MOTM

Rather than bug Paul, who is busily putting together my kits as you 
read this, I thought I'd solicit information from the group about the 
MOTM-850 pedal interface.  I'd like to abuse it, of course, but could 
someone tell me what type of input (voltage and connections) it 
needs?  I have no familiarity with the control pedals that would 
normally be used.

Thanks!

Chub

As with all other MOTM modules, this one does respond favorably to 
abuse :)

I use it mainly with a Roland EV-5 pedal.  I don't have the info in 
front of me regarding voltages, but I think that's on the site.  Some 
people hate the Roland pedal and prefer the Yamaha pedal (model 
number escapes me).  Some people have modified the 850 to interface 
with a joystick.  I think taht info is on Stooge Larry's (the 
designer of the original concept) site.  Search this list's archive 
for lots of info on the 850 and pedals.

One more cool thing about the 850: it's a gate source!  So you could 
do stuff like bring in another timbre by stepping on the pedal 
simultaneously to controlling a CV.

Pretty cool!

Mike

--- In motm@yahoogroups.com, "osthelder <osthelder@n...>" 
<osthelder@n...> wrote:
> Rather than bug Paul, who is busily putting together my kits as you 
> read this, I thought I'd solicit information from the group about 
the 
> MOTM-850 pedal interface.  I'd like to abuse it, of course, but 
could 

> someone tell me what type of input (voltage and connections) it 
> needs?  I have no familiarity with the control pedals that would 
> normally be used.
> 
> Thanks!
> 
> Chub

Since the input on the 850 came from my circuit, I'll answer this.

The pedal input on the 850 will accept one of three different types of
inputs.
1. CV from a pedal that does the 0 to whatever voltage.  Use the 850 to
scale /  offset / mix / gate extract from a plain CV pedal or other CV.
2. pot type pedal with wiper wired to ring.
3. pot type pedal with wiper wired to sleeve.

The input circuit is set up to work with both these wiring arrangements (2
and 3 above) on a TRS style jack.  I have a free bracket (your size choice)
and free shipping of bracket to the first listmember to guess / figure out
how that works.  The bottom line is the two possibilities for pedal wiring
TRS jacks (Yamaha uses one and Roland uses the other) both work with the 850
without wiring changes.  And, a 1/4 mono jack (as in any CV from pedal or
otherwise) works too.

The 850 is set up standard to accept 3 common pot sizes.  8.5K (just happens
to match Roland EV-5) 50 K, just happens to match Yamaha FC-7 and 100K.  Any
pot size can be accommodated.  A simple resistor change is needed for other
sizes to maintain the exact scale on the output.  For 8.5K = Roland, set the
jumper to "R", for 50K = Yamaha, set to "Y." for 100K, simply remove the
jumper.

Larry

----- Original Message -----
From: <osthelder@...>
To: <motm@yahoogroups.com>
Sent: Friday, January 31, 2003 7:56 AM
Subject: [motm] MOTM-850 questions


Rather than bug Paul, who is busily putting together my kits as you
read this, I thought I'd solicit information from the group about the
MOTM-850 pedal interface.  I'd like to abuse it, of course, but could
someone tell me what type of input (voltage and connections) it
needs?  I have no familiarity with the control pedals that would
normally be used.

Thanks!

Chub




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