555 simple electronic keyboard circuit (2)


Posted on Feb 6, 2014

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..


555 simple electronic keyboard circuit (2)
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