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Block Diagram of IC Timer 555 and Its Various Operating:


The block diagram of IC 555 is illustrated in Figure which may be utilized to explain its various modes of operation, as follows.

The several operating modes of the 555 timer may be explained as follows. Let + V = Vcc, - V = ground, now consider the following cases.

Case 1

When Vtr <1/3  Vcc, then C2 → High, which sets the FF resulting in V03 → HIGH.

Though, Q is low (≈ 0.2 volts for + 5 V supply) hence, Q0 is off and pin 7 behaves like an OPEN circuit.

144_Block Diagram of IC Timer.png

Figure: Block Diagram of IC Timer 555

Different cases
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