op amp cost

[pikkujöpö]

Hi

How expensive are the op amps?

My SONY (cdp-312)CD player has two JRP 4556 op amps and I have found that one good replacement is AD 8610.

I would like to know from where I could get these op amps.
The reason why I'm asking the price is because my CD player is rather old and it may not make sense to spend too much money for tweaking it.

I like the sound of this CD player over my DVD,but few things are bothering me.There is less bass and sometimes the >S< sounds very irritating,overall I like the kind of "analogic" sound of this player.
One more question,do I need two single or two dual op amps?

[jackinnj]

Newark Electronics charges $9.00 for the AD8610.

[jmateus]

Hi

In fact the 4556 is an old opamp pratically obsolete by now.
It's a dual 741 (or similar) that doesn't rend justice to more
modern audio circuitry. Of course if you are to replace a dual
IC you must replace it with a compatible one that has at least the same physical configuration and electrical compatibility.

One good replacement opamp that you should consider is the
Burr Brown OPA2604 that has excelent distortion figure, low
noise and very high bandwith (20 Mhz) providing superior
performance in high end audio circuitry. Low noise FET input
and very high source impedance.
However I'm not sure if it is directly compatible with your 4556,
and that you have to check out.

The cost? Here in the States it costs $3.56 each, at Digi-Key,
http://www.digi-key.com.

Wheather you use this one or not, if you are to replace the
4556 you should replace by a high quality opamp, even the 5532
is better than that one even if you consider its age.
Good luck

[jmateus]

Hello again

Afinal eles são absolutamente compativeis fisicamente!
Yes they are compatible, pin by pin. However we are talking
about the 4556AD/AM/AV, 8 pin DIP Ic, not the 4556 AL which
is a 8 pin in line package.
There is a significant difference in price between the OPA and
the AD, $3.56 to $9.00.......

[anatech]

4556 is normally used to drive headphones and has a higher output current rating than most op amps. Like 70 mA into 250 R loads (from the JRC datasheet). In signal applications you would see things like 4558, 4559, 4560.

If this is a servo or headphone amp part I'd just leave it if I were you. PM me and I'll sent you the PDF file. It's about 170KB, to big to post.

-Chris

[pikkujöpö]

Big thanks for all the replys.

I must be loosing my sight,the op amp in my CD player is actually

4558
4482B
JRC

Not 4556 JRP like I stated.I'm embarrased

Does your advises aply to this op amp as well?

p.s. I'm sorry about this.

[jmateus]

Quáse a mesma coisa "se não há grão, levas feijão"...

As far as I´m concerned my post stands the same way for the
4558. As a matter of fact I was under the impression that you meant 4558 even though the 4556 is basicallly the same.
So my suggestion about the OPA2604 still stands.
There was one time that almost all the japanese companies
used the 4558 as "the" standard opamp for audio, including
Sony.
I own a CPD650 CD player (God bless it!) for a number of years
and this one is probably more recent than yours and being
so they used the 5532 almost exclusively.... and this one was
a Rolls Royce at the time.
Nowadays all these have been surperced and are almost obsolete.
Cheers

[anatech]

Hi pikkujöpö,
The 4558 has a slew rate of 1V/uS, pretty garden variety. Note that a "D" or "DD" suffex denotes quieter versions for audio use. It's a bipolar input device. Replace with a bipolar input part. NE5532 may work well here.

This is not an expensive op amp by any means.

-Chris

[anatech]

Hi jmateus,
Please read my reply above. JRC4556 is a different animal to most and I think they still use it. Not the same as JRC4558 at all. I can send you the datasheet if you wish. SR=3V/uS GBP=8Mhz. The load is 150R (wrong key on my first post - oops).

Also, NE5532 sounds good still and is really inexpensive. A good first try, then to your suggestion if there is a difference. Also note that the OPA2604 is a FET input device (may or may not matter) and that the higher bandwidth may cause it to oscillate without additional bypassing. Depends on the circuit and layout.

-Chris

[demogorgon]

I threw out the output opamps in my fisher the other day, i think they were the same thats in yours, and put in some opa2134, they are better than the 2604, and not much more expencive.

the sound is incomparable.
a new realm of fidelity. worth every penny.

marius