555 Circuits Part 1 - The 555 Timer Astable Oscillator
Software_555_timer_calculator_Astable_Monostable Download Software 555 Timer Calculator Astable And Monostable, Time, Resistor, Capacitor, And Frequency Calculator - Xtronic.org
555 Timer Calculator
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