In the next stage, there are two comparators. The voltage divider is consists of three similar 5k resistors which makes two reference voltages at 1/3 and 2/3 of input voltage ranging from 5 to 15V. Its block diagram consists of 2 comparators, one flip-flop, a voltage divider, a discharge transistor, and an output stage. The internal structure of the 555 Timer ICĥ55 Timer is consists of 25 transistors, 2 diodes, and 15 resistors. You can download datasheet of 555 timer from here To understand the working of 555 timer let’s take a look inside this IC. The 555 Timer has three astable, monostable and bistable mode. It is used to produce time delay and a square wave of a wide range of frequencies. It can be found wast variety of electronic devices. The 555 Timer was designed by Hans Camenzind in 1971.
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