555 Timer

The 555 timer is an integrated circuit that can be used as a timer, oscillator, or flip-flop.

It was introduced by Signetics Corporation in 1971 and has since become one of the most popular and versatile electronic components.

Here are some of the basic applications of the 555 timer

1. Astable multivibrator: This is the most common mode of operation for the 555 timer. In this mode, the 555 timer functions as an oscillator that produces a square wave output with a frequency and duty cycle that can be adjusted using external resistors and capacitors.
2. Monostable multivibrator: In this mode, the 555 timer functions as a one-shot pulse generator. When triggered, it produces a single output pulse with a duration that can be adjusted using external resistors and capacitors.
3. Bistable multivibrator: In this mode, the 555 timer functions as a flip-flop that can be set and reset using external triggers. This mode is commonly used for controlling digital circuits or for generating square waves with a fixed frequency.