555 Timer Download: Compute resistor and capacitor values for 555 timer integrated circuits based on user-defined parameters with the help of this electronics utility
555 Timer Online Calculator | ee-diary
How do you calculate the frequency and duty cycle of a 555 timer circuit?
Online 555 timer calulator - Astable component and frequency calculator
555 (NE555) Astable Circuit Calculator
Software_555_timer_calculator_Astable_Monostable Download Software 555 Timer Calculator Astable And Monostable, Time, Resistor, Capacitor, And Frequency Calculator - Xtronic.org