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Description

Adding a second resistor Rb to the 555timerand connecting the trigger input to the threshold input causesthetimer to self-trigger and run as a multivibrator. The capacitorCwill charge through Ra & Rb and discharge through Rb only.Theduty cycle can be controlled by changing the values of Ra andRb.Input Ra, Rb (in kOhms) & C (in uFarads) then pushtheCalculate button to get the values for the outputhigh-levelduration tH and low-level duration tL and frequency.Output driverand output waveform duty cycles are alsodetermined.