Toy Organ

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This circuit produces a tone according to the button being pressed. Only 1 button can be pressed at a time, that's why it is called a monophonic organ. You can change the 1k resistors to produce a more-accurate scale.

Schemantic:

Toy Organ

Parts:
R1-4   1k Resistor
R5       4.7k Resistor
P1       10k Trimpot (Potentiometer)
S1-5   Switch
C1      100n Capacitor
C2      10 Electrolytic Capacitor
SP1    8Ohm Speaker
555    NE555
 
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