Eight-note Keyboard, Electrical And Electronic Production Kit $ 4.43 Product information: Power supply: DC3-12V Circuit board size: length 13.5CM*width 2.2CM Specifications: Kit (without battery box) product manual: 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 original The reason is that the circuit IC555 is connected as an oscillator, and its frequency of oscillation is determined by the circuits electrical The resistance (R1-R10) is determined by the resistance value, so that different keys can produce different sounds. Package Content Packing list: Kit x1
