Re: piezo pick hum

[Charles Zwicky <cazwicky@earthlink.net>]

Piezo crystals have a very high output impedance,  this makes then 
very susceptible to RF and other  forms of electromagnetic 
interference.    However, it looks like the Soloette has a built in 
preamp, so the output impedance will be much lower than the pickup 
itself, and shouldn't be a problem.

Do you hear these noises when the guitar is connected directly to 
headphones?



At 7:58 PM +0200 7/15/13, Michael Peters wrote:
> http://www.michaelpeters.de/temp/soloette-hum_0001_0.wav
>
> When I plug my Graduette Soloette guitar (a nylon string travel guitar with
> a piezo pick) into the external soundcard of the laptop and launch Bidule 
> to
> hear it, I find that it hums - a deep drone hum plus a high whining sound.
> This does not happen with regular electric guitars. My technician says it
> has to do with the piezo. When I put a finger on the jack cable that sits 
> in
> the connector in the guitar, the noise stops. 
>
> I can get rid of the deep hum with a plugin, but the high whining noise is
> still there. I can't play with my finger on the jack cable all the time. Is
> there a simple way to get rid of that noise?  a special VST plugin?  or 
> some
> kind of grounding cable that I connect to the plug? and where does the 
> other
> end go?  I need a quick and simple solution. Help!
>
> -Michael


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