Quiz Buzzer

This project is an electronic quiz buzzer that is affordable by the colleges and even individuals. This project is useful for a 4-team quiz contest, although it can be modified for more number of teams. This system is sensitive. The circuit can detect and record the first hit contestant among all the contestants that may appear to be simultaneous.

The circuit uses IC 555 and a few passive components that are readily available in the market.

• Resistors: 470 ×4, 1k ×2, 10k ×8

• 555 timer ICs (such as NE555) ×4
• capacitors: 0.1μF ×4, 1μF radial

• 8-pin DIL sockets for ICs ×4
• diodes: 1N4148 ×4

• on/off switch
• battery clip for 9V PP3

• push-switch ×5
• bleeper suitable for 3 to 6V

• LEDs: 1 each red, green, yellow, blue, all 5mm
• stripboard: 10 rows × 50 holes

• 2-core cable.

Download PDF :-

http://hotfile.com/dl/51772065/5b0aacb/Rishuploadz_quiz_buzzer.pdf.html