The 500K variable resistor produces the melody with the required amount of light. After adjusting the required light intensity, the circuit will produce the melody with the same amount of light every day.You can also use this circuit as a light activation alert for other light sources, to which you must also adjust the 500K variable resistor to produce the melody based on the amount of light required.The melodic circuit is built around UM66 IC, a CMOS IC encapsulated by to-92 transistors.
