MOTM

Just received:

"The Quintessential PIC" by Sid Katzen. ISBN 1-85233-309-X. www. springer-ny.com

This is a *really* good book! It's actually explains HOW the insides work at a level not
insulting to the average person. MANY code examples!

Paul S.

I had a new MOTMer ask me last week about retired
modules.  So here is the very brief list (to the best
of my knowledge):

MOTM-100 NS/S&H
 * Replaced by the MOTM-101
 * New functionality added!

MOTM-110 VCA/RM
 * Replaced by MOTM-190 (and upcoming MOTM-130)
 * '110 utilized CEM 3330 Dual VCA chip
 * One of few socketed chips in MOTM line
 * New modules eliminate CEM 3330 reliance
 * New modules employ discreet circuitry

I am not aware of any more that are currently on the
hit list.

--Shemp

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Nope, that's it.

There is *always* a possibility of a pcb rev sneaking in. But nothing is
*planned*.

Paul S.

For those few of you who aren't familiar with the
socketed vs. unsocketed issue....

Chips that are either expensive or hard to obtain go
in sockets.  This lessens the chance for damage during
soldering.  It also allows the chip to be placed on
the board as the very last component.

Chips that are cheap and/or readily available are
directly soldered to the PCB.  Skipping the sockets
prevents the chips wiggling loose during transport (or
earthquakes).  It also eliminates any possibility of
corrosion building up between the pins and the socket
which can sometimes lead to an intermittent
connections or no connection at all.

Paul has done an excellent job of removing any
dependence on dedicated ICs.  The most popular of
these, CEM and SSM, have not been manufactured in many
years.  This allows for this ever dwindling stockpile
to be used for replacement parts in vintage synths. 
It allow makes MOTM easier and cheaper to repair with
off-the-shelf components.  Some might argue that it
makes it more reliable too.  A few current modular and
synth designers (who will remain nameless here) have
opted not to go this route and eat up the remaining
known supplies of chips--unfortunate to say the least.

Enough rambling for now.  I hope this helps explain
some things for people that are a bit newer here.

--Shemp
Coming up on my 4th anniversary!!!!!

> MOTM-110 VCA/RM
>  * Replaced by MOTM-190 (and upcoming MOTM-130)
>  * '110 utilized CEM 3330 Dual VCA chip
>  * One of few socketed chips in MOTM line
>  * New modules eliminate CEM 3330 reliance
>  * New modules employ discreet circuitry


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>>Paul Schreiber wrote:

>>There is *always* a possibility of a pcb rev sneaking in. But nothing is
*planned*.


Isn't this what happened with the original version of the MOTM-800 Envelope Generator?  We now have the "B" version of the circuit board that allows full ADSR operation with just a gate (no separate trigger pulse required).

To Paul's credit, there was a lot of discussion on the list before this board revision was made.  And as I recall, I believe that some of the list members had modification instructions at one time for converting the old 800 board to the new functionality.  (As someone who owns 5 of the original MOTM-800 modules, I'd like to know if these modification instructions are still available anywhere.)

Just another reason to buy MOTM quality!

-Chris-

At 6:23 AM -0800 2003/02/28, Tentochi wrote:
>A few current modular and
>synth designers (who will remain nameless here) have
>opted not to go this route and eat up the remaining
>known supplies of chips--unfortunate to say the least.

I'm sure this wasn't aimed at me, but I wish to set the record 
straight. I am selling some modules that use CEM and SSM chips. But 
I'm only selling modules to use up chips that I already own, a dozen 
or so that I bought in 1985 that are just collecting dust on my work 
bench. All future modules from me will not be using any CEM or SSM 
chips.

I did all 6 of mine but never wrote instructions it was so simple.  If you
don't find the docs out there, I will pull one of mine out and document it.
I need to pull mine out to do Moe Bradley's mods for LEDs anyhow. :)
LH

----- Original Message -----
From: CHRIS PARKER <cparker@...>
To Paul's credit, there was a lot of discussion on the list before this
board revision was made.  And as I recall, I believe that some of the list
members had modification instructions at one time for converting the old 800
board to the new functionality.  (As someone who owns 5 of the original
MOTM-800 modules, I'd like to know if these modification instructions are
still available anywhere.)

Looking at mine right now, it appears that the only mod is a jumper 
wire from R1 (the end closest to the jacks) to the normalling (top) 
lug of the TRIG jack.

Moe

--- In motm@yahoogroups.com, "J. Larry Hendry" <jlarryh@i...> wrote:
> I did all 6 of mine but never wrote instructions it was so simple.  
If you
> don't find the docs out there, I will pull one of mine out and 
document it.

> I need to pull mine out to do Moe Bradley's mods for LEDs anyhow. :)
> LH
>