<html><head/><body><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<meta name="viewport" content="width=device-width" /><meta http-equiv="Content-Type" content="text/html;charset=utf-8" /></head><body style="font-size: 10.0pt;font-family: Verdana , Geneva , sans-serif;"><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 <jpdesroc@oricom.ca> schrieb:<blockquote class="gmail_quote" style="margin: 0.8ex 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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Thanks to you all.. specially Paul..
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The Microchip MCP6002 will effectively do the job here..
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(But I still don't understand the "690 055" lettering on the original 8SOIC chip... )
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JP
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***************************************
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Le 2016-09-21 07:39, Jean-Pierre Desrochers a écrit :
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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 href="mailto:synth1@airmail.net" target="_blank">synth1@airmail.net</a>]
Envoyé : 20 septembre 2016 17:58
À : 'Jean-Pierre Desrochers'; <a 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 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 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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<pre>
-- <br />
« 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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