Fastest Finger Press Quiz Buzzer

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Model No: 222 Manual buzzers used for quiz competitions in schools and colleges create a lot of confusion i...
Model No: 222 Manual buzzers used for quiz competitions in schools and colleges create a lot of confusion in identifying the first respondent. This circuit includes 8 number of push Buttons which are fed to a D-type flip-flop which generates o/p signal fed to transistor, making the corresponding LED to be ‘ON’ after a particular competitor has pressed the pushbutton with a buzzer. The power supply consists of a step down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the IC & other components. For more details visit www.efxkits**** or www.facebook****/edgefx
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