[sdiy] 4069 vco gives ground noise?

[Karl Ekdahl]

Hello everyone, i've built René Schmitz 4069 vco and
stand alone it's working perfectly. But while adding a
few modules to the same powersupply the ground line
starts "wobbling". 

Through my limited electronics knowledge i've
recognized that if i put a 100k resistor inbetween
ground and gnd pin on the 4069 i can reduce the noise
but then the square out stops functioning. 

Does anyone have any idea on why there's ground noise
and how to prevent it?

thanks

/Karl

_____________________________________________________
Gå före i kön och få din sajt värderad på nolltid med Yahoo! Express
Se mer på: http://se.docs.yahoo.com/info/express/help/index.html