Everson MD REbuild

[dmitri]

I must say these are very strange signals:
1. Half waves are very short for a mesh type pad. They are typically 2-4ms.
2. The signals are very irregular. They really should look like more or less as a decaying sine signal.

Are you sure you measured the signal correctly, i.e. on the input? If yes, then there is definitely something wrong. Try to get a scope reading on unconnected pad. Be careful not to hit too hard since unloaded (unconnected) piezo can produce very high voltage and damaged the sound card input.

[everson]

Yes, I recorded it through mic port on my laptop ...
This time I recorded it through mic/instrument port on my soundcard.

How does this look like?

[dmitri]

It looks like the mic input is overloaded. Try to read the signal on the mic input over a trim pot and adjust the trim pot until you read the full amplitude in the scope.

[everson]

OK, than I guess this will be ok ...

[everson]

And its closeup to a range of 10ms

[dmitri]

It's still clipped at the peaks. You need to attenuate it more.

[everson]

OK, here`s center:

[everson]

And close to edge:

[dmitri]

What happened to the signal, it is all in steps? The previous signal was almost good, you just needed to attenuate it a bit more or hit a just bit lighter.

[everson]

OK, here`s another shot: