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Astable Multivibrators are working and designing using 555 timer ICs and it is do ne by using Op-Amps and transistors. This timer IC can afford exact time delays from milli-seconds to hours. The operational frequency or oscillating frequency can be measured manually by modifications. This timer IC is cheaper in market, small in size, stable, user-friendly IC and also is nearly suitable for both astable and mono-stable applications.
There are two kinds of 555 timer ICs are available in current market and they are NE555 and SE555. Astable multivibrator is using to generate continuous pulses. The frequencies of the circuit can be controlled by changing values of resistors R1, R2 and capacitor C1.
Capacitor 10 uF
Variable resistor 100KΩ