[sdiy] RE: What is Ref?

[Dan Snazelle]

on the toy synth vco, what voltage should go into REF??? 3volts? 1.5 volts? 

looks cool!! i want to build these but have always been afraid of the REF. 

if you can just tell me what amount of voltage to put in there, i can buy a voltage reference right/

thanks
--------------------------------------------
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> Date: Fri, 6 Jun 2008 23:23:34 +0900
> From: takeda at aleph.co.jp
> To: subjectivity at hotmail.com; synth-diy at dropmix.xs4all.nl
> Subject: What is Ref?
>
> Hi, Dan and Lists
>
>> ...I always check it for stuff.
>
> Wow, I'm so glad to hear that.
>
> REF means the voltage separately made to use it for somewhere sensitive
> to the change of the voltage.
> In VCO, sometimes we want to use accurate voltage for tune knobs or
> octarve switches or so.
> But it's only a side of my intention. There is another side.
> Yes, we are always making voltage for bias for TR's, for examples. but,
> one TR needs voltage and other one needs another.
>
> Ref is fixed voltage. We have +15V and grand or so. And Ref should be
> another roots of schem. if you want to use Ref then use it as is.
> If you change the ref then total action of scheme should be changes totaly.
> That the goal I intended , but it's not easy to do that.
>
> http://www.aleph.co.jp/~takeda/radio/parm/work/ToySynth-Schem.gif
>
> this is 1VCO with SAW and SQR, Decay only EG and VCA. it's no VCF synth
> for wind controler or so. I think we need at least PWM or so. it's just
> ideas. there is no test yet.
>
> and this is ?pARM?that I build last year and enjoied to play it.
> http://www.aleph.co.jp/~takeda/radio/parm/parm-scheme1.gif
> this is just analog part only we need MIDI-CV and LFO as digital part or
> so. I shoot some videos and put them to youtube.
> http://youtube.com/user/MMTAKEDA55
> there is no page about this yet. I'm on my way to write them.
>
> ps. You can chime in on my schem, any time. Give schem a chance.
>
> cheers!
>
> Motohiko Takeda
> Tokyo, Japan.