How To Make A Reset-able Laser Alarm With A 741 Op Amp And A 4017 Timer




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Did this video help you?

Louie Salvador: i tried your circuit but the problem is that the reset button is not function, yes buzzer stops but its not continues, please help, thanks! :)

Nikola Miodragovic: which transistor you used

Bablu Dhiman: sir, will you please send me the schematic diagram of this. because the circuit diagram is not cleared from the video. and which transistor you have used in making this circuit. my email id is babludhiman1@gmail.com

Ranidel Tecson: sir, can you send me the schematic diagram of this? because, the ones in your site doesnt work when I simulated it, i dont know why.. my email is lumologic@gmail.com

Lemuel Dueñas: what kind of transistor you used??

Simon Shrestha: can u send me the circuit diagram and circuit description @ cimon77@gmail.com

Thomas Ryan: Wow that was hard to read and yes I will post a new video showing an easier way to make the circuit and will be purchable on Jamaco(dot)com hopefully. You may have to wait a bit I'm just trying to get there reply and post a new vid, I will hopefull post a new one in less than 5 days.

Arunesh Lal: hii frns .. dis is aswm project .. i wana make dis project .. so pls can u send me circuit diagram and report .. m very thnkful to u for dis kindness..., my email id :- arush8arunesh@gmail.com

Wahab Qamar: @Flea5000000000 What transistor you used? 2N3904?

Ethan McNamara: How old are you???

robertkerri99: not staying on until reset pushed reset button does nothing either buzzer on with no light or off soon as light hits it. HELP..

robertkerri99: I think I messed up cant get buzzer to stay on unless light blocked what did I do wrong?

Prashant pandya: I also want to make a similar kind of system but the difference is that i want to start the buzzer when the laser strikes the sensor. I am a beginner and has no knowledge of circuits so can you please help me and mail me the circuit diagram and the list of things i should use?? My mail Id is p264_pandya@yahoo.com

Jhomar Buenaventura Pogi: can you tell what are components of your laser alarm, i have a project about security system thanks in advance:-)

Thomas Ryan: @tradecycles there is no need for a decription because if you are building this it is assumed that you know what the compents are, if you don't just post a comment.

Thomas Ryan: @tradecycles an LDR is a light dependent resistor that changes it's electrical resistance depending on how light or dark it is. The more light less resistance.

tradecycles: what is ldr? always write a description

Advantage12: Thanks for the video I just built this myself it works great thanks! Also pin 6 and 7 on the 741 look good to me... Mine wouldn't stop going off until I switched them back to the way you had them in the schematic you posted. Anyways thanks again!

Christian Villanueva: schematik please

Thomas Ryan: @ramicaza thanks :D
Rating:
How to make a Reset-able Laser Alarm with a 741 op amp and a 4017 timer 5 out of 5

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How to make a Reset-able Laser Alarm with a 741 op amp and a 4017 timer