[sdiy] dual vco

[cheater cheater]

Would that be the PAIA Not-Really-Skinny-But-Fat-Reduced-Man?

:P
D.

On Thu, Apr 8, 2010 at 17:57, Scott Gravenhorst <music.maker at gte.net> wrote:
> Ian Smith <taciturn_unquiet at hotmail.com> wrote:
>>
>>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
>>
>
> Having had this problem with a FatMan "soft synch" - it's one thing to synch VCOs when one _wants_
> them to synch.  There are often times when one does not want synch, like for fattening a VCO sound,
> it's common to tune them very close together.  If they synch up, the fatness is lost.
>
>>
>>> 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
>>>
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>>>
>>> --
>>> Harry Bissell & Nora Abdullah 4eva
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>>
>>_________________________________________________________________
>>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
>
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>
> -- ScottG
> ________________________________________________________________________
> -- Scott Gravenhorst
> -- FPGA MIDI Synthesizer Information: home1.gte.net/res0658s/FPGA_synth/
> -- FatMan: home1.gte.net/res0658s/fatman/
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> -- When the going gets tough, the tough use the command line.
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