MOTM

Here is an illustration of what the front panel
of the MOTM-730 VC Pulse Divider will look like.

www.synthtech.com/pix/m730_illus.jpg

Thanks to Ken Tkacs for helping with the Corel Draw artwork. I hope Dave
Bradley can get well (been sick several days), he is working on a detailed
rendering that will look more realistic. Ken's is for the actual silkscreen
used to make the front panels from my AutoCAD drawing (which in
turn was greatly assisted by Tim Servo).

There is a 'bug' in the drawing, the DIVIDE switch is in the wrong position
for what the display is, that's my fault (didn't catch that until just now).

I should have a production sample for Robert Rich to torture-test on July 
3rd.

Production/delivery in late August. Just doing all the CAD work now and 
handed
off, still concentrating on getting the backlog shipped. I made quite a dent 
this week,
shipped 17 orders and finished the MOTM-420 kits. Next up: MOTM-190s.

Paul S.

On 6/13/08, Paul Schreiber put forth:
>Here is an illustration of what the front panel
>of the MOTM-730 VC Pulse Divider will look like.
>
>www.synthtech.com/pix/m730_illus.jpg

I probably missed an earlier post, so sorry if this was covered this
already, but what does the interval switch (4th, 5th, octave) do??

I recently built a CGS65 tube VCA in MOTM format using a panel and
bracket from Bridechamber.  The version I built was heavily modified
from the original in order to reduce noise and improve the CV
response.  I'm quite happy with it :)

Even though it is tube, it runs off the +15/-15V rails.  By using a
miniature Russian "pencil" tube that is about the size of a pen cap,
the module doesn't require a separate power supply or draw an
excessive amount of current.

It is a very versatile and unique module.  Nothing else sounds like
it.  The amount of distortion is dependent not upon the level, but
the rate of change of the CV input.  I don't know of any other device
that does that.  You can also get different sounds by sending audio
to both the CV and audio inputs.


Here is a description of the original circuit:

http://www.cgs.synth.net/modules/cgs65_vca.html

Here is a description of my modifications:

http://electro-music.com/forum/topic-26469.html



Bridechamber sells the assembled module (although not with my mods
:), a full kit (only $75!!), the panel, bracket, and the tube:

http://bridechamber.com/bridechamber.com/C%20Tube%20VCA.html

If he is out of tubes, I bought extra, or you can find them on that
auction site.  You can get the PCB from Ken Stone.

It's a rather simple circuit, with only two dual op-amps and one
tube, that only takes about an hour or so to build.  So it's an easy
and inexpensive way to add tube synthesis to your modular, without
having to buy a noisy overpriced piece of crap covered in pornography
:)



While I'm typing, here are a couple of things I have for sale:

Morley Rotating Wah  http://telrayoilcanaddicts.yuku.com/topic/661

Garfield Doctor Click http://electro-music.com/forum/topic-26991.html

> I probably missed an earlier post, so sorry if this was covered this
> already, but what does the interval switch (4th, 5th, octave) do??
> 

The STEPPED output is an 8-level rising sawtooth (starting at 0V and
going positive). The 4/O/5 switch is the step size. It is not calibrated,
but "close enough for rock". The 2 prototypes were within 4mv of
'correct'. You can always use a FM attenuator to 'dial in' if you want.

Paul S.

I'm looking forward to the video that illustrates what the heck this  
thing does. (I sorta get it, mostly.)

On Jun 13, 2008, at 8:06 PM, Paul Schreiber wrote:

> Here is an illustration of what the front panel
> of the MOTM-730 VC Pulse Divider will look like.
>
> www.synthtech.com/pix/m730_illus.jpg
>
> Thanks to Ken Tkacs for helping with the Corel Draw artwork. I hope  
> Dave
> Bradley can get well (been sick several days), he is working on a  
> detailed
> rendering that will look more realistic. Ken's is for the actual  
> silkscreen
> used to make the front panels from my AutoCAD drawing (which in
> turn was greatly assisted by Tim Servo).
>
> There is a 'bug' in the drawing, the DIVIDE switch is in the wrong  
> position
> for what the display is, that's my fault (didn't catch that until  
> just now).
>
> I should have a production sample for Robert Rich to torture-test on  
> July
> 3rd.
>
> Production/delivery in late August. Just doing all the CAD work now  
> and
> handed
> off, still concentrating on getting the backlog shipped. I made  
> quite a dent
> this week,
> shipped 17 orders and finished the MOTM-420 kits. Next up: MOTM-190s.
>
> Paul S.
>
>
>

It only does 2 things:

a) you put in a waveform and it squares it up, then outputs a 0 to +5V 
square waves that are a division of the input.

Input 1000Hz, the /2 = 500Hz, /3 = 333.3Hz, etc

The *main* use is to input a wave that is relatively slow (say 50Hz) and 
then get *multiple* 'trigger/gate' outputs
for EGs. Yon can then get notes VCF'd or VCA'd evey 'X' notes (say every 14 
notes). The CLK IN can be the GATE out
of a synth/MIDI-CV, this allows you to 'count notes' and trigger an event up 
to every 33 notes.

If you have Robert Rich's CD 'Electric Ladder', the first 3 cuts use the 
'730 original protype all over.

b) it ouputs a 8-step, rising sawtooth that is divided from either the input 
or the variable clock (/N). Can
feed a VCO for little apreggo runs, or whatever.

c) you can run up to 14KHz or so into it, you can make a cheesy Hammond 
organ by combining outputs (via MOTM-830)
into a VCF.

Paul S.

Paul -

A stupid cosmetic question -

The 730 illustration seems to use non-"standard" size knobs.  Is this
a quirk of the illustration?

Bill and Will






--- In motm@yahoogroups.com, "Paul Schreiber" <synth1@...> wrote:
>
> It only does 2 things:
> 
> a) you put in a waveform and it squares it up, then outputs a 0 to +5V 
> square waves that are a division of the input.
> 
> Input 1000Hz, the /2 = 500Hz, /3 = 333.3Hz, etc
> 
> The *main* use is to input a wave that is relatively slow (say 50Hz)
and 
> then get *multiple* 'trigger/gate' outputs
> for EGs. Yon can then get notes VCF'd or VCA'd evey 'X' notes (say
every 14 
> notes). The CLK IN can be the GATE out
> of a synth/MIDI-CV, this allows you to 'count notes' and trigger an
event up 
> to every 33 notes.
> 
> If you have Robert Rich's CD 'Electric Ladder', the first 3 cuts use
the 
> '730 original protype all over.
> 
> b) it ouputs a 8-step, rising sawtooth that is divided from either
the input 

> or the variable clock (/N). Can
> feed a VCO for little apreggo runs, or whatever.
> 
> c) you can run up to 14KHz or so into it, you can make a cheesy Hammond 
> organ by combining outputs (via MOTM-830)
> into a VCF.
> 
> Paul S.
>

> The 730 illustration seems to use non-"standard" size knobs.  Is this
> a quirk of the illustration?

No. The knobs & pots are from the MOTM Frac panels. The knobs
use a 18-tooth knurl press-on collet.

Paul S.