[sdiy] 8038 XR2206

[dj hohum]

On 7/11/07, John Mahoney <jmahoney at gate.net> wrote:
> At 11:44 PM 7/11/2007, dj hohum wrote:
>
> >Rummaging through my junkbox I was sure I had a 566 or two. Well, I
> >have 555, 556,565, and 567, but no 566. My memory is telling me this
> >isn't the first time that this has happened.
>
> People mix up the 556 (dual 555) and the rare 566 all the time.

Yeah,well at some point in time (like in the past 20 years), I had at
least one or two 566 chips. But, I think that they're long gone and I
just keep relooking for them thinking that I saw them someplace.

> >But, I do have a pair of 8038s, one with a 1.79 price tag from the
> >shack!, and a pair of XR-2206s. Looking at the schematics for the
> >thomas henry VCO here:
> >
> >http://electro-music.com/forum/phpbb-files/schem2_161.jpg
> >
> >It seems that there's no positive power connection? Is this correct?
>
> Yes! The chip runs in reverse. ;-)  Seriously, the power connections
> are Ground and V- instead of V+ and Ground. Thomas credits this
> discovery to John Simonton (originally with the 566, I think).

So are the outputs centered across zero? Or, are they negative going?

tnx,
Daryl