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School/College Quiz Buzzer Circuit Diagram using 555 Timer IC
8 candidate quiz buzzer using 8051 microcontroller (AT89C51)
School/College Quiz Buzzer Circuit Diagram using 555 Timer IC
Forums / 8051 Discussion Forum / Buzzer Interfacing with P89V51RD2
transistors - Will this circuit for quiz buzzers work? - Electrical
8 candidate quiz buzzer using 8051 microcontroller (AT89C51)
Quiz Buzzer Circuit for Eight players using IC 74LS373 | EE Project
Quiz Buzzer Circuit using 555 Timer IC - YouTube