Ic 555 Timer Diagram. The block diagram of a 555 timer is shown in the above figure. 555 timers are very popular in electronics.
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It is a affordable stable and user friendly ic in application such as monostable and bi stable. A 555 timer has two comparators which are basically 2 op amps an r s flip flop two transistors and a resistive network. 8 power or vcc pin 1.
To initiate the timing cycle s1 is pressed momentarily.
It is connected to ground as usual. Resistive network consists of three equal resistors and acts as a voltage divider. In this 5th ic 555 timer diagram we can see that the relay contacts are joined in parallel with the start switch s1 which are both in the normally open mode and ensures there s no current drain while the circuit is off. The 556 timer ic has 2 timing circuits dual timer while the 558 timer ic has a total of 4 timing circuits.
