Fritzing

Generating pulses with the 555 Timer IC

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Experiment with IC Timer 555 shows a simple pulse generator.

For R117=R116 you can use:

f=1/1.4 * C112 * R116

For detail signal pulse pause differentiation use: f= 1/(timpulse + tpause)= 1/( ti + tp )

ti= 0.7 * C112 * R117 tp=0.7 * C112 * R116

More Details see Fritzing project.