To make it even cooler, more LEDs can be added to the array with additional transistors. This creates an interesting sequence of dancing LEDs which follows the beats of the sound, depending on their intensity and pitch. An NPN transistor (Q1- BC547) is then used to amplify the signals from the High Pass filter, before being sent to an array of four transistors.Įach transistor in this array acts as an amplifier and illuminates the four LEDs according to the sound pattern. These voltage signals are then routed through a R-C filter or High Pass filter (R2 and C1) to filter out any noise from the sound. In this Simple LED Music Light Circuit, a condenser microphone is used to pick up sound signals and convert them into voltage levels. Music Rhythm Operated LEDs using BC547 Transistors Download Working Principle
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