted by Malefoda
Right now I've no OPA2604 to try, maybe my next sample
I've the LM4562 wich works nice and better than NE5532. I don't know if I still need to do the mods you said for regs PPA?
Maybe later I'll go for s-regs anyway.
Here is the LM on the tulip socket.
Click the image to open in full size.
I know this since your picture.
As the OP is not used in PSU, you needn't use high quality OPs in it. NE5532 is good enough.
This is the circuit.
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Old 6th May 2007, 02:48 PM   #24
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Can you explain? I understand nothing
OP not used? Anywhere to improve then?
Thanks!
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Old 6th May 2007, 03:18 PM   #25
ppa is offline ppa  Italy
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you could put a 2.2k resistor between the 7815 out and the ground and also an other 2.2k resistor between the 7915 out and the ground. This is a fast upgrade that reduces the regulators distortion because the regulator's output stage currents polarization is greater.
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Old 6th May 2007, 03:26 PM   #26
ppa is offline ppa  Italy
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often the IC op amps have a small quiescent currents (power supply currents) and so the regolators work with a few mA but increasing this current the regolators work from class A to class AA and so the sound is often more kindly than when they work without the resistances.
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Old 6th May 2007, 04:58 PM   #27
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Ok, here I go for some 2.2k res. This time I understand
But still, why "As the OP is not used in PSU, you needn't use high quality OPs in it. NE5532 is good enough" ?
Is the LM4562 a waste or even a problem? It's from sample program, I've many in hand.
Can you explain please?
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Old 7th May 2007, 03:11 AM   #28
bbp is offline bbp  China
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Default Ah...I made a mistake

Quote:
Originally posted by Malefoda
Ok, here I go for some 2.2k res. This time I understand
But still, why "As the OP is not used in PSU, you needn't use high quality OPs in it. NE5532 is good enough" ?
Is the LM4562 a waste or even a problem? It's from sample program, I've many in hand.
Can you explain please?

"As the OP is not used in PSU, ..." is wrong,


Correct it as "As the OP is used in PSU,...."

The OP is used in the PSU in oder to reduce the high frequency noise,so that the PSU is more clear and pure. But the OP is not used in the Audio siganl path, I think the NE5532 is good enough.

regards

bbp
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Old 7th May 2007, 06:31 AM   #29
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Really? So what is making the audio amplification?
So super regs are more than welcome here
So here the best is opamp with good rejection ratio?
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Old 7th May 2007, 11:43 AM   #30
SimontY is offline SimontY  United Kingdom
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Quote:
Originally posted by Malefoda
Really? So what is making the audio amplification?
So super regs are more than welcome here
So here the best is opamp with good rejection ratio?
If you changed it and it sounds good then leave it!
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