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|
|6.||10μF electrolytic capacitor||1|
|7.||10nF ceramic capacitor||1|
|8.||100nF ceramic capacitor||1|
|9.||Momentary push-button switch||5|
The frequency of the tones is affected by values of C1 capacitor and all the resistors (R1-R6) in the circuit.
Circuit is designed on a breadboard.