simple electronic piano using 555 timer toy organ circuit. 30 01 2016 a simple electronic toy piano can be easily constructed using the popular 555 timer ic 555 timer can be easily wired as astable monostable or bistable multivibrator we all know that sound is a mechanical wave as it is produced by to and fro movement of particles of the medium displacement of particles are in the same direction as propagation of sound waves so sound is a longitudinal wave.
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