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How to make an Electrostatic Polarity Detector(Electric Field Detector)
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- Опубліковано 6 чер 2017
- This is a simple Electrostatic Polarity Detector(Electric Field Detector) made of FDS8958A Chip.
This chip(FDS8958A) contains N- and P- Channel Enhancement mode power field effect transistors.
Old Version : Using 9V battery.
New Version : Using 3V battery.
The circuit diagram appears on the video. 07:13
Lightning detector : • Lightning Detector Exp...
Thomas Kim has the steady hands of a brain surgeon! He makes soldering to the teensy Mosfet look easy but it was pretty tricky for me. Since I was taking too much time and heating the chip too much, I was damaging it. It would work perfectly for a bit and then start misbehaving. LED would stay on or come on by itself. Pushing the tact switch started making one LED light up. And so on. So I bought 10 Mosfets and kept at it until I could get them soldered up quickly. This is an elegant design. Thanks to Mr. Kim for posting this.
Wow, that’s some careful, steady-hand solder work!
As always, Great video Thomas. Thanks!
Really, really nice, man. Fantastic work!
Excellent!! Thank you.
Nice one! I'll build one of those soon :D
Thanks!
did you build? how was the result
Very useful, will make a great gift for my niece.
Very nice video Bhai. Beautiful picture.
Nice! 100% like :-). If I get around to building one it will be in a black project box. The LEDs will be placed so that they shine on the end of the straw inside the box, thus the whole straw lights red or blue, mauve for AC. The battery will be a CR3032 lithium button cell. The tactile switches will be rubber buttons from an old keyboard, so the box wont need taking apart to operate.
Thanks for sharing
_really cool_
Very good!!! Congratulations from nord est italy!!,
I just completed this build and it works great!!! One question I have though is how do you discharge the LED's so easily? Mine if they detect a heavy charge in either polarity they have a tendency to just stay on even when I try and discharge it with a material with opposite triboelectric polarity.
circuit diagram is at 7:13, took me some time to find it..
What are the boxes with blue and green leads?
@@AlienRelics should be tactile switches, watch at 2:00
Great idea! Thanks for sharing. I understand it is possibile to make this curcuit with any N/P enhanced channel mosfet pair. There might be difference in sensitivity, but it should wiek, right?
Cool 😎
Thank you for showing, very interesting !
So very interesting that I have just ordered me some FDS8958A :)
I hope my eyesight will be good enough to solder such a little chip, I have never done SMD, only dil and other 'regular' discrete components.
Hey, can I ask you where you found FDS8958A please ? I can't find it anywhere :'(
@@artoxx5662 ebay
@@artoxx5662 Try IRF 7317.
I made this and circuit and thought it was totally awesome. I epoxied everything securely together and fried the chip with a spark from the PVC pipe I had rubbed. So I turned on my 200kv Van De Graaff generator and zapped the crap out of it until it was completely FUBAR.
So don't put the voltage on it, ok?
Edit: P.S: I'm not Thomas.
My new one is totally sweet with a tiny acrylic box and antenna cover with a small 200 mAh 3.7 volt rechargeable lipo battery and micro USB charging board. It is totally protected including the power switch so it is not as likely to get zapped to death. It is very sensitive already but since the chips came in a five pack I have extra ones to make the even more sensitive version T. K. showed us.
Can I have a question, pls? In my country there is no FDS8958A, can I use AO4060 transistors?
Thank you very much!
Buen trabajo
Hello, thank you, I built the same as you, but the red led never lights up. Always the blue lights up. Red works fine with 3v though. An idea ? Thank you
Thomas Kim, ensina a como fazer um Van de graff com melhorias
This seems like it could work for a secret lock or something similar. Would it be possible to expand the circuit?
Hi
I tried making the circuit on breadboard using npn (bs170) and pnp (bs250) mosfets instead of the IC but it doesnt work. The leds remain off and do not respond to a pvc pipe rubbed with wool. Only a couple of times i saw one led flicker very dim. I use 3V (2 AA cells),
I also replaced the npn bs170 mosfet with irfz44 mosfet and now one led keeps glowing all the time and the other led glows if press the switch.
