[sdiy-interim] sensible trigger

[Gorka Garcia]

I have built a soundlab minisynth

http://www.musicfromouterspace.com/analogsynth/SOUNDLABMINISYNTH/soundlab.html

and the area in the PCB around the "external gate in" circuit seems to be very sensible to proximity:

http://www.musicfromouterspace.com/analogsynth/SOUNDLABMINISYNTH/synthkit_argen_001.gif

Moving my finger near (not even touching) that part of the circuit seems to trigger the AR generator. Can anyone explain what is happening, why and how to fix it? I think the ground is a bit noisy (I had problems in the past with my white noise having some Low frequency noise), maybe it is related... 

Thanks and best regards,

Gorka


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