Make a four player Quiz buzzer circuit without microcontroller

In this video, I've explained how to make a Quiz Buzzer Circuit for Four players using D Flip-Flop IC 4013 and NOT gate IC 7408. In this, we do not need any kind of micro-controllers.

Quiz buzzer circuit for 8 Players, video link:

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[sabyasachi]

Thank you, brother. You helped a lot in my project.

[mufaddalsadiqali]

Hello. Can you explain how to use the 7474 IC instead of the 4013 IC? I cannot get the 4013 IC in my area. I used the 7474 IC instead and also changed all the pinouts accordingly but when I turn it on all the LEDs glow very lightly and none of the buttons seem to work.

[DanCrawford]

Are there issues with the the 4013 D Flip-Flop IC? I see some mentions of issues in the comments but I haven't found official documentation on it. I have tried making this circuit based on your design, can get the LEDs to light up, but have no control over the LEDs in the circuit with the buttons. They come on by themselves, sometimes a few stay on, some times they turn off, it all appears a bit random. Sometimes the reset button will work for LEDs 2 3, and 4. Some times it does not. I am powering the breadboards with only a 5V 3A power supply and have added a electrolytic capacitor (16V 100uF). Could this behavior be attributable to being underpowered? Or maybe the IC's I have are counterfeit or bad?

[vonbrian]

This project is perfect! Thank you sir!

By the way... Is it possible to make this to a 12 button/player? Thank you in advance

[arunachalamk]

Bro, I have a doubt, for my circuit the LED is glowing only when I press the switch, if I remove my hand from switch it stops...
What will be the problem bro
Help me bro..

[mahmudulhaque]

hey, i know to want to if i use 9v DC battery, is that going to make any problem ? And also, i am facing a problem that is every switch of led works even after after one specific switch pressed.

[piyushprajapati]

Hello sir ....i do this same process but my reset and other 4 switches are not working ....my power suppy is 9v what can i do now....pls suggest

[revathiparthasarathy]

can we extend the switch and separate it from the breadboard???

[someshmishra]

Sir I made the circuit but when I connect the 5v supply, all led glows .I am not able to find mistake. The circuit is also correct

[someshmishra]

Thank you very much sir, it is now working, my mistake. It's the best project and great and clear explanation.

[manmangy]

Dear Friend., This is the first time I am seeing a valuable video. All other videos are filled with horrible background music that will destroy our ear drums.Good Luck. I will watch all your videos peacefully. Please do not add any background music like others do. Instead your commentry is valuable and worth.

[KennethNicholson]

Great tutorial Brother. You made it all very clear, easy to follow, and even I understood how it all worked even though I am old, lol. Great job my friend, well done. Love from UK, Ken.

[NisarAhmed-nkvo]

Design a system having four users and a host Host will ask a question and a timer f 15 sec will get start. All the users will have a buzzer button to reply to that question. The moment any first user reply, counter will stop, and no other user can reply. A 7-segment display will show the i user number and a green led will gets on. If counter overflows and users failed to reply in the allocated duration, a red light will glow with a buzzer,

[samimakhter]

Hey brother can i extend this for 6 players?

[zainoorahmad]

My project is not working.I have checked all the connections they are fine.Can you help me in finding the mistake or can you give any link for its working explanation so that i can figure it out myself?

[taliqamuhib]

I found a couple of issues in my circuit ... can you help me out to fix...2 leds are working properly and 2 aren't..

[deejhaygallardo]

how much voltage is your power supply?

[dheerajvanmore]

Can you provide explanation for the working of this circuit?

[samuelong]

Are you using a 7408 AND gate ic or a 7404 NOT gate ic

[crieliocriel]

it did not work for me.. is it the problem with the IC??