Odp: [sdiy] 1/8th inch questions

[Roman]

For 'audio' outputs with 1k ussual impedance, even with connected 10 modules,
100k impedance each, it introduces attenuation of (100/10)/(1+100/10)=0.909
that is less than 1dB. For tuning VCO it can be disaster, as it takes now more
than 13 semitones per octave. So for tuning outputs (midi2cv, sequencer, etc.)
one can use opamp with feedback taken from output resistor, put there for
stability purposes, and not from opamp's output directly.
No matter how many modules connected, this circuits maintains proper voltage,
up to opamp's current limits.

Roman

----- Original Message -----
From: Seb Francis <seb at is-uk.com>
To: elmacaco <elmacaco at optonline.net>
Cc: daryl groetsch <synth_dg at yahoo.com>; <synth-diy at dropmix.xs4all.nl>
Sent: Monday, October 21, 2002 11:16 PM
Subject: Re: [sdiy] 1/8th inch questions


> I would guess there is a limit to how many inputs you should run off 1 output.
Something to do with the input and output impedences, and maybe some other
factors - I expect someone else on the list can probably state this much more
mathematically !
>
> Especially be careful when running a CV that is also used for VCO pitch
control into other not-very-high-impedance inputs - you can introduce detuning
of the VCO.
>
> Seb
>
>
>
> elmacaco wrote:
>
> > The panel of jacks, wired together.  It's called a multiple.
> >
> > Easy to make.  I think 4 is the most common amount of jacks wired together.
> >
> > any one is the input, and then the rest are all outs.
> >
> > ed
> >
> > ----- Original Message -----
> > From: "daryl groetsch" <synth_dg at yahoo.com>
> > To: <synth-diy at dropmix.xs4all.nl>
> > Sent: Monday, October 21, 2002 12:09 AM
> > Subject: [sdiy] 1/8th inch questions
> >
> > > My modular synth uses 1/8th inch jacks. I've been
> > > hearing how banana plugs can be stacked to distribute
> > > signals in a more flexible manner. Too late to switch
> > > now! How do people out there acheive the same effect
> > > with 1/8th inch? Can you make a Y-cord by soldering
> > > two cords to one plug? Or maybe a panel with jacks for
> > > this purpose. Will CV levels change?
> > >
> > > thanks,
> > >
> > > Daryl
> > >
> > > =====
> > > http://www.darylgroetsch.com
> > >
> > > __________________________________________________
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>