[sdiy] op amp based filter

[Roy J. Tellason, Sr.]

On Saturday 24 July 2010 01:35:58 pm cheater cheater wrote:
> Ah, I just mentioned 101 since it's the one Wikipedia mentions in the
> op amp article. I do realize that 201/301 are similar, they all share
> the same datasheet. But yeah, it was just an example. But I wasn't
> able to find the 201 or 301 anywhere for 'normal' money either.

Are you looking for multiple letter prefixes?  LM301, uA301,  etc.?  I can't recall offhand what else it might be under,  but that's a pretty common and generic part...

> Well,  4 usd isn't that bad, but if you can get something similar for sub-1
> usd and with good shipping costs..
> 
> Cheers,
> D.
> 
> On Sat, Jul 24, 2010 at 19:02, Roy J. Tellason, Sr.
> <rtellason at verizon.net> wrote:
> > On Saturday 24 July 2010 12:08:21 pm cheater cheater wrote:
> >> On the other hand, maybe an op amp with an external capacitor could
> >> work? I understand LM101 is one such design but I was unable to find a
> >> place to buy them *cheap*. National has them at around $4, that
> >> doesn't look encouraging, but maybe someone owns a huge heap of NOS.
> >> As a bonus you can have them in metal can format.
> >
> > Do you understand that the "101" part is military temperature range?  The 201 and 301 are much more common,  the 301 particularly,  and probably a whole lot easier to find,  not to mention cheaper...

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