[sdiy] Welcome to the Twilight Zone

[Peter Grenader]

Well...it just happened again.  I had the system off for a while, turned it
back on and bang.  Remember now, 'let me make myself perfectly clear' this
is the prototype we're talking about.



harrybissell wrote:

> we established (we think) you was in the parking lot...   :^P
> 
> I have to agree with Ken, even if you were not dreaming (one way
> or the other) late night is always a spooky (suspicious) time.
> 
> I do some of my worst work at night :^P
> 
> H^) harry
> 
> Peter Grenader wrote:
> 
>> Late had nothin; to do with this one...i wasn't dreamin!
>> 
>>> 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/>
>>> 
>