Basic 555 timer monostable one shot mode circuit

Monostable mode of the 555 time is where the output is stable (held low), until you give a negative pulse to the trigger of the 555 timer. This causes the output to flip to high for a period of time set by a capacitor and resistor. After that period of time, the output returns to the low where it stays until triggered again. 

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Primary circuit

Video below: 555 timer monostable multivibrator one shot circuit controlled by push button switch demo explained Click here to watch directly on YouTube!

555 timer monostable multivibrator mode push button controlled one shot circuit diagram by electronzap electronzapdotcom
555 timer monostable multivibrator mode push button controlled one shot circuit diagram by electronzap electronzapdotcom

Modified circuits

Using a light dependent resistor, the monostable 555 timer circuit can be triggered by light level. The light dependent resistor (LDR)and a fixed resistor makes a light variable voltage divider. The video below can be watched by clicking this link Light dependent resistor LDR replacing push button switch for 555 timer monostable circuit .


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