In order to increase people’s audio-visual enjoyment while stringed instruments are playing

without affecting sound effects of stringed instruments

use vibration sensor to detect vibration signal of strings

vibration signal is isolated amplifed through the charge amplifier

after filtered by active filter

output drive light-emitting diodes（ LED） mounted on stringed instruments

LED light and shade alternately in accordance with the vibration of the strings. Experimental results show that this method enhances the light effect of stringed instruments on the stage.