X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :content-type;
        bh=D+l40+YXzR0fgz3GkWsx/HPj7r6r0xIlHrMR5630qeA=;
        b=sH3m3u03i/5XH/dZaqA7LDtFl8kRWyJzasyLK3NDjwMJABKi/JhwxzHSOSotSdLktZ
         C5tBWarmOdJ5i41q9LwXQ6fN27ivYlBu0TZ95ReBbqdCRPRvORl0bgR5y+ORfE/vqt+O
         0XI9ReG40PllDuGpQsUYWt/uRwBQ+j3lkjVY7WK3QKXHv7/TzKBZcmky7fnWORO+vBFV
         RzXP1jaRclThIhohEEWMxwi8zFvg8+JUipRn3S+oQIDApz2ks+Wj6zXPz11x8csqw/xf
         xeBkUwHjzy1fJ+qZdTUA0qH30a5FpFB+9cT0XMOm3ydxx2MnJrHaOQHZj9uAHp1kwCh+
         IijA==
MIME-Version: 1.0
X-Received: by 10.112.209.4 with SMTP id mi4mr11249157lbc.7.1445606173888;
 Fri, 23 Oct 2015 06:16:13 -0700 (PDT)
In-Reply-To: <20151023070213.GA19358@visitor2.iram.es>
References: <CAM2RGhThg+5B6iGQ__Uh4=MxPeSVb9p1gS_9C+ik--E8AqS3GA AT mail DOT gmail DOT com>
	<CAOuGh89DAYWn49KnuqHO6NHcyB3GUoVsPD4n8FR=wcg8AY6wYw AT mail DOT gmail DOT com>
	<201510162117 DOT 12255 DOT ad252 AT freeelectron DOT net>
	<CAM2RGhSXgieJ+p5i_nQsAUMRQh1rp1PXHx_jB5p2XECY6jgjQQ AT mail DOT gmail DOT com>
	<20151023070213 DOT GA19358 AT visitor2 DOT iram DOT es>
Date: Fri, 23 Oct 2015 09:16:13 -0400
Message-ID: <CAM2RGhS4=PPXf1L5a_E9uABrLviY+L8n+0Opgi6_ZGnipi4grg@mail.gmail.com>
Subject: Re: [geda-user] The Chippocolypse is coming!
From: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: gEDA users mailing list <geda-user AT delorie DOT com>
Content-Type: text/plain; charset=UTF-8
Reply-To: geda-user AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: geda-user AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk

On Fri, Oct 23, 2015 at 3:02 AM, Gabriel Paubert (paubert AT iram DOT es)
[via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> On Thu, Oct 22, 2015 at 03:20:42PM -0400, Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
>> On Sat, Oct 17, 2015 at 1:17 AM, al davis (ad252 AT freeelectron DOT net)
>> [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
>> > On Monday 12 October 2015, Bob Paddock
>> > (graceindustries AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
>> >> Looks mostly like Audio and Audio Op-Amps, among some Line
>> >> Drivers and even a COP8micro (People really used those?)
>> >>
>> >> That Corp makes studio grade parts:
>> >>
>> >> http://www.thatcorp.com/
>> >
>> > "That" is great if "that" makes what you need, but it's all
>> > special stuff.  What happens when "that" is EOL?
>> >
>> > The big loss here is a high performance op-amp.  I use the
>> > LM4562 in some designs.  Can anyone recommend a truly comparable
>> > dual op-amp?  2.7 nv/rtHz noise, 45 mHz GBP, 20 v/us slew rate,
>> > drives 600 ohms.  I can find alternatives that might meet any
>> > one of those, but all???
>> >
>> > At least when the 4562 is no longer available, since it is an
>> > op-amp with standard pinout, something else will work with only
>> > a minor performance hit.  The "minor performance hit"
>> > alternatives are mostly cheaper.
>>
>> That is not too different from the LME49720 which *might* still be out
>> there in the TO-99 package. For some reason the TO-99 packaged
>> versions of the LME amplifiers are not being killed off.
>
> Surprising, since most manufacturers have obsoleted everything in TO-99
> package, with very few exceptions.

The funny part is that the LME49720 is really not so hot as a power
amplifier and despite what they say I would not use it to drive 600
ohm cables because it could self oscillate. It is however nice for
small signal stuff.

> For example, and as far as I can tell, Linear Technology has eliminated
> all TO-99 versions except the LTZ1000A, where the metal can is superior
> for reasons related to thermal insulation and mechanical stress on the die.

That is bizzar. I get that people hate paying for TO-99 stuff but a
reference really should be in that package. I have to wonder if they
are just switching people over to something newer that is available in
a TO-99. LT makes a few different references.

>     Gabriel



-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/