Pay
College Quiz Buzzer

College Quiz Buzzer

COM

IC1

7805

1

2

OUT

2

IN

+

F1

FUSE

0.5A

S9

ON/OFF

SWITCH

230V AC

50HZ

X1 = 230V AC PROMARY TO 7.5V,

500mA SECONDARY TRAMSFORMER

X1

BR1

1A

BR1 = 1A BRIDGE RECTIFIER

A

C2

0.1μ

B

C1

1000μ

25V

School/College Quiz Buzzer

5
0
0
publish time: 2020-09-29
Circuit Everyday

In schools and universities, if the answering device used for knowledge contest is not well designed, it will cause a certain degree of confusion. Although there are circuits that use PCs and discrete ICs, they are either too expensive or limited to low-volume players.

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