What could be the issue?
Also, why are the 2 tactile switches used in this circuit if they are never pressed?
Thanks.
Have you tested these out on a dielectric pulled out of a "dissectable capactor" ?
What diameter or awg is the wire for the "antenna"? Could it be made of multiple core? Are there significant differences?
Great idea and skill! But I don't understand the switches for, are they normal close?
Thank you for sharing nice video tutorial easy to understand FDS 8958A can replace the other one?
The other one?
What kind of straw did you choose this is Teflon in a glass tube?
How to understand this circuit? Would you recommend any path of learning in order to learn such "practical" circuits? I had some circuit theory during my studies, but we were calculating some stuff that noone even understood. I didn't learn anything from these lessons. I'd like to learn on my own. Thanks in advance!
Could you explain or forward me to a website ( or theoretical material) how is it detecting the different polarity and reacting to it. I understand that the chip ( which I'm not too sure what it does) detects electric field but how and why does it react in a way that when a negative charge comes in one LED turns on and not the other. Does it have to do with the position you soldered the connections? Even if it's positioning, does the chip work in such a fashion that one side detects one polarity, and the other side the other polarity? If this is what happens, how does it happen? How can that microchip do that? I am familiar with maxwell's equations but have a hard time understanding eletronic devices ( specially microchips and such). Sorry if it's an obvious question, and thank you for posting.
As an electronic hobbyist I'll explain to the best of my knowledge:
As you can see the detector wires (yellow in the circuit diagram) are connected to each of the 'Gate' terminals of the chip. This makes them act like a tap would turn on water (in this case electricity!) causing the LED to light. As the other terminals (Source) of each MOSFET (the 'switch' inside the chip) are connected to the positive and negative poles of the battery, they both react to opposite poles of the detected electrical field. When the field detected is 'positive', current would flow through the Gate G1 causing the MOSFET to 'open' and this would put the red LED on. The opposite for a negative field.
As you can see the arrow connected to the Gate inside the MOSFET diagram faces the opposite direction in each one - this indicates the current flow which causes it to operate.
(If I'm wrong please correct me!)
Thanks for taking the time to explain. I think I get it. The current is created to the correct terminal of the battery, turning the proper light on.
i cant find the fds8958a ic..? can i use some other ic instead of this....??
Hi - great circuit. May i know what is the purpose of the tact switches. Reason being that it us always off. Tnx
I just was able to re-create this build and as far as I can tell it seems like the tact switches act as a reset for the LED's. If they are glowing and you push the tact switch, the LED turns off immediately.
So, does it work without the tact switches ? Please
you use nice and taft van de graaff, could you share photo components of it?
Hello, how long are that wires? Thank you
..nice idea use tact switch as high voltage capacitor.
Is that what the switches were for? I was wondering what purpose they served. Thanks!
can i use normal MOSFET's , what transistors are they
Hi !! can you recommend me some alternative tester aside from using the van de graaff thing ?? thanks ..
Rub a piece of pvc against your hair, it should light up blue!
Hey Thomas Kim! I'm ramping up on some of my experiments and I was thinking about this design. Is it possible to use the same circuit but in place of an LED to put probes to a voltmeter to detect intensity of the field given proper calibration? I'll probably test it as I build my copy of this design. But thought I might share that thought with you.
have you tested these out on a dielectric pulled out of a "dissectable capactor" ?
Did you build one?
how about using LED bipolar ?
Good
But how did you make a van de graaf machine
Hi kim little switch are needed?
I try without switchs and red led always on with a small light but work when touch it.
Really work whit switchs?
Sorry english tnx.
using switches you can short residual charge that keep the led on .
What are switches used for?
Very nice! Can I use one 3.7V rechargable battery?
I did. It works. A 250ma reading 4.2 volts and it seems to work great.
Hi! This is awesome! I would love to build one.
Sadly I fail to understand the use of the buttons. Are yours the type that close the circuit only when pressed continuesly? What is their purpose?
Any help would be great!
The buttons are to turn the power on and off from the batteries
@@martymulhall680 No. They are only on when pressed. I don't understand its meaning either.
