555 simple electronic keyboard circuit (2)

Published:2011/6/15 19:24:00 Author:TaoXi | Keyword: 555, simple, electronic keyboard | From:SeekIC

As the figure 14-41 shows, the multivibrator is composed of the 555 and some capacitance resistance components, the oscillation frequency depends on the values of Ra, R16 and C3. f=1.44/(Ra+2R16)C3, the Ra of the formula corresponds to the different values of R1-R15, this depends on the situation of the keys K1-K15. When you are debugging the notes, you can use a 100kΩ potentiometer to debug repeatedly, and confirm every note's corresponding resistance. This circuit uses the bipolar type 555, this 555 can drive the speaker directly.



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