One of the common rounds in the quizzes is the buzzer round. We are
describing here a simple electronic circuit that can be used in any
test or quiz competition. In this circuit, only four persons can
participate, and every participant is assigned a certain number.
Whenever a switch is pressed, the circuit locks the remaining three
entries. At the same time, an alarm sounds and the designated switch
number is displayed on the seven segment LED display.When a player
presses his switch, the corresponding output of IC1 goes high. Let us
suppose, when switch S1 is pressed, D1 input of IC1 goes low and its
corresponding output Q1 goes high. As a result, current passes through
D5 to piezo buzzer PZ1, which creates a beep. At the same time, current
also passes through diodes D6-D7 to show the number on the LED
display.
Simple Electronic Quiz Switch Circuit Diagram
Simple Electronic Quiz Switch Circuit Diagram
Similarly, when any other switch (S2-S4) is pressed, the corresponding number gets displayed on seven segment displaying DIS1 and buzzer sounds. Switch S5 is used to reset the display exclusively. Switch S5 is a push to on switch. The circuit is powered by 9V battery. Assemble the circuit on a general purpose PCB and enclose it in a suitable case along with seven segment display and piezo buzzer. The assembled circuit can be kept near the host and the switches connected through the external can be assigned to the players.
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