This calculator evaluates the performance of the generic
bipolar 555 timer chip in both monostable and astable modes. Please enter the component
values in the spaces provided, then click 'calculate' and the results will be displayed.
As a rule of thumb, it is best to choose
resistor values above 1K and below 1Meg. Large electrolytics should be avoided in favour
of large value R's to reduce power consumption and timing inaccuracies due to leakage.