Waching daily Oct 2 2017

Hi, guys welcome to electrical projects channel, and in today's video, I'll show you how

to build very simple security alarm system that uses lasers.

You've probably have seen such security devices many times in the different movies,

And that is what I am going to build today.

Let's have a look at what we components we need for making such alarm system.

The main component, of course, is a cheap laser pointer.

Also, we'll need two MOSFET transistors 2N7000, an active buzzer, a Light dependent

resistor LDR07, a button for reset, an LED for indication and two resistors, one of which

is 1K Ohms resistor and the second 470 Ohms.

Also we'll need wires.

For the powering, I'll use a 5V power supply.

Let's start making this device.

On the left side, you can see the schematic, as you can see it is really simple.

Well, let's start building.

First, let's disassemble this laser pointer

and let's solder two wires that will power the laser.

Let solder the negative wire to the resistor,

like this…

and the second wire I will connect to the housing of this laser pointer.

Now let's check that this laser still works.

Let's connect the power supply and do a test.

Good sign, the laser survived my soldering which means that we can continue building

our security system.

Ok let's continue, First, I am going to

solder two wires to this button.

Now let's solder a 1k resistor between the gate lead and the source lead of the MOSFET.

Now let's connect the button in parallel to the Light dependent resistor.

Now let's solder the button with the light dependent resistor to the gate lead of the MOSFET.

Now let's connect the negative wire from the laser to the drain lead of the MOSFET,

And let's connect the positive wire from the laser to the button with the light dependent resistor,

Okey,

Now let's connect a black and a red wire that will be connected to power supply later.

We need to connect the black wire to the source lead of the MOSFET.

And the red wire we need to connect to the yellow wire that powers the laser

Now let's do a quick test.

To do a test let's connect what we've built to the power source.

Now when you press the button the laser turns on, and when you release the button the laser

turns off.

Well, nothing special here, but It becomes much more interesting when I point the laser

at the light dependent resistor.

Now when I press the button the laser stays on, it stays on until I block the light.

Pretty cool, isn't it?

As you can see this part of the circuit works well and when I block the light from laser

it triggers our security system, but so far we don't have any buzzer to indicate that.

So let's build the remaining part of the circuit.

First I am going to solder the LED and 470 Ohms resistor sequentially.

Now let's connect the LED and resistor to the buzzer.

Now let's solder the drain lead of the transistor Q2 to the minus lead of the buzzer and to

the cathode lead of the LED.

Ok, now let's solder the plus lead of the buzzer to the positive red wire.

Now let solder the source lead of the transistor Q2 to the negative black wire.

And last what we need to solder is the gate lead of the transistor Q2 to the Drain lead

of the transistor Q1.

Ok, this device is ready to let's test it.

Let's connect everything to the power supply.

and let's plugin.

Ok, now let's press the button and let's point the laser at the light dependent resistor.

Ok, let's see how it works.

As you can see it works.

Pretty cool.

Now, I've pointed the laser at a mirror and the mirror reflects the light from the

laser right at the light dependent resistor.

Let's see how it works this time.

And that is all for today, I hope this video was interesting, is so then like it.

Also, you can subscribe to my channel so you don't miss any of my future videos.

And Thanks for watching!

For more infomation >> Laser Trip Wire Security System | Simple DIY Project - Duration: 6:04.

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Tattoo-The Most Important Things One Should Know Before Getting a Tattoo . - Duration: 6:20.

health beauty and weight loss channel

new york-based tattoo artist buck a roach from North Star tattoo who's

responsible for the unicorn tattoo on Lady Gaga's toy shares her insider tips

on the most important things one should know before getting a tattoo

hey there I'm dr. John and today I'm going to show you 12 before getting a

tattoo let's see 1 don't use Google or Pinterest when looking for a tattoo idea

unless you want your tattoo to look like everyone else's so many feather tattoo

it would be getting a tattoo for the first time would be to do your research

check out ice online most artists have an online portfolio these days and when

you would like to book in your tattoo if you feel like this person's artwork is

the right person to you go to the shop go and check things out and make sure

you're happy with the surroundings make sure you're comfortable with who's

testing you make sure your eyes is working in a reputable shop any

reputable shop will have to have a license which is given to you by your

local council they legally have to have their license displayed on-site for the

whole entire shop and for each individual eyes that works in the shop

most likely that the shop license will be on display inside the studio or in

the waiting room - instead scour Instagram for inspiration or to help you

find an artist I'd like to use most tattoo artists use their Instagram feeds

as portfolios to showcase their recent work and the pieces they're most proud

of if you find an artist you're really drawn to but don't know what to get

reach out to them and ask for their input

many tattoo artists have tons of designs they've created on the site and are

dying to tattoo on people also renal reviews customers don't hold back on

those good or bad three if you're allergic to a particular lipstick or

eyeshadow you might also get an allergic reaction from Akkad to sometimes that

I'm subscribe to ink are a certain makeup formulas if you've had a reaction

to and eyeshadow pigment in the past to have your dermatologist run some tests

beforehand to see what kinds of ink you should avoid for the most famous artists

other waiting lists are well-known tattoo artists could have a waiting list

up to a year or longer if you're obsessed with the artist then wait

otherwise find a more low-key artist who is just as talented you'll also save

quite a bit of money that way 5 unlike at most places of business

a tattoo artist doesn't have to help you if they don't want they can and will

send a customer away based on grounds as simple as bad vibes they do enough

business that they can choose whom they want to work with six a good tattoo is a

cheap and a cheap tattoo is good the price of a tattoo depends on the size

area of the body you want covered and the artist but typically a good tattoo

will cost you anywhere from $50 for a tiny design to a few months rent for

more elaborate art 7 prices are non-negotiable and you really can't

bargain with a tattoo artist on the set price he or she charges for a tattoo

just like how you can't bargain with the salesperson at Bloomingdales 8 visit the

shop before you go get your tattoo check that duck place looks clean they have

good artwork on the walls the staff is friendly and then schedule a

consultation with the artist to talk about pricing and any questions you

might have you can and should also ask to see the artist State tattoo license

to make sure he or she has completed the necessary safety course on blood-borne

pathogens that is hiv/aids hepatitis etc 9 a good tattoo comes out of good

communication don't be shy most two ideas are a collaboration between the

customer and the artist let the artist know what aspects of the tattoo you're

not willing to change and where you're flexible just like a haircut if you

don't speak up you'll get something you didn't want but unlike a bad haircut a

tattoo doesn't throw out 10 if you're getting a tattoo with words proofread no

get to wrap up and looking at a tattoo as a whole and forget to pay attention

to the tail you and the tattoo artist will probably make a few edits during

the sketching and stenciling process so make sure you spell check after each

round of edits no one wants to be a blocking type of 11 your ribs feet and

butt will hurt the most so if you were planning on getting all three of those

areas tattooed maybe you should reconsider or bring along some Advil

could take out here appointment taking it before will fan your blood and

possibly make you bleed more during the process 12 designs on your hands and

feet will pay the fastest the skin regenerates more quickly on your hands

and feet because you use them so much during the day so the ink isn't last as

long keep that in mind before you lay down a few hundred bucks thank you for

loving for more video don't forget to subscribe now