Monostable mode 555 timer, also called a one shot, responds to a brief low trigger voltage by giving a single high output for a period of time set by the values of the timing capacitor and it’s resistor. The output then drops back low and stays there until triggered again. It’s got one stable state (low), so it is called monostable.

Diagram

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Video

Briefly pressing the button lights the LED for a period of time set by the capacitor and it’s charging resistor.

Quick 555 timer monostable one shot mode lighting an LED circuit schematic to breadboard build



Other basic 555 circuits:

Brief 555 bistable mode flip flop alternating LEDs circuit

Brief 555 timer astable multivibrator mode circuit

Brief 555 Schmitt trigger logic inverter

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