Piezo trigger circuit

[Neurotic]

The wires on the right are connected to a regular PC keyboard and if shorted they activate the letter "K" on the keyboard. The circle on the left is a piezo transducer (also known as pickup for guitars etc...) and I suppose you know what it does

The question is, how do I put this things together so when the piezo is active (in case of hitting, vibrations...) it closes the circuit and the key "K" is activated. I suppose I need some kind of amplifier cause the piezo alone generates very weak signals.

I am not skilled in electronics, besides basic soldering and understanding, so I guess I'm gonna need you to draw me a full scheme so I can build this.


Help would be much appreciated.

Neurotic

 

[audioguru]

The piezo can be connected to the base and emitter pins of a transistor and the keyboard can be connected to the collector and emitter pins. But the correct polarity must be used.
An e-drum is an electronic drum that uses a piezo transducer to generate a pulse when it is hit. Here is a simple circuit:

 

[Neurotic]

Yep, I guess that's what I needed. I'm building e-drums without velocity until I can afford to buy a midi trigger like megadrum or even a module.

Thanks a lot! I'll contact you if I have any further questions.

Neurotic