555 electronic musical instrument additional combo audio circuit

Published:2011/6/15 4:22:00 Author:TaoXi | Keyword: 555, electronic musical instrument, additional, combo audio circuit | From:SeekIC

If we add this combo audio circuit (as the figure 14-38 shows) to the automatic rhythm generator of the electronic musical instruments, we can meet the the requirements of players to add the combo audio of drum and cymbals to make the performance effect more perfect. As the figure shows, the astable multivibrator is composed of the 555 and R1, RP1, R2, C1, the oscillation period T=0.693(R1+RP1+2R2)C1, the oscillation period sound effects are adjustable. If you press different K(K1~K7), you can get the corresponding combo sound. By adjusting RP1, you can change the frequency of the combo sound.



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