You will require the following parts to make your own musical greeting card:
A readymade printed greeting card having a rigid body – 1 no.
A musical IC, also called COB, select one which may have one of your favorite embedded melodies, like “Silent Night,” “Home Sweet Home,” “We Wish You a Merry Christmas,” “Titanic,” etc.
Transistor 8050 and BC 557 = 1 each
Piezo Buzzer = I each
Resistor 2K2 = 1 each
LDR = Producing less than 10K resistance under normal house interior lights
Button Cell = 3 Volts
A bundle of flexible wire = 7/36
Thin opaque plastic or cardboard sheet, cut exactly to the size of the procured greeting card
Good quality glue for sticking plastic to paper