Description: 

The scale of this circuit can produce different sounds, and different keys correspond to different scales. The electronic keyboard is played by pressing different keys with fingers to produce different scales.
The principle is that the circuit NE555 is connected to an oscillator, and its oscillation frequency It is determined by the resistance of the circuit (R1-R8), so that different keys can produce different sounds.
The advantages of this circuit production: simple and practical, low power consumption, and the circuit is driven by integrated circuits, with few parts, and the circuit is simple and easy to understand, which allows us to deepen our understanding of circuit principles du the debugging process.
Resistors R1-R8 are the choice of oscillation frequency. They and resistor R1, capacitor C2 and NE555 constitute 9 different oscillation frequencies. The frequency selection signal is controlled by the S1-S8 key switch, and the NE555 audio output will emit a loud sound on the speaker SP. Du operation, press the keys and the keyboard will emit a continuous loud sound. If you press different switches in sequence, you can try out different music.
colour:blue
material: ABS
size: 135mm x 22mm (Approimate)
Package Contents:
1 x NE555 Piano Keyboard kit

Please note: Colour may vary from the photographs.

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