What is the purpose resistors and capacitor in this 555 circuit


Posted on Feb 5, 2014

It`s a typical AMV (Astable MultiVibrator) setup. The capacitor gets charged through both resistors until 2/3 Vcc is reached (internal comparator level). This sets a flip-flop which activates the Discharge output (DIS). Through DIS and the potentiometer, the capacitor is discharged until the voltage on the Trigger input (TRI) is 1/3 Vcc, which resets the flip-flop


What is the purpose resistors and capacitor in this 555 circuit
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and switches off DIS, so that a new charging cycle starts. So the capacitor voltage swings between 1/3 Vcc and 2/3 Vcc, and each time one of the limits is reached the output toggles. It`s worth it to study the 555 block diagram and its typical applications, like this AMV or the MMV (Monostable MultiVibrator). The 555 is one of the most versatile ICs around.




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