[sdiy] two VCOs on 1 PCB - problems

[neil harper]

hi terry,
the schematic for the vco-1 can be found here:
http://www.birthofasynth.com/Thomas_Henry/Pages/VCO-1.html

i don't have anything i can send you with my protoboard layout, i just
basically copied my breadboard layout. 


On Thu, 2012-12-27 at 13:26 -0800, Terry Shultz wrote:
> Hi Neil,
> 
> Do you have a schematic  we can review and a PCB or protoboard layout?
> 
> It sounds like some parasitic clocking may be the issue but that is based upon a rough guess.
> 
> best regards,
> 
> Terry Shultz
> DSP and ARM Audio Technology
> thx1138 at earthlink.net
> On Dec 27, 2012, at 1:04 PM, neil harper <metadata at gmx.com> wrote:
> 
> > hi everyone,
> > seasons greetings from canada
> > 
> > as my christmas project, i built two Thomas Henry VCO-1's on a single
> > protoboard. so far everything seems like it's working and sounds great,
> > but I am noticing a few "quirks".
> > 
> > - as the tuning of each oscillator gets very close, they seem to lock
> > together.
> > 
> > - when the oscillators are tuned close, i believe i'm hearing one of the
> > oscillators reset (sounds like an occasional 'tick' maybe once every
> > second - goes away when i detune the other oscillator).
> > 
> > i only have experience doing circuit boards for small digital stuff, so
> > i know this is a bit over my head as a first synth project. :) i'd like
> > to make this on a proper PCB for myself, so does anybody have any tricks
> > i can do on the PCB layout to eliminate these problems? 
> > 
> > 
> > 
> > -- 
> > //neil harper
> > 
> > 
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> 

-- 
//neil harper