MOTM

I completed my second 800 EG kit and I've been having a blast triggering
the BANK select input on my Miniwave with it. I have one question though....
I've heard some MP3 examples of a patch that seems to keep recycling the
waves in the same rhythm. I tried this by just holding a note down but it
only goes through one cycle. Is there any way of acheiving this?

            -John 



INFORM3R AUDIO + DISCOGRAPHY
-----------------
http://www.inform3r.com/audio.html

Feed LFO TRI into the BANK inputs, adjust rate to "sync up".

<Paul S>

----- Original Message ----- 

From: "inform3r" <inform3r@...>
To: "MOTM List" <motm@yahoogroups.com>
Sent: Tuesday, June 25, 2002 5:36 PM
Subject: [motm] 800 EG triggering Miniwave


> 
>     I completed my second 800 EG kit and I've been having a blast triggering
> the BANK select input on my Miniwave with it. I have one question though....
> I've heard some MP3 examples of a patch that seems to keep recycling the
> waves in the same rhythm. I tried this by just holding a note down but it
> only goes through one cycle. Is there any way of acheiving this?
> 
>             -John 
> 
> 
> 
> INFORM3R AUDIO + DISCOGRAPHY
> -----------------
> http://www.inform3r.com/audio.html
> 
> 
> 
> 
>  
> 
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ 
> 
>

Another issue involves the voltage level it takes to cycle through all
banks.  Unmodified, it takes 10 volts positive to get to the top bank (or
wave).  Using a MOTM-800 you get only 1/2 way there.

There is a modification at my website, adding two resistors to the PCB, that
raises the gain in the CV input buffer to allow full range control with only
5 volts.  Since you have any input attenuator on the Miniwave, you can
always dial it back to 50% when using a full 10 volt control.

http://www.wiseguysynth.com/larry/mw2090/cv_mod.htm

Stooge Larry


----- Original Message -----
From: "inform3r" <inform3r@...>
>     I completed my second 800 EG kit and I've been having a blast
triggering
> the BANK select input on my Miniwave with it. I have one question
though....

> I've heard some MP3 examples of a patch that seems to keep recycling the
> waves in the same rhythm. I tried this by just holding a note down but it
> only goes through one cycle. Is there any way of acheiving this?
>
>             -John

I already have a Time Machine kit, and a Stooge panel on order, and I will
eventually order a Miniwave kit.  I'm not in module-building mode right
now, but I ordered the TM just so I could get one before they run out.

Since pots are often backordered, I was thinking that perhaps it would be
wise to place my pots order now, so that I wouldn't have to wait when I was
ready to build.  Afaik, I need ten 50K linear pots.  I also need an
additional pot for a mod I am adding, most likely log.

The MOTM modules from Synthesis Technology seem to use Spectrol 149 for
PCB-mounted pots and Bourns 91 for panel-mounted pots.  It doesn't seem
like Digikey sells Spectrol, and it doesn't seem like Mouser sells Bourns
91.  Also it looks the Bourns 91 in the Digikey catalog are PCB mount.  So
are the 149 in the Spectrol catalog.  None of them have wire lugs for panel
mounting.  There also seems to be a lack of offerings with log tapers.

I looked at hotrodmotm.com/parts_list.htm, but it didn't list any pots with
wire lugs, just "pc terminals".  If I have to use PCB pots, what should I
do??  If necessary, which size and type of heat-shrink tubing would be
best??

What difference do cermet and conductive plastic make??  Is one or the
other better for certain applications??

Does anyone make high-quality 50K linear pots with center-detent??

Larry mentions a Spectrol 148 on his page, what is that??

For those of you in the U.S. who have built Blacet MOTM kits, which pots
did you use and where did you buy them??

THANX!! :)

50K Bournes pots from Allied:

Stock
Number   Mfr Part Number
-------- ----------------
754-9418 91A1A-B24-B18

> <snip>
> What difference do cermet and conductive plastic make??  Is one or the
> other better for certain applications??

Cermet is almost 10x more temp stable and can about 2x more power, but adds
about 2x more noise and has half the rotation life, than conductive plastic.
Conductive plastic is available in a wider range of values.

> Does anyone make high-quality 50K linear pots with center-detent??

Vishay-Spectrol makes these, model 149-S-D-G-64-S-503-S-S (I think).  Don't
know who stocks them though.  (that last S means solder lugs, not PC
terminals, by the way)

> Larry mentions a Spectrol 148 on his page, what is that??

148 is conductive plastic, 149 is cermet.  MOTM uses both.

Cheers,
George

http://www.geocities.com/SunsetStrip/Underground/2288/2ansynth.htm

I hadn't seen this before.  I hope someone finds it useful.

--Shemp