[sdiy] OP275 [was: Re: Audio mixers]

Tim Ressel madhun2001 at yahoo.com
Thu Jun 23 04:48:03 CEST 2011

I wonder what he thinks of the LM4562?


----- Original Message ----
From: "lanterma at ece.gatech.edu" <lanterma at ece.gatech.edu>
To: synth-diy at dropmix.xs4all.nl
Sent: Wed, June 22, 2011 5:59:26 PM
Subject: [sdiy] OP275 [was: Re:  Audio mixers]

Wow, he totally trashes the OP275:


"The Analog Devices OP275 is one of the few opamps specifically marketed as an 
audio device. Its most interesting characteristic is the Butler input stage; 
this combines bipolar and JFET devices. The idea is that the bipolars give 
accuracy and low noise, while the JFETs give speed and "the sound quality of 
JFETs". This final phrase is not a happy thing to see on a datasheet from a 
major manufacturer; the sound of JFETs (if any) would be the sound of high 
distortion. Let us however ignore this and see if the device actually works 
well. The datasheet includes a dissertation on "sound quality" which is not 
worth the ink expended in its last full stop. Expensive, and nothing special. 
Probably best avoided."

- Aaron
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