Aftertouch

[Tony Allgood]

Hi all,

Wow, I have been having fun with aftertouch this afternoon! My D-50's
keyboard does have aftertouch, but it was never really that good because
you had to rest a small elephant on it to get it to respond. Solution:
simply stick a small opamp gain stage, between the output of the sensor
buffer and the MPX chip, a 4051. I used an amplification of just 2, and
the D-50 is now amazingly responsive. I used a 10K resistor on the
op-amp's output to protect the MPX chip from over voltage. No need to
cut the D50's PCB, just remove a 10K SM resistor on the panel PCB, and
solder your input and outputs on. Now, my Kenton Pro-2 actually gives
out the full 127 levels of aftertouch without problem. Simple, but very
efective.

Now I just need to find a home for the elephant!!

Regards,

Tony Allgood  Penrith, Cumbria, UK

Walsh synthesiser, SuperLadder, TB303 clone and rack mounted filter

http://www.techrepairs.freeserve.co.uk/projects.htm