The main function of the circuit is the device of the circuit is IC1. This is a sound generator IC. The Christmas season. Its musical all 8 music. When the power supply LDR1 the exposure will cause voltage drop across R1 is enough to make IC1 work has output to stimulate pin 11 and pin 12 to stimulate pin B of Q1. Q2 and the current expansion drive that will be the speaker. While the circuit work if the switch S1 connected to the unique music tracks and so on, but if S1 is not connected. Circuit will play all the songs. If the switch S2 connected to the cycle When there is no light will stop play immediately. But if the switch S2 is not connected to music and no light will not stop until the song is finished playing.
Switch S3 is responsible for selecting music on, press 1 once one moves to music. The VR1 is also a tone control if VR1 is less resistance will be reduced to a lower tone. And the music will slow down play with. The R6, C3 is responsible for smooth sound more R7 forward to control the feedback stability of dc output of the circuit.
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