[sdiy] Yusynth VCO

[cheater cheater]

BTW, Csaba (or anyone else who's got a Yusynth), do you happen to have
a dry recording of the oscillator at steady pitch? I wanted to have a
closer look in the wave editor. Think you would be able to set me up?
:-)

Cheers,
D.

On Sun, Apr 4, 2010 at 01:01, cheater cheater <cheater00 at gmail.com> wrote:
> Csaba,
>
>> Definitely worth building one or eight :) !
>
> Goes without saying :)
>
> Walker,
>
> On Sun, Apr 4, 2010 at 00:15, Walker Shurlds <walkershurlds at gmail.com> wrote:
>> Hey D,
>>
>> I see the same current mirror >> integrator >> comparator >> FET thing
>> as the actual oscillator that you see in the ASM-1's VCO, which is what
>> I'm working on understanding.  If I remember correctly that one is
>> inspired by the ENS-76.
>
> Really interesting! Thanks for that.
>
>> Compared to the ASM-1, the comparator is
>> set up differently: there's an extra diode and capacitor
>
> Can this be for tuning (trimming) the higher frequencies?
>
>> and it's
>> lacking a BJT connected to the base of the FET.
>
> Wonder what that could be..
>
>> Also the integrator is weird, uses the virtual 5V from the opamp in the
>> upper left instead of using a virtual ground from somewhere.  Because
>> of this (I'm guessing), it lacks an inverter that the ASM-1 has before
>> the waveshaping.
>>
>> It's looks interesting for sure.  I sense there's a bunch in there more
>> I can learn from it.
>
> Judging from the demos, it's one of the few really ph4t VCO designs
> I've heard in a long time, and the only one I know of that can be made
> new with available schematics! (the other one is the M5, but I don't
> see any schematics anywhere let alone nice board layouts like on
> yusynth..)
>
> Cheers
> D.
>
>
>> On Sat, 3 Apr 2010 23:15:04 +0200
>> cheater cheater <cheater00 at gmail.com> wrote:
>>
>>> Cool.. any idea what other (more classic?) VCO design they are based
>>> on or the closest to?
>>>
>>> I think I noticed your name mentioned on the Yusynth page :-)
>>> How much did the cost work out to for you?
>>>
>>> BTW, here's the page with board/schematics for anyone who's
>>> interested: http://yusynth.net/Modular/EN/VCO/index.html
>>> and some (sadly mp3) demos of a modular based on yusynth modules. They
>>> sound real nice:
>>> http://www.rainbow-serpent.de/index.php?page=modular
>>>
>>> Cheers
>>> D.
>>>
>>> On Sat, Apr 3, 2010 at 22:44, Csaba Zvekan <czvekan at gmail.com> wrote:
>>> > Yes, I have built six of them . Even with hand matched transistors
>>> > just to try them out. They work wonderful . A truly great design.
>>> >
>>> > Csaba
>>> > On Apr 3, 2010, at 9:05 PM, cheater cheater wrote:
>>> >
>>> >> Hi guys,
>>> >> I was wondering if anyone here has used/built the Yusynth VCO. Any
>>> >> thoughts about it?
>>> >>
>>> >> Anyone know what design it is based on? I'm still nowhere near good
>>> >> enough to read the schematics on that thing :-)
>>> >>
>>> >> Thanks
>>> >> D.
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>