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

Thomas Ryan: @Legolas11007 you can fix the little sound when the alrm is not on by puting a low ohm resistor infront of the beeper that how I fixed it... :) bye

Afrotechmods: Well done! I like how it has reset functionality.

Thomas Ryan: @ramicaza thanks :D

Thomas Ryan: @bugdann It sound like you may have too mutch current running through the ic, try building it again, but be carefull you may burn out the ic.

Thomas Ryan: @composerforfilm If you can't see the ones in the vid then how are you going to see them better if I send you them?!?!

Legolas11007: @Flea5000000000 Idea sounds good. Do I put the resistor between the 0 Volt rail and the alarm or between the alarm and the emitter of the transistor? And what sort of resistor will I be looking for? 20 ohm, 30ohm?

Thomas Ryan: @composerforfilm and they are verry clear.

Thomas Ryan: @Legolas11007 good idea ya that could work

mohits9: @Flea5000000000 thnx for quick reply... i wil ask again if any problem comes...

Thomas Ryan: :D please comment

Thomas Ryan: @michal3ek nope.... try to just put the url from the adress bar.

Fraw Tan: Hello Flea500000000!...Nice project you have!.. I've tried building the circuit you have shown and it was successful!.. but i have a small problem regarding with siren there is a little sound coming from it even the laser is shining on the photoresistor although it function normally once the beam is broken it produces a loud sound.. Will you please help me to solve the problem?...=( Thanks in advance...Hoping for your reply...

Thomas Ryan: @mohits9 hey, first the 741ic is comparing the input of the LDR and the resistors. When the LDR's output gos under the resistance level the 741ic outputs HIGH, wich makes the 4017 switch to output pin 1 so it is no longer supplying power to the LDR. Then when you press the reset button it switches the 4017 output to pin 0, wich resets the process (requiring that the LDR has the lazer on it at the moment of reset). Hoped this helped.

Filip Grmšek: Hi! I like ynur project. Can you please send me the shematic, and the list of components. e-mail: filip.g@vip.hr thanks!

Thomas Ryan: @ejatlah XD

Thomas Ryan: @bellerve201 sorry I don't know but you don't need the trasistor it just boosts power to the buzzer

Fraw Tan: By the way Flea500000000 I used 2N3904 transistor..is that would be fine?.. What transistor did you use with that project?..=)

kumon21: Hi there Flea, I tried making this circuit from your schematic but i couldnt get it to work. Could you make a step by step video or pics to show how you connected the components. Also could you please re-check your schematic as i think there might be a few errors. i.e. the clock input on 4017 (pin 14) is connected directly to the output of buzzer/transistor. But main point is the step by step expanation video as I think most of us are waiting to make one of your project ourselfs.

Alex Hand: instead of a 4017 you cout use a 4013 or two nor gates to make a SR latch.

Fraw Tan: @Flea5000000000 i tried this idea but it changes the quality of sound that the buzzer produces as the beam is broken..=(

Thomas Ryan: @TheLastGambino ok and ya sorry it was out of focus.....

kumon21: Hey thanks for your reply, just a question, why is the pin 4 on he 4017 IC connected so strangely. And I tried to connect it up but the buzzer just goes and the laser does not stop it. Could you please help and I will surely ask you some more questions later on. Is that alright with you ???

TheLastGambino: hey mate where's that laser alarm redo?

Fraw Tan: @Flea5000000000 Hello!..I just wanna ask if that's normal with the circuit to produce that little sound coming from the buzzer?...Did you also experience the same problem while building the circuit?..

mohits9: can anyone tell me that what happening in the circuit?? I want the explanation of circuit.

Ethan McNamara: How old are you???

Legolas11007: At how much Voltage does your Piezo buzzer operate?

Thomas Ryan: @besanher I'm makein a video that shows you how to put it all together.

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.

Thomas Ryan: @kumon21 and sorry I can't do a vid right now because my camra broke and I have to wate for it to be fixed

Legolas11007: is it the 10k resistor that is attached to the non inverting input or the 2 330ohm resistors attached to the 10k resistor I have to change? And would you put in a bigger or smaller resistor?

mohits9: @Flea5000000000 thnx for quick reply... i wil ask again if any problem comes...

Thomas Ryan: @Frawtan yes thats normal it happened to me while I was building the circuit

kumon21: Hi there flea5000, I tried making the project from your schematic but i couldnt get it to work. Could you please make up a step by step video or pics to how did you join up the components. Thanks. Oh and also why did you connect the clock input on 4017 decade counter (Pin 14) directly to the output of the buzzer ???

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

Thomas Ryan: :D :D

Legolas11007: @Flea5000000000 Cant you jst replace the 10k resistor attached to the + with a potentiometer?

Fraw Tan: Thumbs up sir!..=) Nice job!..

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..

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.

tradecycles: what is ldr? always write a description

ejat lah: anyone know what type of transistor in this video.please help me

walid fouad: @Flea5000000000 Could you send the schema to me? please!!! eng.walidfouad@yahoo.com

Christian Villanueva: schematik please

mohits9: thankyou very much...

Fraw Tan: Nice Job!...Thumbs up!..=)

bellerve201: 1. What type of transistor? Thanks!

Thomas Ryan: @michal3ek The schmatic that I would send you would be the same in the video... The transistor I do not know the name but as long as it will let current through when the base has a voltage of over 1v its fine. Yes you could use a potentiometer in place of the 10k going from the two 360 ohm resistors to pin 3 on the 741 ic.
Rating:
How to make a Reset-able Laser Alarm with a 741 op amp and a 4017 timer 4.6 out of 5

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