NE555 Astable Multivibrator Frequency and Duty Cycle Calculator
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This calculator computes the resistors and
capacitors for a NE555 timer chip, which has been configured as a astable
multivibrator (oscillator), or square wave generator. Just enter in the
duty cycle and the frequency and the calculator will compute reasonable
values for the resistors and capacitors.
Note that the minimum duty
cycle is 50 percent, so if you need a smaller duty cycle you need to use
an inverter on the output.
Also the design equations of the timer are
just approximations that can be off by as much as 20% from the empirical
D= Duty Cycle= (RA+RB)/(RA+2*RB)
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