Astable multivibrator calculator

This calculator helps you to compute the value of Output frequency, Capacitor, and Duty cycle in a 555 astable multivibrator.

This calculator needs at least three inputs to compute results. All the fields except the Duty Cycle can be used as input.

R_A & R_B: Input
C & F : Input/Output
D : Output

The resulting output from above calculator are approximate values. Refer to standard Resistor and Capacitor table to choose the right component for your design.

FORMULAS:

With given RA, RC and C values. Frequency and Duty cycle can be calculated using the below formula F = 1.44 / (( RA +2RB) C) D = ( RA + RB ) / ( RA + 2RB ) Using RA, RC and F values, Capacitance can be calculated using the below formula C = 1.44 / (( RA + 2RB ) F )