They are to discharge the gates of mosfet, thus making it read 'zero'
안녕하세요~ 영상 보면서 비슷하게 하나 만들어봤는데요. 저는 고휘도 led를 사용해서 저항은 제거하고 연결했습니다. 근데 led가 꺼지질 않네요. 전원넣고 가만히 놔두면 혼자서 빨간색이나 파란색으로 랜덤하게 켜집니다. 점점 밝기가 증가하구요. 그 상태에서는 정전기를 가까이해도 반응이 없구요. 초기화 해서 다시 작동하면 또 되었다가 안되었다가 도통 알 수가 없네요.
칩에 염분이 묻어서 그런 것 같네요. 조립하면서 땀 등이 묻게되면 미세한 누설전류가 생겨서 서서히 켜지거나 꺼지는 현상이 생깁니다. 전지쪽은 다른 부분과 접촉하지 않게 해야 합니다. 만약 손과 접촉하고 있는 상태에서 게이트에 정전기를 가까이 하면, 게이트로 정전기가 직접 흘러서 mosfet 이 손상됩니다. 그리고N,P 두 개의 MOSFET 의 게이트 각각도 서로 절연이 잘 되어있어야 합니다. 그렇지 않으면 어느 한쪽은 계속 켜져있게 됩니다.
답변 감사드립니다. 다시 만들었는데 잘 되네요.
@@ThomasKimWhat is the switch installed for?
Thank you so much for this!
I couldn't find the FDS8958A s oI'm using SI4532A. Will it work the same?
Pavan BS did it work??
did it work?
I wonder if you could detect a charge during a thunderstorm by pointing it up to the sky.
Yes. Basically, grab a golf club, scotch the detector to the very end of the club, point it to the sky.
And yell smt like "Wingardum leviosa".
...
Obviously I'm joking. Pls do not be offended :=)
What is that thing you r holding
can't find the chip, anywhere! Please help me out!
What are two things after ic
Why buttons? As an IC holder? Or as a capasitor?
the buttons is used for discharging the residue charge at input of circuit
Why red and blue LED? They are so far apart considering forward voltage.
Is that an isolation chip?
Seems to be impossible to get the FDS8958A chip, I've found one place that sells it and the estimated arrival time is 7months
I have this IC few pieces with me.
I found a strip of 20 of these chips on Ebay and they were delivered about 1 week later.
Hi Thomas. Would You sell me some of Your equipments? I am willing to buy Your electrostatic polarity meter and some other stuff too.
Sir,
I have tried this ckt but not working..?
Hi, I'm from Uruguay, so I can replace the chip (FDS8958A)
Hi,thomas can we use 555 timer ic instead of this to make this circuit please reply immediately. bro.
how to make positive and negative van de graaff
Sir ,we Can't purchase this ( Fds8958a) ic in India so please tell me relevant ic for this circuit.
Is it difficult to use Ali Express? Also available on Ali Express.
IRF 7317 work fine too.
what is that device that is in your hand
A van der graaf generator
is there any alternative chip for this circuit because I donot found your one. plzz reply. thank you
if still around that chip is at mouse electronics.
@@brianbabey I was able to find them on Ebay also
what type of bottle is it and thickness of staraws etc?
Innocent ( fruit juice) for the bottle
Maybe it makes sense to add gate protection? Zener diode?
The zener diode leaks electric current. Unfortunately, if a gate protection circuit is inserted, static electricity cannot be detected.
@@ThomasKim Why are we not afraid to break the gate?
@@MegaVolt_ex If you touch a static object, the gate will break.
Once the light is on, don't bring it closer.
is there any replacement for fds8958a chip??
it is very difficult to find
N , P MOSFET
IRF 7317.
Also can I use a 555 IC?
İf the 555 has n and p channel jfets , couse they are sensing the fields
I want to make this project but I'm not getting that ic...any replacement for fds8958a ic pls!??
N , P MOSFET
IRF 7317 work fine too.
Amazing, is there any equivalent IC to FDS8958A?
N , P MOSFET
IRF 7317.
