The 555 timer has low cost and reliable performance. It only needs several external resistors and capacitors to realize pulse generation and conversion circuits such as multivibrator, monostable trigger and Schmitt trigger. It is also widely used as a timer in instrumentation, household appliances, electronic measurement and automatic control. The internal circuit block diagram of the 555 timer is shown on the right.
It consists of two voltage comparators, three equivalent series resistors, an RS flip-flop, a discharge tube T and a power output stage.
It consists of two voltage comparators, three equivalent series resistors, an RS flip-flop, a discharge tube T and a power output stage.
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