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Old 5th September 2007, 04:10 AM   #21
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Hey,

I concur. NJM4580 and NJM4556 are both pretty darn good. You know 4556 is used for Grado RA-1?

Originally, I wanted 4556, but I could not buy these in Tokyo. They are supplied through some odd supplier chain. So I could only get 4580. Eventually, I had to pull some favors to get 4556. (you know shady
booths with smoking old lady?)

Recently I upgraded my old headphone amp and plz look at the pic:

Click the image to open in full size.

This is utterly funny. Using EVM for a headphone amp. (and you know it's a type of CMOY amp.

Tomo
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Old 5th September 2007, 04:31 AM   #22
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Tomo : Did you compare the NJM 4580 and 4556 ?
Any audible differences ? Is it used as a line stage or headphone amp ? If a headphone amp , what headphone did you use.

The Juli@ sound card also uses the NJM4580 V ( the smallest package ). I was trying to get some of those to replace some faulty ones.

Cheers.
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Old 5th September 2007, 12:08 PM   #23
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Hey,

I was using those to drive my 32 ohms headphones as the output stage of an experimental YAHA amp. Initially I was using 4580 but later tried out 4556. But these guys are good in "coloured" way. So I think you should not use it for line-stage.

I would go with something like AD797 or something. After all, upgrading to "cheap" opamps doesn't sound like "Upgrading" at all.

Quote:
NJM4580 and NJM4556 are both pretty darn good.
With this I meant, they are good "for the price". This doesn't mean they can out-do OPA627 or AD8610. Sorry for the confusion.

But I do own handful of these for "experimentation".

Tomo
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Old 7th September 2007, 07:43 PM   #24
PMA is offline PMA  Europe
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The output stage is the weak point of your circuit.
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Old 7th September 2007, 07:45 PM   #25
kubeek is offline kubeek  Czech Republic
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That was helpful. In what way and why is it weak?
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Old 9th September 2007, 02:23 AM   #26
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Hey,

I think he means this:

http://www.tnt-audio.com/clinica/dynamicopamp_e.html

Usually opamps are designed to drive fairly high impedance. So it isn't good to directly drive headphone via opamp. Which is why I thought it was good to use a cable driver (which wasn't the best idea ... as all the trouble it caused me. ... Fun as an electronics student.)

Hey, one more thing. There was some rumor about cheap driver called TDA1308. Sijosae (spell?) wrote something in Korean, but I failed to understand the document. How about it?

Tomo
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Old 12th September 2007, 06:24 AM   #27
sangram is offline sangram  India
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^^ Not bad, actually. It is used as the output for the front speakers on my SB Live! The sound is pretty much mauled by the resampling and the cheap little CS4297 DAC before it, but i seems quite capable and the spec sheets aren't too bad either, better than lots of opamps. I seem to prefer the LM4562 and Philips DAC combo on the rear speakers though.
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Old 12th September 2007, 09:05 AM   #28
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Two LM1875, with 51R resistors in series with the output. Using this IC with + / - 15 or 25v, you'll get some SERIOUS power, and you can explode any headphone. And more, it's sound quaility is very good !
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Old 16th September 2007, 05:47 AM   #29
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Hey,

Going back to,

Quote:
So what do you think about this? Transistors will probably be 2n5551/5401 and MJE340/350, with NE5534 as opamp.
I am curious as well. There are many designs, but some reliable people go with simple opamp and transistor pushpull. Are those good? I mean does it worth it to go really far by using more sophisticated topology?

There is also a design like Sheldon Stoke's amp where the usual AB-output stage is pulled to class A and lower transistor becomes a current source.

Personally, I was thinking about use CHEAPO transistors like 2N3906/4. 200mA right? Isn't it enough?

Tomo
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Old 16th September 2007, 06:37 AM   #30
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".............Going back to,
quote:
So what do you think about this? Transistors will probably be 2n5551/5401 and MJE340/350, with NE5534 as opamp.

I am curious as well. There are many designs, but some reliable people go with simple opamp and transistor pushpull. Are those good? I mean does it worth it to go really far by using more sophisticated topology?............."



Yes , try the simple topology and you will not be disappointed.
Stop searching around for more. By now you should have had a functional unit up and working.
I have some spare h/p amp pcb's . If you want one I can send it to you . It uses BD139/140 for the output and works off +/- 12 volts . +/- 9 volts also possible.

Cheers,
Ashok.
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