[sdiy] M-Audio Radium CV to MIDI mod

[xamboldt]

I mentioned doing this to an Evolution MIDI controller a few months  
ago, and I first heard about it on the list quite a few months before  
that in posts by Grant Richter and Larry Hendry.

Anyway, I prevented negative voltage from getting into the circuit  
with a diode routing neg voltages to ground. I don't have any  
positive voltage protection other than the attenuator - although I'd  
like to add something. I was thinking of a zener, but haven't gotten  
around to trying it yet... Has anyone else?

-Chris

On Dec 5, 2005, at 4:06 PM, megaohm wrote:

> I don't remember ever seeing anything about this. But it is such a  
> simple concept I'm sure it's been done.
>
>   The Radium's pots have 5 volts on one leg, ground on the opposite  
> leg, and the wiper connects to a 4051. I disconnected the 5V source  
> at the pot and soldered a wire from the 5V pad to the switch of a  
> NC jack. The tip of the jack is wired to the pot leg (the one that  
> was connected to the 5V internal source. With nothing plugged in,  
> the pot acts exactly how it normally did. Pug an envelope in and  
> that becomes the voltage source for the pot.
>
>   This should work for any digital stuff that uses voltage divider  
> pots.
>
> peng
>
>
>
> On 12/5/05, Rafael Cohen <rafael.cohen at gmail.com> wrote:
> I vaguely remember the email on list about this process a while  
> back, but can you remind me how this mod goes?
> Thanks,
> Rafael
>