i actually tried this before i did the 555s. i had the hex schmitt
chips because i was following your 808 reports on AH and hoping to
build a version of the hh, cy and cb circuit (still gonna do it!). for
some reason, the individual pitch controls of the schmitt oscillators
interfered with each other quite a lot. if i remember correctly they
were soft-syncing each other so raising one pitch would raise others
with it. didn't you do individual pitch controls for the hex schmitt
in an 808 did you see this behavior it would definitely be an
attractive solution if someone could get it to work. much more elegant
than a s-load of 555s.

--- In tr-707@yahoogroups.com , "plutoniq9" <Plutonique9@...> wrote:
>
> I wonder if you could substitute a single Hex Schmitt-Trigger IC (i.e
> CD4069) to produce the clocks instead of 555's, as you can form 6
> oscillators from a single chip.....with minimal external parts (1
> capacitor + 1 pot per clock), you could easily build it on one of
> those mini RS pcb boards. The formula for freq is in the datasheets.
>
> Just a thought
>
> ryan
>
> --- In tr-707@yahoogroups.com , "gregory zifcak" <foleymachine@> wrote:
> >
> > well, i don't think it matters what kind of caps you use for 555s and
> > decay envelopes. i've had them work fine with polarized electrolytics
> > and ceramics.
> >
> > as far as the clocks, mine dip down into the audio range at their
> > lower end. you should be able to hear a faint whine if you touch their
> > outputs to the 707 outputs. if you can hear output, they should work
> > as clocks. accordingly, you can use these clock circuits as audio
> > oscillators if you use a bigger cap. there is a free dos program
> > called 555.exe which calculates the frequency of the oscillator when
> > you type in the values of the cap and resistor.
> >
> > --- In tr-707@yahoogroups.com , "philo_707" <philo_707@> wrote:
> > >
> > >
> > > Hmm, I'm def. a little confused about this one. I know the 555s I'm
> > > using are right, I followed the schematic posted here except for
> > > changing the resistor and cap values to the ones mentioned that
work,
> > > but no go yet. Would any .1 uf cap work
> > >
> > > For that matter, on the decay mod, will any 1.0-10 uF cap replacing
> > > the stock ones work Do they need to be electrolytic or non, or
does
> > > it really matter
> > >
> > > About the LCD, I bought a dead parts unit that probably has a
good LCD
> > > on it, so even if I am successful in my attempts to revive the fried
> > > one, I may have one nonetheless.
> > >
> > >
> > >
> > >
> > > --- In tr-707@yahoogroups.com , "Bart Provoost" <bart@> wrote:
> > > >
> > > > >
> > > > > To the guy who needed an LCD, I'm still doing repairs, but it
> looks
> > > > > like I will likely have a extra working LCD anyway, we'll see.
> > > >
> > > >
> > > > That's interesting ;)
> > > >
> > > > Bart
> > > >
> > >
> >
>