[sdiy] Expo in one chip?
David G Dixon
dixon at mail.ubc.ca
Wed Dec 27 00:33:18 CET 2017
Thanks for that, Neil. I'm finding it very hard to find any info on the web
about these chips other than the stub of a datasheet on their website. I
guess you have inside information. That self-destruction thing is a huge
The other day I plugged a thing I had built with 3 2164 chips up backwards
(expo power with the stripe on the wrong side) and, miracle of miracles, the
2164 chips survived. I guess it is really when one of the rails (or ground)
is not connected that it fries, not when they are connected backwards.
> -----Original Message-----
> From: Neil Johnson [mailto:neil.johnson71 at gmail.com]
> Sent: Tuesday, December 26, 2017 2:30 PM
> To: David G Dixon
> Cc: SynthCube; Jacob Watters; SDIY
> Subject: Re: [sdiy] Expo in one chip?
> > Can you tell us briefly what these "welcome changes" are?
> I, for one,
> > was hoping that they'd put the stupid stability networks on
> the chip,
> > saving a pile of 560pF caps and 510R resistors.
> For one thing, if they did manage to put four 560p caps on
> the die then you wouldn't be able to afford it - the die area
> would be so large the simple cost plus reduction in yield
> would push the price way up, far more than the savings of
> external components. So, no, you still need external
> compensation networks on each input.
> Main improvements are: lower noise, lower distortion, higher
> control pin resistance, and DRUM-ROLL .... they fixed the
> missing-rail self-destruction mechanism. YAY!!!!! It sure
> was nice to pull the -ve supply and watch the +ve current
> draw creep up just a little, and no smoke :)
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