Plz send Chip buy link
What's the purpose of the buttons? If you didn't click them, then the current flow wouldn't be possible or what?
I am new to this circuit/usage - but I think the switches are DPST*, thus they will switch off the battery supply to the FETs ( and disconnect the antenna wires at the same time) in the 'OFF' position.
*Double Pole Single Throw
Schematics?
ua-cam.com/video/h3QD-HudH2o/v-deo.html
I tried to make this and both of my led are always on did i do something wrong?
i have the same problem, Did you solve them?
What is the purpose of those buttons?
To discharge residual electrical charge
The button switches are inside the bottle, do you have to press them often to discharge the residual electric charge? During your demonstration you appear to discharge the residual electric charge by touching the plastic straw with your hand. And would the FDS8958A electric field detector be more sensitive if you used a 9 volt battery? Thanks!
I wish there was a reply explaining
I live in the US. Those bottles are no where to be found here. Here we have plastic bottles, but none of them have nice straight walls. Thanks!
Langers juice bottle is ok.
can this be done with other microchips
I believe you can with a 4011IC
Circuit daygram plz🙏🙏🙏🙏🙏🙏🙏🙏🙏
That thing is just a plastic straw? I thought it was some Wi-Fi antenna 😆
230v line tester
Please show atleast a circuit diagram of this.. it's difficult otherwise..
07:13 circuit diagram
that fds8958a chip isent easy to get its not even available on e bay so not many can build this circuit, the 2 electronics stores here jaycar electronics and altronics both dont have this ic chip
whats the part number on the buttons?
Read the discription.
If you search for 'miniature tactile switch' you'll find lots of different types to choose from!
just watch and click like
Send me the link of old version with 9v battery
Извините, не понимаю :(, зачем вы поставили кнопки?
Для случая когда антенна зарядится, чтобы можно было обнулить ее заряд.
U maked 4 for sale? )))
to show it to students at school.
Bizarre choice of mosfet package. Why not just use two discrete mosfets with schottky body diodes in TO packages where the lead outs are wires?
Those microscopic SMD devices are almost impossible to work with and virtually unsolderable without damaging the device! ???
Old is o'd... New is cool innit :)
Why the hell do people just throw out the baby with the bath water on projects like these.
Can a person just use the FD chip for pos, neg?
Would it work? With discrete mosfets, I mean. Would be much easier to get and lots of options. I really don't understand electronics well enough to know what's going on here. Do you know what purpose the buttons serve?
Circuit Drawgram send me plz
7:13 Your welcome.
Ps I'm not him.
FDS8958A MOSFET : SMD soldering is not so easy : Get an MSOP - 8 female to DIP - 8 male adapter and save yourself a ton of time and nerves.
Any alternative for fds8958
For this tiny chip no sop and dip support. It is too tiny. Its not that size like timer 555
Can I make this without a button?
散了吧，要小主板的
well someone down the page says he got the part from mouse electronics its mouser with a letter r on it and they dont even have it in there online catalogue, so i did some digging, and in australia where i am rs components sells this ic chip part and the minimum you can buy is ten for $11.61 but im in western australia they used to have an office here only but according to the rs components chat person they are in sydney and to make things worcer they are out of stock , and have to back order and if they coming from over seas it may take time even more if its routing through china where customs scans everything now and slows the postage down from coming out of china and to make things even more worse rs components takes bank deposits and bankcards only so if ya not working and dont have these cards ya stuffed so the typical hobbyist cant get them i told them that being out of stock is the worst thing a customer hears and that that western australia where i am this state relies to much on lenghty interstate imports cause they dont have anything here most of the products have to come from eastern states , i asked them dose my visa debit qualify as a bank card they couldn't answer that , they shuffled me onto another to answer some qestions so i left , they would do better if they stock up more and bring out better buying options than the other which cuts customers off from trying to buy from them buy making the payment options so limited .
Damn ever heard of a period or a line break?
Dinesh Kashyap
using for what?
اي الاستفادة من كدا طيب 👀👀
Bhai iska samaan Kahan milega
Hi
Very weak circuit. Mine can detect up to 12 feet away
Thanks for sharing