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Pulse and Digital Circuits by Manmadha Rao G., Rama Sudha K., Venkata Rao K.

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16.3 555 TIMER APPLICATIONS

The 555 timer is another linear IC. The functional block diagram of a 555 timer is given in Fig. 16.13(a) and the pin diagram of a 555 timer is shown in Fig. 16.13(b). A 555 timer consists of:

  1. A potential divider network comprising R1, R2 and R3
  2. Two voltage comparators
  3. An R–S flip-flop
  4. An inverting buffer output stage
  5. Two transistors, Q1 and Q2
FIGURE 16.12(b) A bootstrap sweep generator using an op-amp voltage follower

FIGURE 16.12(b) A bootstrap sweep generator using an op-amp voltage follower

FIGURE 16.13(a) The functional block diagram of a 555 timer; and (b) The pin diagram of a 555 timer

FIGURE 16.13(a) The functional block diagram of a 555 timer; and (b) The pin diagram of a 555 ...

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