We can also add more LEDs with transistor to make it cooler. This generates a very interesting sequence of dancing LEDs which follows the beats as per their intensity or pitch. Transistor in this array works as amplifier, and glows the four LEDs according to the sound pattern. Then finally these music signals are given to the array of four transistors. Further a NPN transistor (Q1- BC547) is used to amplify the signals, from the High Pass filter. These voltage signals are further fed into R-C filter or HIGH PASS filter (R2 and C1), to eliminate the noise from the sound. In this Simple LED Music Light Circuit, condenser mic picks up the sound signals and converts them into voltage levels. This circuit is very simple and easy to build, it just requires few basic components and it looks very cool. Music Operated Dancing LEDs, in which LEDs will flash according to music, just like Disco light, as discussed above. This Musical LEDs circuit is based on transistor BC547. Now we are taking this to next level, i.e. Previously we have built Dancing LEDs, which just follow a set pattern and we can only control the speed. However the sensitivity of the circuit can be increased to pick the low notes too.
So these lights follow the high pitch beats in music like drum beats, and Turn ON and OFF according to music pattern. These lights glow according to the length and pitch (volume) of music beats, basically these are designed to pick the high intensity sound like Bass sound. You must have seen the Disco Lights or DJ lights, which Turn ON and OFF according to the beats of the music.
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