Xref: utzoo rec.audio:8273 sci.electronics:3817
Path: utzoo!attcan!uunet!husc6!mailrus!ames!vsi1!altnet!altos86!ti
From: ti@altos86.UUCP (Ti Kan)
Newsgroups: rec.audio,sci.electronics
Subject: Re: Choosing Op-Amps
Message-ID: <522@altos86.UUCP>
Date: 15 Sep 88 16:05:49 GMT
References: <1152@ucsd.EDU>
Reply-To: ti@altos86.UUCP (Ti Kan)
Organization: Altos Computer Systems, San Jose, CA
Lines: 26

In article <1152@ucsd.EDU> brian@ucsd.EDU (Brian Kantor) writes:
>As part of my design for a really wonderous hi-fi preamp, I've been
>trying to choose the right op-amps to use - or indeed, to discover

... deleted description of LM540, MC1556s for RIAA phono stage,
tone control and flat gain stage...

Yes, now there are some much better op-amps for audio preamp applications.
If low noise is prime concern, the Signetics NE5534A is the best.  It
combines superlative noise specs with high slew-rate (13V/uS), and low
cost.  For lower noise yet, Precision Monolithics' OP27 has less noise
than the NE5534, but the slew rate is much worse (0.5V/uS).  For superb
slew rate (but not necessarily low noise), the National LM318 has a slew
rate spec of 70V/uS.  There is also a NE5532A that is a dual NE5534 with
internal compensation.  Signetics also has a new NE5535 that is also
suitable for audio applications.

For the most up to date information on these things, and articles of
audio projects, I recommend the "Audio Amateur" magazine (not available
from bookstands: Subscription only).

-- 
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
Ti Kan, Altos Computer Systems
UUCP: ...ucbvax!decwrl!sun!aeras!elxsi!altos86!ti
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-