555 Timer Flashcards
(9 cards)
1
Q
What is Duty Cycle?
A
Time ON / (Total Time) x 100
Total time = Time ON + Time OFF
2
Q
Mark to space ratio?
A
Time ON / Time OFF
3
Q
Time for Output is high is when C1 charges from Vcc/3 to 2/3 Vcc. What is the equation for this?
A
T(HIGH) = 0.7(R1+R2)C1
4
Q
Time for Output Low is time taken for C1 to discharge from 2/3Vcc to 1/3 Vcc. Equation for this?
A
T(LOW) = 0.7R2C1
5
Q
Equation for time period of waveform?
A
T(HIGH) + T(LOW)
OR
0.7(R1+2R2)C1
6
Q
Equation for Duty cycle with resistors?
A
T(HIGH) / (Time HIGH + Time LOW)
SO….
(R1+R2)/(R1+2R2) x 100%
7
Q
What is the frequency of oscillation?
A
1.44 / ((R1+2R2)(C1))
8
Q
Equation of Pulse Width?
A
1.1(R1C1)
9
Q
Time delay equation for a 555 timer?
A
1.1Resistor valueCapacitor value = Time delay (seconds)
