DIY drumpad/controllers

[CRYSTAL AWARENESS]

--- Martin Czech <martin.czech at intermetall.de> wrote:
> :::I was thinking of makeing some "tubular bells">
with clear perspex 
> :::(illuminated from the top) with a XTAL earpeice>
as the pickup.> :::
> :::When you strike it two things happen;> :::
> :::1) the xtal generates a signal,>
amplify/fullwaverectify and bingo one 
> :::trigger that is velocity sensative (harder you
> hit it, the bigger the CV), 
> :::all you need is a S&H to sample the CV whe its>
above a certain level and 
> :::hold it until the next time.
> :::2) This is my daft extra, the perspex is lit by
a> bulb, that gets bright 
> :::then fades as you you hit it... eat your heart>
out JMJ!!!> :::
> :::Paul full of stupid ideas> > 
> I recently toyed arround with piezo/midi triggers.
> It is also interesting to use the piezo spike as>
input for
> those cheezy drum box resonator circuits, this>
should
> work as well. These circuits are in my first>
electronics
> book that I bought with 15 or so.> > m.c.> howdy
Martin,Paul,& DIY,
there is a circuit in the Feb'83 issue of Polyphony
magazine called the Dynamic Touch Controller* which
will perform the function of holding a peak voltage
from a piezo trigger signal. i built a dual version of
this that worked fairly well. it neaded a lot of trim
pot tweaking to work reliably. i do not have a scanner
but could probably use someones if anyone wants to see
it. i will be traveling for two weeks starting wed 7/7
so it may take a while. i could also snail mail it.
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