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Cgs synth

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Re: Analog Shift Reg (ASR) experience

2010-09-13 by sasami@hotkey.net.au

Thanks for the alert. I'd probably try LM3140 next, but get a few spare so
you can swap out any that have an offest. Fortunately, most of the ones I
have had have had the same offset, with only the occasional bad one.
I assume you are referring to Greencaps. I just used a version of the same
in a different physical package.

Ken

>I just finished my ASR and thought I'd share my experience.
>
>Turns out the National LF356's I used were probably bootleg. They
performed TERRIBLY. I temporarily replaced them with TL071's with OK
results - nothing fantastic, but at least they hold fairly well for a second
or so.
>
>I don't recall who I bought them from but the markings are:
>
>(National logo) JR69RB
>LF
>356N
>
>Be careful if you happen to have this part for ANY purpose.
>
>After troubleshooting that, I opted to replace the .047uf mylar film caps
with .22uf. You know, those green "Chicklet" gum looking things. Not the
best I know, but reasonable and cheap.
>
>I'll let you all know once I try either a different batch of 356's or some
3140's.
>
>Hope this helps someone else.
>
>Cheers,
>
>Doug
>
>
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

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