555 Timer Analysis

555 Astable Multivibrator (Free-Running Oscillator)

About this Activity

The purpose of this activity is to hone your skills and test your ability to analyze the operation of a typical astable (free-running) multivbrator circuit.

You are given some pertenent values and asked to solve for others.

See the Legend if you need any help with the definition of terms used in this activity.

Instructions

Solve the problem on a separate sheet of paper.

Click the Hint button if you need some help getting started.
Click the Solution button to see the correct solution.
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Given:

R₁ = 272.9 W
R₂ = 290 W
C = 103.7 nF

Find:

f, t_H, t_L, D

Solution:

f = 16.1 kHz
t_H = 40.8 ms
t_L = 21.0 ms
D = 66%

Hint:

t_H = 0.7C(R₁ + R₂)
t_L = 0.7CR₂

Legend

C = value of the timing capacitor C in farads
R₁ = value of the upper timing resistor in ohms
R₂ = value of the lower timing resistor in ohms
f = frequency of the output waveform in hertz
t_H = HIGH interval of the output waveform in seconds
t_L = LOW interval of the output waveform in seconds
D = duty cycle of the output waveform in percent

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Content Provider: David L. Heiserman
Publisher: SweetHaven Publishing Services

0 --

1 --Monostable, given R, C, determine tH

2 --Monostable, given R, tH, find C

3 -- Monostable, given C, tH, find R

4 -- Monostable, ***

5 -- Astable, given R1, R2, C determine tH, tL, f

6 --