[sdiy] two VCOs on 1 PCB - problems

[Terry Shultz]

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
> 
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy