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cygnus x1 27th January 2013 02:41 PM

Best Audio IC
I have not kept up with audio ICs, as I'm a tube/vinyl aholic. Last time I did anything with an IC was to replace the I/V op amp in a Magnavox CD player( how many years ago???). Due to a major meltdown, I was forced to hook my CD player back up. I would like to change the IC, an AD712 (I did say years ago). Of course I should build a discreet design or put in a tube, but I just don't use it that much.
I'm also going to replace all the ICs in a parametic EQ, that has 4580s. So what is the best option for a dual op amp? I still prefer Analog Devices, but maybe somethings better? How good is a TI 4562?

lcsaszar 28th January 2013 08:58 AM

OPA2134 would be a good option. Best? :confused:

Mooly 28th January 2013 10:53 AM

I would generally go along with that recommendation too.

A couple of things to consider though. If the equaliser uses several 4580's then don't overlook the total current draw of the opamps. No problem with OPA2134 but consider 10 4580's drawing 6 ma each and 10 NE5532's drawing 15 ma each. If they were fed from 100ma regs... you see the problem.

Secondly, the 4580 has a higher than average maximum output current capacity. In other words it can drive low impedance loads and that might be a consideration in an equaliser when driving the C/R networks at max boost and cut. Probably not an issue in practice, just be aware.

How good is the (LM)4562. Very good indeed but it has only half the current drive ability of the 4580.

A less obvious choice could be the TLE2072.

cygnus x1 28th January 2013 05:32 PM

Anybody have a spare OPA2134 to try, before I order all the one's I need to mod the EQ (24 per ch). I could toss in into the CD player and give it a try.

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