> This was discussed earlier, but I can't find the thread. I think
> someone said, that Yamaha BC2 breath controller could be connected
> directly to a modular, although the voltage levels would not be optimal.
>
> I have BC3, which I can connect via MIDI using SY99 synth between. I
> would like to try analog connection. BC3 has stereo miniplug and
> connecting that directly to modular does nothing. Can you help
>
> Best regards
> Jari Jokinen

As our new DIY/OEM product WHEEL ELECTRONICS can be used with the BC3 too we
made some investigations during the last few months. The BC3 uses a hall
sensor and requires a positive supply. We tried successfully +5V as we could
not find a spec concerning the allowed max. supply range for the BC3. The
operational amplifier (MC4558) used in the BC3 will work even with a higher
supply voltage but we are not sure concerning the max. supply voltage for
the hall sensor (we could not find a data sheet of the THS105 hall sensor).
With +5V supply the BC3 outputs a voltage in the range of about +5V (no
pressure) ... +2V (max. pressure). So you need some additional electronics
to make available a +5V supply and to invert and amplify the CV coming from
the BC3 as +5...+2V are not very useful.

Best wishes
Dieter Doepfer