[sdiy] touchplate keyboard - works!

[Peter Grenader]

All,

I've been working on something for myself on the weekends (i'm allowed to
work on my own stuff on the weekends!) for a while now and I've finally got
a camera to shoot a picture for you guys.

It's an adaptation of a Serge Programmer circuit which appeared in SYnasple
some three million years ago, with five stages instead of four and
incorporating touchplates using those extremely cool piezo switches I've had
laying around for a couple of years now, waiting to find the time to make
this thing.  I also gave Smokin' Joe a proper home and slapped him in the
corner (he being my joystick controller).

Each key (stage) has the following inputs/outputs/controls:

Send input (from the Sergecircuit - a pulse pulls the stage active)

Gate output (remains high until another stage is selected)

Pressure Output

Voltage output (from the voltage level pot)

Voltage Level Pot (sets the voltage output for that stage)

LED indicator (lights when stage is active)


The Summed Outputs consist of the following:

Trigger out (marked gate on faceplate)

Tuned Output ( the voltage pot outputs of the active stage)

Linear Voltage  (outputs 2, 4, 6, 8 and 10 volts out of stages 1, 2, 3, 4
and 5)

Lagged Output (adds an adjustable slew to the tuned output)

Summed Pressure output

Lag Time/Pressure Sensitivity Pot (I used one dual pot for both features as
I was out of faceplate real estate).

Then there's Smokin' Joe - my Laughably Simple Joystick Controller flisted
on my DIY page

Wanna see a pciture?...

http://www.buzzclick-music.com/motiv1.jpg

This is one thing my system I was constantly wishing I had - a means to
create manual independant triggers and voltage levels.   For those of you
doing bug music that don't have a Serge Programmer or TBK or a Buchla
Touchplate, you're kidding yourself thinking a keyboard with a Midi to CV is
sufficient.  What I appreciate about this arrangement now is I can (finally)
trigger independent events from each key.  Reaktor allows you to do this
because it you can select a midi note number range for each module's input,
however I was sick and tired of tying up my Event Timer in order to create
Voltage threasholds to do this with my Midi to CV.  Now I don't have to.
Yipp!

And in that I retained the Serge 'send' input to each stage, this module can
become a arbitrary voltage generator or a sequencer if driven form a pulse
sequence.

Here is a close up of the piezo switches I used for the touchplates:

http://www.buzzclick-music.com/piezo.jpg

I'm glad this one is completed, it was a ton of work!

- P









Along with the touchplates, I added a linear voltage output (gives 2, 4, 6,
8 and 10 volt outputs out of the five keys), a tuned output, which is the
summed output of the voltage pots, a lagged output which slews between those
tuned voltages