[sdiy] low supply voltage dual opamp ??? solved.. that's a well known problem

Jean-Pierre Desrochers jpdesroc at oricom.ca
Wed Sep 21 20:16:27 CEST 2016


I agree SOOOO MUCH !



Le 2016-09-21 14:12, Christian Tecl a écrit :

> Hi folks,
> 
> 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...
> 
> 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...
> 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...
> The only option you have is to look into old katalogs (if you know the 
> manufacturer or/and prod.
> date/timespan) or you go asking the right persons......
> 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.
> 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"
> 
> I know there are sites that deliver some of the things mentioned, 
> but... You all know...! It's fucked up!
> 
> So, sorry for the Off-Topic.
> 
> "This was straight down, while I searched that 690 / 055 ic you were 
> asking..."
> 
> Greetings
> 
> Christian T.
> --
> Diese Nachricht wurde von meinem Android Mobiltelefon mit GMX Mail 
> gesendet.
> Am 2016.09.21, 15:01, Jean-Pierre Desrochers <jpdesroc at oricom.ca> 
> schrieb:
> 
> Thanks to you all.. specially Paul..
> 
> The Microchip MCP6002 will effectively do the job here..
> 
> (But I still don't understand the "690 055" lettering on the original 
> 8SOIC chip... )
> 
> JP
> 
> ***************************************
> 
> Le 2016-09-21 07:39, Jean-Pierre Desrochers a écrit :
> 
> 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:synth1 at airmail.net]
> Envoyé : 20 septembre 2016 17:58
> À : 'Jean-Pierre Desrochers'; Synth-diy at synth-diy.org
> Objet : RE: [sdiy] low supply voltage dual opamp ???
> 
> OPA690. The 055 is the date code
> 
> Paul S.
> 
> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf 
> Of
> Jean-Pierre Desrochers
> Sent: Tuesday, September 20, 2016 4:55 PM
> To: Synth-diy at synth-diy.org
> 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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> --
> 
> « L'indépendance, c'est comme un pont :
> avant, personne n'en veut, après, tout le monde le prend. »
> Félix Leclerc
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-- 
« L'indépendance, c'est comme un pont :
avant, personne n'en veut, après, tout le monde le prend. »
Félix Leclerc



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