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... :)
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
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: firstname.lastname@example.org 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?..=)
Dragan babić: hey i found somewhere similar thing but the buzzer make noise only when i
break the beam.so i am beginer and i like your videos. i don't know some
parts.i would like to send you an email or you could send to me so i can
explain what is my problem. I am gago. Thanx. My email is email@example.com
reviathon360: 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.....
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?..
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
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?
Thomas Ryan: @Frawtan yes thats normal it happened to me while I was building the circuit
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 firstname.lastname@example.org
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!..
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.
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!!!
Christian Villanueva: schematik please
Fraw Tan: Nice Job!...Thumbs up!..=)
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.
Thomas Ryan: @thunda828 sorry I'v been busy but I will put a tutorial on it
Thomas Ryan: @composerforfilm The pictures in the video are what I will send you.....
Lemuel Dueñas: what kind of transistor you used??
ejat lah: is it 547 transistor?
ramicaza: why so complicated? just use a scr lol i have a tutorial on my channel for
my version. Ur a genius btw
Filip Grmšek: Hi, again me! You didn't write what is the name of transistor you use in
project! So, please tell me! Tnx!
Thomas Ryan: Sorry, my camra is brocken. It will probaly be fixed with in the next two
ejat lah: @Flea5000000000 THANK YOU (that was not suppost to be in caps ;p)
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.
Thomas Ryan: @michal3ek The LDR may be your problem as the 741ic is comparing the input
of the LDR and the resistors. When the LDR's output gos under the
resistance level the ic outputs HIGH (9V). To try and fix this (if it is
the problem) then try putting a 10k potentiometer in place of the 10k going
from the two 360 ohm resistors to pin 3 on the 741 ic. Then test different
resistance levels with the potentiometer. Hoped this helped.
Simon Shrestha: can u send me the circuit diagram and circuit description @
Legolas11007: and of the transisor aswell please, thank you
Thomas Ryan: @ficho9999 dude! the schemattic is in the vid and the components I explane,
THAT IS THE ENTIRE REASON I DO THAT, SO YOU DON'T HAVE TO ASK FOR THE
SCHMATIC OR COMPONENTS!!!!!!!!!!!!!!!!!!!
How to make a Reset-able Laser Alarm with a 741 op amp and a 4017 timer4.6
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