[sdiy] touchplate keyboard - works!

[Romeo Fahl]

Are those elevator switches?  Where the heck does one buy something 
like that, anyway?

Romeo

On Feb 4, 2005, at 8:35 PM, Peter Grenader wrote:

> 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
>