8 Note Tune Player

  
This neat little circuit can play 8 note tunes at any speed you want. You select the notes with 8 trim pots. The speed in selected through a ninth pot. The circuit draws very little power and can be powered by a 9 volt battery, with the addition of a 7805 regulator to power the TTL logic used.
8 Note Tune Player - schematic

# R1 controls the speed at which the notes are played. R3-R10 control the pitch of those notes. # The circuit will operate fine on a 9V battery, with the addition of a 7805 regulator to power the TTL logic used. # The missing pin on U2 is pin 14.



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