Help


from Wikipedia
« »  
The last type of guitar is commonly called an " acoustic-electric " or " electro-acoustic " guitar, as it can be played either " unplugged " as an acoustic or plugged in as an electric.
The most common type is a piezoelectric pickup, which is composed of a thin sandwich of quartz crystal.
When compressed, the crystal produces a small electrical current, so when placed under the bridge saddle, the vibrations of the strings through the saddle, and of the body of the instrument, are converted to a weak electrical signal.
This signal is often sent to a pre-amplifier, which increases the signal strength and normally incorporates an equalizer.
The output of the preamplifier then goes to a separate amplifier system similar to that for an electric guitar.

1.805 seconds.