[sdiy] 2164 Expo VCO tracking

[David G. Dixon]

> Keep in mind that the IC manufactures fabricate in large quantities and
> test
> the product to meet the minimum specs and sometimes sell better ones at a
> premium price, you may have some "Golden" chips that far exceed the
> minimum
> guaranteed specs. If you socket the IC in your board you could hand test
> and
> grade out the chips and possibly get extended range tracking, your
> breadboard setup may have had one of the "Golden" chips.

No, it was the same chip on breadboard and PCB.

While there is definitely some variability in the V2164 (which may simply be
a de-leaded and repackaged SSM2164, although I'm not entirely sure), there
are no "premium" chips on offer from Coolaudio.