The piezoelectric-magnetic hammer

[Rapadura]

Sorry... I don't want to seem inconvenient, but I had one more idea... 

I call it the the "piezoelectric-magnetic hammer", and it looks like this:

[Rapadura]

How it works (or should work):

If that electro-magnet over there is not getting electric current, but it suddenly receives a quick pulse of electricity (just a few miliseconds) in such a way that it causes magnetic REPULSION with the permanent magnet below it, the permanent magnet will be pushed down. So the hammer in the other extremity will go up, and then, gravity will pull the hammer, and it hits the piezoelectric material.

So, everything depends on how much electricity the piezoelectric material can generate, and how strong is the permanent magnet (the stronger it is, stronger will be the repulsion towards the same pole of the the electro-magnet, even if the electro-magnet is not so strong).

Can we dream that the piezoelectric crystal has capacity to generate enough electricity to activate the electro-magnet with a magnetic field sufficient to cause a strong repulsion towards the permanent magnet?

[Rapadura]

Wow...

In an extreme situation you can imagine that, at each impact, the piezoelectric crystal can charge  TWO capacitors. So, after seconds, only ONE capacitor is discharged to generate the pulse in the electro-magnet! Then we have a new impact, and TWO more capacitors are charged... This is insane!

Is it just delirium?

[Rapadura]

Allright, I'm starting to think that it's not just delirium...

Look what this guy did with only 3 volts and 480uF:

http://www.youtube.com/watch?v=6nowIn-QdbE

Magnetic repulsion between neodymium magnets and eletromagnets is huge!

And I also found this:

http://home.howstuffworks.com/question383.htm

"How does the lighter in a BBQ grill work?"

See what they say:

"For example, in a BBQ lighter, the popping noise you hear is a little spring-loaded hammer hitting a crystal and generating thousands of volts across the faces of the crystal."

I got it right? Thousands of volts? We only need 3 volts!

Even if we have very few milliamps, but with thousands of volts we can compensate for that...

[Rapadura]

OK, now this is good:

http://www.electronics-manufacturers.com/products/piezo-generator-245.html

"Ceramic multilayer generators are built up with a number of thin ceramic layers sandwiched between internal electrodes, resulting in a low output voltage but high current compared to conventional single layer piezoelectric generators."

We can use these with higher current and lower voltage!

And to improve the design of our device, we can put another piezo generator above the hammer, so when the hammer goes up it will impact a piezo generator, and when the hammer falls (pulled by gravity) it will impact a second piezo generator. Two piezo generators impacted in a cycle.