ElectroMagnetic Impulse Sensor

[100roberthenry]

you could probably do this using 1.5v battery and a joule thief circuit..... cool stuf though!

i'm looking for a circuit that will turn an electromagnet on and off at rapid intervals any ideas?..thanks.

[Ztuibyman]

@100roberthenry Perhaps a multivibrator circuit will do the job?

[100roberthenry]

@Ztuibyman thanks i'll look that up, i guess it just needs to have he power turning on and off to it eh?..

[Ztuibyman]

@100roberthenry A multivibrator circuit is an automatic on-off circuit that creates impulses with various frequencies and it's easy to build. When connecting a coil to it, though, I would recommend to use an additional power transistor like 2N3055 or something to prevent the circuit from frying because sudden change of current in a coil causes high voltage...

[KhaledHamalawy]

great job man , but one question please , how much of that magnetic field required to trigger the circuit ?

Thank you for posting

[Ztuibyman]

@KhaledHamalawy I can't give you an exact value in teslas but just to get the pic, a common household voltage adapter should trigger the transistor easily.

[199sabry]

mi dici la bobbina dove la posso comprare,? o come si fa quanto filo ci vuole e quanto deve essere grosso il filo di rame???

[199sabry]

coil quanto deve essere di metro ??? no quale questa bobbina dove la posso comprare

[chemicalbombgang]

dude can u help ? could u make a circuit digram plz i liked it sooo much palz plz plz plz :) hope u reply :)

[Ztuibyman]

@chemicalbombgang Hey, check this out: w w w.allaboutcircuits.co­m/vol_3/­chpt_4/5.html 

[chemicalbombgang]

@Ztuibyman thankyou very much :)

[LonelyWolfCore]

im not an electronic expert. but yeah. i got an question. even tho its a prototype wouldn't a real EMP fry the circuitry of that devise? because of the extreme amount of electromagnetic pulse charge passing trough it?

again. im not an expert in this stuff. I just wanna know if my theory is true.

[Ztuibyman]

@LonelyWolfCore Yea, it would, only the impulse has to be some terawatts of energy, like whats released when exploding a nuclear bomb; home appliances release relatively small amounts of electromagnetic radiation, therefore they won't fry it. Transistors are the most sensitive electronic details to EMPs.

[davidglynn7]

fums up if you fucking hate ticking clocks !!!!!!!

[orio2319]

Electromagnetic radiation is stuff like light, UV, x-rays, etc. What you have here does not sense these, but rather senses when a magnet is moved and induces current in the coil you have. Two different things.

[Ztuibyman]

@orio2319 Yup, i know that. Back then when i uploaded it i didn't tell the difference.

[adamsc5500]

wow...the clock ticking in the background drove me nuts!

[Ztuibyman]

@adamsc5500 Hehe, luckily we don't have that clock anymore

[drums4woodstock]

this is so cool.

[palla9696]

how does it work?

[Ztuibyman]

@MrAncientalien Magnet wire is actually better, mine is a relay solenoid

[DigGil1]

Hi, could you specify about the coil you used? I used a selenoid's coil and I guess that what's wrong with my device.

[Ztuibyman]

@DigGil1 I got the coil from an old relay, 250V, wire is 0.1 mm in diameter, (thousands?) of turns. Too little turns won't work. Make sure the wire is thin, because you're gonna need the volts, not the amps.

[CALDERONCASTELLANA]

RECREATIVO! MUY BUENO!

[HIENTHER]

hi! I like this video. and I would like make it but I havent transistor BC 517 so with one transistor other can I use

Thanks!

[Ztuibyman]

@HIENTHER You have to make sure you have a "Darlington pair" transistor (Check the Internet). It has 2x greater sensitivity. The main thing about this gadget is that the base of the transistor has to be very sensitive to voltage change. But then again - not too sensitive because this way the LED will always glow and so, it would be quite useless.

[HIENTHER]

@Ztuibyman

Thank! I have not BC 517 but I looking the BC547 I will make it. do you think I will sucess

[Ztuibyman]

@HIENTHER Sure, let's hope the best!

[DigGil1]

Between the the coil connectors, there are two soldered points. What are these for? Using the coil's core as some kind of ground plane?

[Ztuibyman]

@DigGil1 These are actually just for the copper clip that holds the coil's core in place. I soldered it to the PCB. Same is in the front of the device.

[94thts]

You could actually use this to send information over short distances, by using an electromagnet for transmitting and your device for receiving :)

[Groesbeek1994]

middle of the night :|

[superbri007]

Why 50R resistor, what would happen if you choose a lower or higher number?

[Ztuibyman]

It would only make the LED more brighter or more dimmer. But generally it won't change the sensitivity.

[pwnmaster92]

AHHH BIG WORDS

[TheYURACIK]

Классная штука!

[molinobeer]

i does this works? what's the principle behind?

