[sdiy] dual vco

[Ian Smith]

Is is necessarily a bad thing if the two VCOs are synced? I mean, if you're planning on syncing them (and personally I find it to be an interesting sound) wouldn't it be good to have this "built in" sync?

just my US$0.02

-Ian Smith


> I've tried to use two sections of the same chip in two different
> VCOs. They usually sync and it cannot be completely avioded, as they share
> "real estate" and especially power pins. Decoupling the power supplies
> is not effective in fixing the problem.
>
> Even the 4013 might be affected. There is a "CMOS Theremin" that uses
> 4093 gates as oscillators, they MUST be in different packages or they lock
> for sure (a fatal flaw in a theremin, na ?)
>
> H^) harry
>
> ----- Original Message -----
> From: Ian Fritz 
> To: Synth-diy at dropmix.xs4all.nl
> Sent: Thu, 8 Apr 2010 10:03:49 -0400 (EDT)
> Subject: [sdiy] dual vco
>
> Has anyone made a pair of VCOs using dual chips? I have one running using
> LM13700, TL072, CD4013, etc. The two oscillators sync up a bit, and I'm
> not sure if this intrinsic or due to still being on a whiteboard.
>
> Ian
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
> --
> Harry Bissell & Nora Abdullah 4eva
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
 		 	   		  
_________________________________________________________________
The New Busy think 9 to 5 is a cute idea. Combine multiple calendars with Hotmail. 
http://www.windowslive.com/campaign/thenewbusy?tile=multicalendar&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_5