5 Tones Electronic Piano Using 555 Timer

This post presents circuit of an electronic piano which produces 5 tones. Circuit consists of the 5 push-buttons and when one of them is pressed, it produces the different tone through the speaker. Circuit is based on 555 timer which operates in astable mode. In this mode output is generated in the form of a square wave.


1.Power supply (9V) 1
2.555 timer1
3.8Ω speaker1
4.1kΩ resistor5
5.5.1kΩ resistor1
6.10μF electrolytic capacitor1
7.10nF ceramic capacitor1
8.100nF ceramic capacitor1
9.Momentary push-button switch5

Circuit diagram

The frequency of the tones is affected by values of C1 capacitor and all the resistors (R1-R6) in the circuit.

5 Tones Electronic Piano Using 555 Timer (Circuit Diagram)

Designed circuit

Circuit is designed on a breadboard.

5 Tones Electronic Piano Using 555 Timer (Designed Circuit)

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