![]() The output of both the comparators is connected to the input of flip-flop to produce either a “High” or “Low” logic output based on the states of Input. The voltage difference is determined by the externally connected RC network. The two comparators produce an output voltage that depends upon the voltage difference at their input. This produces a voltage divider network at Pin 8 and Pin 1. There are three 5K ohm resistors connected together internally. Let’s see the internal circuitry of the 555 Timer IC to get a better idea of its working principle: 555 Timer IC can be mainly configured in three different states namely A-Stable multi-vibrator, Mono-Stable multi-vibrator, and Bi-Stable multi-vibrator.
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