555 Timer

Astable & Monostable

OPERATING MODE

Resistor 1 (R1)

Resistor 2 (R2)

Capacitor (C1)

Time T

Frequency ($f$)

0.00 Hz

Duty Cycle

0.0 %

Time High ($T_H$) 0.0 ms

Time Low ($T_L$) 0.0 ms

Output Pulse Time ($T$)

0.00 s

Time the output stays HIGH after a trigger pulse.

Math & Theory

Astable Mode:

$T_{high} = 0.693 \times (R_1 + R_2) \times C$

$T_{low} = 0.693 \times R_2 \times C$

$Frequency = \frac{1.44}{(R_1 + 2 \times R_2) \times C}$

Monostable Mode:

$T_{pulse} = 1.1 \times R_1 \times C$