Thursday 19 January 2017

Why is this ground and resistor connected here after the switches?


I had recently asked a quiestion here: Will this circuit for quiz buzzers work? and I got this answer.



I am trying to understand the circuit and I have understood most of it but there is only one part that I am not able to understand.


enter image description here


I don't understand electronics in theory properly so can you explain in simple english why this ground and resistor have been connected?



Answer



Strictly speaking, they aren't required, but those resistors help speed up the turn-off of the associated transistors, and also help with noise immunity by pulling the base connections all the way to ground when the switches are open.


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