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Toy Organ

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.
Circuit diagram

Circuit diagram

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

Tags: 555, audio circuit, tone control circuit,

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