Astable multivibrator 555 timer frequency @TarunShrivastava

Uploaded September 2013 | Updated September 2026, 2 weeks ago

Tishitu explains
A multivibrator is an electronic circuit which is used to implement simple
two-state systems such as oscillators, timers and flip-flops.
The name "multivibrator" is because of its output waveform is rich in harmonics.
There are three types of multivibrator circuits depending on its circuit
operation and harmonics:
Here we are talking about astable multivibrator,
in which the circuit is not stable in either state. It continually switches
from one state to the other i.e. low to high and high to low.
We are generating astable wave with the use of 555 timer ic.
The name is because this ic has three 5k ohm resistor in series.
The 555 can be used to provide time delays, as an oscillator etc.
Our simulation tool is proteus which is a software for microprocessor simulation, schematic capture,
and printed circuit board (PCB) design.
The wave generated here is shown in oscilloscope.
GENERAL formulae for using 555 as astable multivibrator:
1. HIGH TIME =0.69(R1+R2)*C
2.LOW TIME = 0.69(R2)*C
3. DUTY CYCLE = HIGH TIME /(HIGH TIME + LOW TIME)
4.FREQUENCY = 1.44/(R1+2R2)*C)
5.TIME = 1/FREQUENCY

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Astable multivibrator 555 timer frequency

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