NE555 Timer
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Monostable Mode
Astable Mode
Monostable Mode
T
- Output Pulse
R
1
should be in range of 1KΩ to 1MΩ
Astable Mode
Duty
= High Period ÷ Total Period × 100
R
1
and
R
2
should be between 1KΩ and 10MΩ It is not possible to have
Duty
< 50% with this circuit
R =
Ω
C =
µF
T =
s
R1 =
Ω
R2 =
Ω
C =
µF
f =
Hz
Duty =
%