ITEM NAME:16 Board 16-Tone Electronic Module DIY Kit Parts Components SolderingS Hn Features: The sixteen-tone box can emit 16 interesting analog sound effects at will under your control. It is not only an electronic toy, but also a doorbell or alarm. Parameter: Supply voltage: DC 4.5V-5V Board size: 4.8*4.1cm Control method: manual coding + external coding Circuit principle: Whole circuit with a 9561 tones of integrated circuits as the core, with four binary code to encode 9561 working.The binary encoder circuit, the switch S1 - S4, resistance R6 - R9 etc binary encoder. S1, S2, S3, S4, corresponding binary digital A, B, C, D four. Switch to stir to 0, switch to stir to 1. Circuit principle.
