If the voltage at the negative terminal is higher than the voltage at the positive terminal, the comparator output will be 0(low). If the input voltage at the positive terminal is higher than the input voltage at the negative terminal it will give 1(High) output. It compares two analog input voltages at its positive (non-inverting) and negative (inverting) input terminal. 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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