[sdiy] Paia Vocoder clarifier mod toggle?

[Seb Francis]

Crosstalk, on/off resistance and distortion are the main things.  Crosstalk is probably the worst problem.  It's possible resistance could also be a problem depending on what you are switching (typical ON is 80R for a cheap switch, but could be up to 200R or so; OFF resistance is normally high enough even for cheap switches).  Also, check the voltage range is enough for what you need.

It might be worth trying it first with something like a CD4053 (very cheap) and seeing what results you get - might not be too bad.

Seb


Stephen Begin wrote:

> What (in practice) is the difference between high quality analog switch ICs
> and cheap ones?
> -Steve
>
> ----- Original Message -----
> From: "Seb Francis" <seb at is-uk.com>
> To: "Stephen Begin" <trypannon at hotmail.com>
> Cc: "synth" <synth-diy at dropmix.xs4all.nl>
> Sent: Sunday, September 22, 2002 5:46 PM
> Subject: Re: [sdiy] Paia Vocoder clarifier mod toggle?
>
> > If you're not too worried about cost, you could try some high quality
> analog switch IC(s) to switch all of the bits in and out.  Not sure if cheap
> ones would be a good idea though ...
> >
> > Seb
> >
> >
> > Stephen Begin wrote:
> >
> > > Sorry for reviving a dead thread, but I'm the type who likes closure.
> > > Given that for some strange reason, me and Phil here seem to wish to
> embrace
> > > the not-so-great-but-ever-so-rad-sounding original vocoder circuit
> design,
> > > but would also like the option of using opamps and getting a cleaner
> sound,
> > > is there any practical way to mod it so that the clarifier mod is
> > > switchable?  Nobody really said before if it could or couldn't be done.
> :)
> > > Thanks!
> > > Steve B
> > >
> > > From: "p. hendricks" <ph at attbi.com>
> > >
> > > > I agree,, and would share the same concerns. I like mine the way it
> is,
> > > and
> > > > use it just for cross modulation, I think you may lose some of that
> sound
> > > > with the mod....??? can you just do the part of the mod that improves
> the
> > > > S/N ratio? I don't mind having the bands interact, I don't want mine
> to
> > > > sound like ...well... a vocoder. I think the bands blurring together
> may
> > > > give a less synthetic sound with cross mod??? just a hunch.
> > > >
> > > > Note: I say all this not having heard one with the mod done, just
> would
> > > hate
> > > > to lose the sound it has now.
> > > > best,
> > > > phil
> > > >
> > > >
> > > >
> > > > On 9/14/02 8:14 PM, "Stephen Begin" <trypannon at hotmail.com> wrote:
> > > >
> > > > > I don't really plan to do much in the way of speaking intelligible
> > > phrases
> > > > > through the vocoder, more like adding unusual characteristics to
> short
> > > synth
> > > > > sounds.  So sometimes a little muddiness is nice.
> > > >
> >