[Ztuibyman]

to feel electromagnetic field

[molinobeer]

how did you make the coil?

[Ztuibyman]

The coil is simple to make; you need couple of meters if insulated copper wire and a steel rod.

[molinobeer]

ok, thanks!

[coolsciencetech]

can you send me your schematic for this?

Jlordman@gmail . com

[Ztuibyman]

If you had taken a close look you would have noticed it by yourself on 4:50

[salaysalay]

You can also use 3pcs. of transistor using only 2pcs. AA Batt. (3v) for low cost but same sensitivity.

[Ztuibyman]

yea, i guess

[tangnatalaga]

I made a device like this because I was gonna use it for coil gun. You just take an op amp, use a large resistor parallel with small value capacitor for feedback. Then ground the positive input, and use a large value resistor at the input. Resistor must be high value otherwise it would overcome the small voltage produced the coils.

[saracomm]

Try using a HALL EFFECT sensor in place of the coil for a better signal.

[Ztuibyman]

what is a hall effect sensor?

[JS106351]

A hall sensor is a type of transducer (sensor) that makes the voltage proportional to a magnetic field. There are many types available like ratiometric (linear) and hall switches (on and off) . Combined with a transistor it can be used with many projects like motors and magnetometers, for example.

[Ztuibyman]

cool, i didn't know that before...

[suupertramp]

so basically a hall sensor is a coil attached to an amplifier

[tangnatalaga]

Nope. A hall sensor is actually a semiconductor. All semiconductor senses magnetic field, but a hall sensor is designed for that purpose.

[tangnatalaga]

The purpose of this video is not about sensing magnet. Hall sensors are ready made device, and you dont really need a lot to make it work. Have you ever designed a circuit like this? It is not easy to amplify a few millivolt produce by these coils. I had to use several stages of amplification from the output of the OP amp.

[xato909]

HOW???

[Ztuibyman]

What exactly do you mean?

[xato909]

I wanted to know the plan of this !!!!!!!!

[Ztuibyman]

Well, its simple, actually, the impulse from the coil goes to the transistor's base and the transistor amplifies the signal through the collector. The led is between the collector and battery +. The - end of the battery goes to the emitter which continues to the coil.

[tangnatalaga]

You take an op amp. Ground the positive input. Then connect its output to the negative input with a very small value capacitor(around a few nanofarad) in parallel with a large value resistor(around a few megaohms or so) then ground one side of the coild. the other side of the coil is in series with another large value resistor( around a few hundred thousand ohms) at the output of the op amp, and power supply connect a led (using a 1k resistor)

[Ztuibyman]

ohh, i'm gonna need the circuit, it's difficult to understand from the text...

[tangnatalaga]

I can send an schematic to you. You can get a 741 op amp at radio shack for a buck or two, with the resistor and everything it probably cost less than 5 bucks. Mine is more sensitive than this one because it uses op amp. You dont even need a lot of winding on the coil.

[norulridz]

can i have it???? please.. iwanna make it as my project

[coolsciencetech]

can you send me the schematic? i already have a 741 and was looking for something to do with it :P

[tangnatalaga]

ok do you have an e mail? Also what voltage do you want to run it on?

[coolsciencetech]

jlordman@gmail dot C 0 M

and for voltage, either 9V or 3V is fine, basically so that it's portable

[coolsciencetech]

hey man did you get my email?

[Jobob542]

You should try a MOSFET instead of a transistor , you would get a very large increase in range.

[Ztuibyman]

thanks, i'll try that

[nbm34]

Thank you very much for your reply on this matter Ztuibyman. With all that coiling it is hard to imagine it having a weak signal. I do know now thanks to you. Comprehend the need for a transister, to give a good signal in the led, to keep its brightness. Much appreciated

[nbm34]

hI i AM NEW to electronics so please forgive my ignorance. I have a rough idea why this device has a transistor. Can anyone please explain briefly the function of the transistor and its purpose in this circuit.COULD IT OPERATE WITHOUT A TRANSISTOR ? Thank you

[Ztuibyman]

a transistor just amplifies the incoming weak signal from the coil. If the electromagnetic wave would be larger, it could (i guess) work without a transistor, but the LED would be a lot dimmer.

[alabardeirodenassau]

nice 5 ***** stars

[GEAR1902]

that was cool!!!5\5stars!!can u send me scheme of that sensor plz...

[Ztuibyman]

search for it on the internet, i'm sure it's there

[AssemblerGuy]

For extra sensitivity, try replacing the transistor with two transistors in a Darlington arrangement (see "Darlington transistor" on Wikipedia

[Ztuibyman]

actually, this alone is a darlington transistor already

[98209276]

i get it the magnet acts as the gate voltage to the transistor which switches the battery trough d,s and through the resistor into the led

pretty cleva good job nice demo 5 stars

[Ztuibyman]

thanks