From ROBERTS@pharm.som.sunysb.edu Wed Sep 13 13:41:41 1995 Received: from informatics.sunysb.edu by taz.hyperreal.com (8.6.12/8.6.5) with SMTP id NAA13719; Wed, 13 Sep 1995 13:41:38 -0700 Received: from pharm1.pharm.sunysb.edu by salieri.informatics.sunysb.edu with SMTP (931110.SGI/25-eef) id AA11035; Wed, 13 Sep 95 16:41:36 -0400 Received: from PHARM1/SpoolDir by pharm1.pharm.sunysb.edu (Mercury 1.21); 13 Sep 95 16:41:35 +0500 Received: from SpoolDir by PHARM1 (Mercury 1.21); 13 Sep 95 16:41:09 +0500 From: "Roy Roberts" Organization: Pharmacology, SUNY Stony Brook To: roy@hyperreal.com Date: Wed, 13 Sep 1995 16:41:06 EST Subject: (Fwd) Re: OP-Amps Priority: normal X-Mailer: Pegasus Mail/Windows (v1.22) Message-Id: <567AE7E1345@pharm1.pharm.sunysb.edu> Status: OR ------- Forwarded Message Follows ------- Date: Fri, 1 Sep 1995 04:57:04 -0700 From: vance@netcom.com (Vance Gloster) To: jocke@netcontrol.fi Cc: mr808@teleport.com, Christopher_List@sonymusic.com, analogue@hyperreal.com Subject: Re: OP-Amps Here are some noise figures (in nV/SQR(Hz) at 1kHz): 1458 45 TL072 18 LF412 18 4558 8 5532 5 [Source: Texas Instruments Op-amps and Comparators Data Book 1995] I'd trust the guys at Waldorf and go for 4558s. Besides, those JFET-input op-amps (TL-, LF-) have a tendency to self-oscillate in some circuit configurations, which bipolars don't. PAiA uses the 5532s in their TubeHead, and they are remarkably quiet. I was very impressed with the unit. Thanks for the figures, Joachim! -Vance Gloster vance@netcom.com