555 timer calculator
calculate frequency, duty cycle and timing for 555 timer circuits in astable and monostable modes.
astable mode generates a continuous square wave. frequency and duty cycle are set by R1, R2 and C.
R1
R2
C
frequency480 Hz
period2.079 ms
duty cycle66.67%
time high1.386 ms
time low693 µs
duty cycle
0%50%100%
pin reference
1GND
2trigger
3output
4reset (active low)
5control voltage
6threshold
7discharge
8VCC