Interesting bit on the LM324, thanx for the responses.

TR

>From: < hardware@... >
>Reply-To: Doepfer_a100@yahoogroups.com
>To: < Doepfer_a100@yahoogroups.com >
>Subject: AW: 1 Re: A-101-2 Low Pass Gate and self oscilation
>Date: Mon, 10 Sep 2007 12:21:57 +0200
>
> > I cannot see any glaringly obvious circuit reason for using a higher-
> > spec op amp, and I guess Doepfer themselves are aware that A-100
> > stuff probably doesn't appeal to those people who absolutely insist
> > on low-noise *everything*, so my best guess would be that it simply
> > comes down to economics - I suspect the LM324 is just cheaper than a
> > TL074. I might be wrong though, and so I am willing to be corrected
> > by Dieter!
>
>The economic aspect is totally negligible (LM324 and TL074 are in the same
>price range below Euro .20). The fine adjustments of the vactrol modules
>(A-101-1/2/3) were made at that time by Roland Mayer and I found a note in
>his records that he had problem with HF oscillations if the TL074 was used.
>
>Best wishes
>Dieter Doepfer
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>

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