[sdiy] low input bias current opamps

[David G Dixon]

Yes, that one looks good, and is less than half the cost of OPA404.  I'm
tempted...

The thing about LF444 is that I bought a bunch of them from a local shop who
had bought them from Digikey, and none of them worked.  When I put them in
my ASR circuit, they drifted, like portamento, many mV per second.  I'm one
of those "once bitten, twice shy" sorta guys, so I'm very hesitant to buy
them again.

I should probably just buy a few from Digikey and assume that they'll be OK,
but if they aren't, I may actually burst into flames from rage.  So, that's
a risk.
 

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On 
> Behalf Of David Manley
> Sent: Wednesday, August 15, 2018 1:04 AM
> To: synth-diy at synth-diy.org
> Subject: Re: [sdiy] low input bias current opamps
> 
> On 8/14/18 8:43 PM, David G Dixon wrote:
> 
> > Hey Team,
> >
> > I'm looking for opamps with the following properties:
> >
> >
> > 7) Not LF444 (cuz they all seem to be defective)
> >
> > So, basically, I'm looking for a suitable alternative for LF444.
> >
> Hi Dave,
> 
> Just wondering if you could expand on #7?
> 
> This device has been around forever and is still in 
> production at TI, so perhaps it is something about the 
> application not the device?
> 
> You could also try this if you don't mind the cost:
> 
> http://www.analog.com/media/en/technical-documentation/data-sh
> eets/10578fd.pdf
> 
> -Dave
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