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  #1  
Old 26.08.2005, 09:05 PM
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Default Home-made Midi Triggers

Hi,
i just started this project,
i bought 6 10V piezo discs and foam for making my own midi drum triggers. What i find out now is that all the CV->Midi converters only support like up to 5 volts! I doubt anyone can help me with this, though i can still complain and feel bad that i wasted 5 $ away on the piezo discs when they dont work with the converters/drum brains
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  #2  
Old 27.08.2005, 01:59 AM
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May I ask...

What are piezo discs?
How do they output a voltage?
How does this voltage correnspond to a note?

An url about CV would also be acceptable
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Old 27.08.2005, 05:08 AM
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Quote:
Originally Posted by pDc
What are piezo discs?
A piezo element. It's a thing that resonates when supplied with AC (thus can be used as a simple speaker) or it creates a small voltage spike when hit.

Quote:
How do they output a voltage?
See above.

Quote:
How does this voltage correnspond to a note?
It's a trigger and the voltage can be used as a velocity curve.
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Old 27.08.2005, 05:18 AM
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Default Re: Home-made Midi Triggers

Quote:
Originally Posted by techno_7
i bought 6 10V piezo discs and foam for making my own midi drum triggers. What i find out now is that all the CV->Midi converters only support like up to 5 volts!
Well, first of all, transforming 10 volts to 5 volts is not a problem. It can be done for example this way:

Input >-----[====]---->Out<-----[====]-----| Gnd
10MOhm 10MOhm

The resistors here can be other sizes too, but I prefer big values as voltage dividing resistors. As I haven't done anything with piezos and not even quite sure how they work, I have no idea how that dividing would affect the voltage spike. You could always drive it with an opamp or transistor if it runs out of juice - And I think it's preferrable anyways, or even must-to-do.

Could you give me some details on how you've planned to make the triggers?
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Old 27.08.2005, 06:50 AM
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Yeah, sure.



As you can see on the pic, i am going to "sandwich" the piezo disc between some foam to make it less sensitive(so the velocity arent full values all the time) and to give it a nice feel.

Then the 2 wires coming out of the piezo are connected to a 1/4 inch (jack i guess, im not sure actually) cable, that goes into a voltage transformer and then in a CV>MIDI converter/drum brain.
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Old 28.08.2005, 02:48 PM
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doepfer has released alot of their prebuilt components that allow you to build your own box. also check out www.ucapps.de (midibox project)
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Old 28.08.2005, 04:27 PM
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What does that have to do with drum triggers?
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Old 31.08.2005, 05:42 AM
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Quote:
Originally Posted by techno_7
What does that have to do with drum triggers?
My bad. I though you were refering to drum triggers like the trigger finger. Didnt think you acually meant a kit.
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Old 31.08.2005, 02:02 PM
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Oh but i was. Sorry if i misunderstood you.
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