“This is one of the most basic 555 circuits. This circuit is part of this chips datasheet, complete with the math needed to design to specification, and is one of the reasons a 555 is referred to as a timer. This is a monostable circuit, one of the most basic 555 circuits; it has two distinct states, one of them stable (having a steady voltage) and the other one unstable (having an unsteady or variable voltage). Normally, the circuit is in the stable condition. The circuit can be removed from the stable condition temporarily by an input pulse called a triggering signal. After a certain period of time, which can be adjusted or set by choosing specific component values.”
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