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<p>Sometimes you can do a search online and find a marking number.
I've done this with SMT components that have codes rather than
part numbers. <br>
</p>
<p>It gets frustrating. The stuff gets so small they don't mark them
at all. If you drop an SMT cap you have to write it off because
they are not marked at all. And when SMT chips are marked they use
laser etching (I guess) that is very hard to read. Long gone are
the days of 1 watt resistors with big clear color bands. Now you
get little 1/8 watters and the colors are milky and you cannot
tell if its red or orange.</p>
<p>Then you get big company A buying out big company B and magically
all the really cool info in the datasheets get cut out, for
reasons I cannot fathom. I used to have a massive library of data
books. Then the internet came along and I got rid of most of them
because I could just look it up. But now a lot of that stuff is
gone. I still have a Linear Applications Handbook for that very
reason.<br>
</p>
--tr<br>
<br>
<div class="moz-cite-prefix">On 9/21/2016 11:12 AM, Christian Tecl
wrote:<br>
</div>
<blockquote
cite="mid:trinity-8023e314-d432-4a6d-876d-3106fb4ad132-1474481572426@msvc-mesg-gmx020"
type="cite">
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<div class="mail_android_message" style="line-height: 1; padding:
0.5em">Hi folks,<br>
<br>
that's a well known problem, these smd codes aren't as realiable
as they should be (or could be...) The reasons why are
countless... Main reasons are the manufac-date, copy right /
patent issues and the manufacturer themselves... <br>
<br>
The electronic component market is changing so fast, so few of
the former big players are manufacturing till today. And
surprise surprise, they are the ones where the codes are leading
you to the right components or their replacements...<br>
The company I work for is mainly doing service support for
industrial elect. devices. Nearly all of the employees are
highly experienced and educated pros, but the time that they and
we all spend, or say loose by searching for components, codes,
replacings.... It's just horroble...<br>
The only option you have is to look into old katalogs (if you
know the manufacturer or/and prod. <br>
date/timespan) or you go asking the right persons......<br>
Very preferable would be an overall database with a useful
amount of the old katalogs, an intelligent meta-search function
- connected to the common databases and some other goodies -
like a help forum with a reliable help valuation system...lot
more ideas hanging round here.<br>
It's been a while, since I play around with that idea, to do on
my own, but time is very limited 'till summer 2018... And
then... We'll see, you never know... "LIFE"<br>
<br>
I know there are sites that deliver some of the things
mentioned, but... You all know...! It's fucked up!<br>
<br>
So, sorry for the Off-Topic.<br>
<br>
"This was straight down, while I searched that 690 / 055 ic you
were asking..."<br>
<br>
Greetings <br>
<br>
Christian T.<br>
-- <br>
Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX
Mail gesendet.</div>
<div class="mail_android_quote" style="line-height: 1; padding:
0.3em">Am 2016.09.21, 15:01, Jean-Pierre Desrochers
<a class="moz-txt-link-rfc2396E" href="mailto:jpdesroc@oricom.ca"><jpdesroc@oricom.ca></a> schrieb:
<blockquote class="gmail_quote" style="margin: 0.8ex 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<p> Thanks to you all.. specially Paul.. </p>
<p> The Microchip MCP6002 will effectively do the job here.. </p>
<p> (But I still don't understand the "690 055" lettering on
the original 8SOIC chip... ) </p>
<p> JP </p>
<p> *************************************** </p>
<p> Le 2016-09-21 07:39, Jean-Pierre Desrochers a écrit : </p>
<blockquote style="padding-left: 5.0px;border-left:
rgb(16,16,255) 2.0px solid;margin-left: 5.0px;">
<pre>I'm back guys with my request..
Paul suggested it was an OPA690.
Well it looks it's not.
The OPA690 is a single opamp.
The one I need to replace is a dual opamp
(same pinout as the TL072.. not TL071).
Both outputs are on pins 1 and 7.
Supply pins are 4 and 8.
So I'm back where I was from start.
I need a dual opamp that:
- runs on 5vdc
- low power (powered with AAA battery 1.5v stepped up to 5vdc for all
circuit)
- 8SOIC package
Any idea the ship that would do ??
****************************************************************************
*
-----Message d'origine-----
De : Paul Schreiber [mailto:<a moz-do-not-send="true" href="mailto:synth1@airmail.net" target="_blank">synth1@airmail.net</a>]
Envoyé : 20 septembre 2016 17:58
À : 'Jean-Pierre Desrochers'; <a moz-do-not-send="true" href="mailto:synth-diy@dropmix.xs4all.nl" target="_blank">synth-diy@dropmix.xs4all.nl</a>
Objet : RE: [sdiy] low supply voltage dual opamp ???
OPA690. The 055 is the date code
Paul S.
-----Original Message-----
From: Synth-diy [mailto:<a moz-do-not-send="true" href="mailto:synth-diy-bounces@dropmix.xs4all.nl" target="_blank">synth-diy-bounces@dropmix.xs4all.nl</a>] On Behalf Of
Jean-Pierre Desrochers
Sent: Tuesday, September 20, 2016 4:55 PM
To: <a moz-do-not-send="true" href="mailto:synth-diy@dropmix.xs4all.nl" target="_blank">synth-diy@dropmix.xs4all.nl</a>
Subject: [sdiy] low supply voltage dual opamp ???
I need a low voltage dual opamp for a wireless microphone That runs with one
AAA battery. There is a step-up supply voltage circuit that rise the 1.5v to
5vdc to supply all the remote circuit including a dual opamp (single supply
used). This opamp needs to be changed.
All I can say about this opamp is that the case is a 8SOIC and the pinout is
the same as a TL072. The lettering on the case is :
690 followed by 055 (or D55 ???).
So I'm looking for a low supply voltage, low power and quiet dual opamp to
replace it.
Any idea ?
Thamks.
JP
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</blockquote>
<p> </p>
<div>
<pre>--
« L'indépendance, c'est comme un pont :
avant, personne n'en veut, après, tout le monde le prend. »
Félix Leclerc</pre>
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<br>
<pre class="moz-signature" cols="72">--
--Tim Ressel
Circuit Abbey
<a class="moz-txt-link-abbreviated" href="mailto:timr@circuitabbey.com">timr@circuitabbey.com</a></pre>
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