MOTM

OK, OK..  I fired up my MOTM-850 prototype (not the same, but close enough),
and I have my Yamaha BC-2 breath controller working just fine with it
through a small daughter board with one op amp, and 4 resistors.  It will
require four wire connections to the MOTM-850, none of which will require
modifying the 850 electronics in any way.  Of course, you will have to drill
one hole in the panel to mount the jack for the BC to plug into.

As soon as I get my MOTM-850, I will tweak the resistor values to match the
real thing, build the daughter board, install the modification on my 850 and
post photos and schematics on my website for anyone to use.

I am in search right now for a very small PCB that will be just right for
the job.

Now, there is one other possibility which I have not tried, but I think it
will work and I will follow up if anyone is interested.  I instead of
modifying the 850, this small PCB could be mounting in a very small project
box with a jack for the Yamaha breath control on one side and a jack on the
other side to patch to your 850.  I think the PCB in the box could draw its
power from the 850 pedal in jack.  Whadda ya think?  Makes the circuit a lot
more challenging though.

Larry (I think the Breath controller will be cool) Hendry

----- Original Message -----
From: <elhardt@...>
To: <motm@yahoogroups.com>
Sent: Saturday, October 27, 2001 10:12 PM
Subject: Re: [motm] 850 module question, yamaha breath controller schematics


>>Hey, does anyone know what Kind of signal comes out of Yamaha's breath
controllers?  Possible 850 compatiblity?<<

>>Something weird about these controllers is that they take power between
gnd
and -15v .<<

If you search through the past few months of posts in the archives I posted
what I measured the voltages to be.  Negative voltages are there, and none
of
the tip/ring/sleeve had ground on it.  It isn't what it seems like it should
be.  Nobody else seems to be able to confirm or deny what I measured so
apparently nobody has ever built anything for it.

-Elhardt