MOTM

Does anyone out there have more than one MOTM-100? I'm looking for a
particular effect and I'm wondering if it works in real life (not just on
paper).

Say you had three '100s, dealing here only with the S&H section.

Could you cascade them so that the output of one feeds the input of the
next, multing off the signal at each stage, to get a kind of canonic S&H
output? You know what I mean? One trigger fires all three, and each time it
fires, each S&H "passes on" it's 'value' to the next one in line?

Does that work?

Hi All !

Just cascading s/h's will not work :  opening 'em all up at the same 
time will just give you general drift :)  Inbetween one needs extra 
s/h's to keep the previous value stable until the value is aquired by 
the s/h that outputs it .  Look at how BBD's work, although in this 
case one could get away with much lower spec s/h's for the 
"inbetweeners" .

While i was typing the above, i was trying to remember where i saw 
such a circuit .... And here it is :

http://www.synthfool.com/diy/jhasr.gif

See the initials :  Juergen Haible :)

The cmos databook i have at hand (1977, where's my newer one ? :) ) 
does not give the 4098, but it's a dual monostable .  My guess is 
that here the last s/h gets triggered first, and then the "previous" 
one etc .  The logic circuit could be copied and applied to any bunch 
of s/h's i suppose .

How does the Serge do it ?

Bye for now .


Keep 'em oscillating :)


Hugo
=

Apparently yes. I ran into a website somewhere describing a Moog synth at
some college of music (maybe even UC Berkely?). Moog of course didn't
provide S&H modules except on a custom basis, but this web page describes
several custom modules that they had made to round out the system. One of
them was, surprise! - a triple S&H which passes the output of one to the
next, to achieve a pseudo canonic output. I think that all the inputs and
outputs can be used separately as well if desired.

I already have one of these planned to DIY. Great minds think alike.

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...

> -----Original Message-----
> From: Tkacs, Ken [mailto:ken.tkacs@...]
> Sent: Saturday, April 15, 2000 9:35 PM
> To: 'motm@egroups.com'
> Subject: [motm] Cascading S&H
>
>
>
> Does anyone out there have more than one MOTM-100? I'm looking for a
> particular effect and I'm wondering if it works in real life (not just on
> paper).
>
> Say you had three '100s, dealing here only with the S&H section.
>
> Could you cascade them so that the output of one feeds the input of the
> next, multing off the signal at each stage, to get a kind of canonic S&H
> output? You know what I mean? One trigger fires all three, and
> each time it
> fires, each S&H "passes on" it's 'value' to the next one in line?
>
> Does that work?
>
>
> ------------------------------------------------------------------------
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> http://click.egroups.com/1/2142/3/_/529958/_/955852997/
> ------------------------------------------------------------------------
>
>

Here's the page I was talking about:

http://arts.ucsc.edu/ems/music/equipment/synthesizers/analog/moog/Moog.html

OK, so it was Santa Clara, not Berkley - so sue me. Look about halfway down
for the custom triple S&H. Not much info about it, but somebody was able to
get around the potential clock timing issue that Hugh mentioned.

Good descriptions of each module's functions, especially the sequencer.

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...