[sdiy] Welcome to the Twilight Zone

[Ken Stone]

Here's the clue :
>Thought I'd share a bit of bizarro behavior which occurred late last night.

____________________________________________________________^^^^^^^^^^^^^^^

I never do anything that late because by brain starts thinking things should
be the other way around to what they are, or are around the other way to
what they should be.

Either that, or you accidently shorted out an inverter in the input summer.
this thing is vero after all.

Ken

>When putzing around with the prototype Plan B (vector board) all of the
>knobs except the PWM and FM attenuator - the Freq, fine tune, even the two
>bipolar freq VC attenuators - suddenly operated in reverse.  Turning the
>freq pot CCW made the pitch higher.  Turning a freq VC attenuation pots
>fully CCW processed the VC fully positive (should be the other way around).
>
>Turned the power off - still there.  repeated that a few times - still
>there.  So then I put my VC Input through an external processor to invert in
>before it went to the VCO to see if I could fake the VCO out and when
>turning the offset knob on that processor in a  positive (more voltage)
>direction, I suddenly noticed that the controls returned the 'normal'
>operation on the VCO.
>
>They are all running off the same supply.  However, in the name of science
>and unparalleled universes, all of the effected controls do run through the
>same op amp internally (they are summed).
>
>Too weird and yes, I did check for flying donkeys outside and no, my cat did
>not begin to bark during this time.
>
>Now off sign to going I'm,
>
>
>- P
>
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>