light sensing circuit..................

[NARENDRA1234]

while designing light sensing circuit consisting of LED and photo transistor L14g2 ,
is it really necessary to connect capacitor to VCC part for noise reduction?what is its importance?what if we dont connect it?

 

[hamidmoallemi]

the capacitor is for filtering
when you don't connect proper capacitance on your supply any noise or fluctuations on power supply can affect your circuit
especially when you use A/D and microcontroller

 

[miskol]

the capacitor helps in reducing spike voltages that might harm your components. it is recommended to place the capacitors near to the sources.