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this toy is for all the music lovers. you can convert a simple toy motor into a violin
generator by reversing the functionality of motor. you just need a pulley, two LEDs, a
spoke and bottle caps. this is a simple motor to which you will attach a pulley. now in
a regular motor, when we connect it to a battery it rotates the pulley. in a generator we have
attached a LED instead of a battery. and when we rotate the motor, it generates electricity
and lights up the LED. connect this LED to a bottle cap. when you rotate the LED should
light up. make this bow with a cycle spoke. connect another LED to the motor in parallel
but in reverse bias so that the same point is connected to one LED and positive of other.
our violin generator is now ready. take this bow and wrap it around the pulley. start playing
the violin and generate electricity. when you play it in one direction one LED light
ups. when you play it in the other direction the other LED light ups. this is because we
have connected the LED in parallel but in opposite directions so when we play the bow
on one side the pulley rotates clockwise and hence one LED lights up and when we rotate
it anti clockwise other LED lights up because the current is now flowing in other direction
and the first LED will not light up. play the violin and have fun.