Okay so looking at the comments below a lot of people are confused about how to make this thing Also so I am as well because in your video description it says 10 uf 25v but in the video it says 100 V when zoomed in and closely looking at it maybe you should of given a updated schematics maybe describe how it works Or make a new video that is more updated
Hi, the circuit diagram I shared is correct. This meter works at 9V, so capacitors with 25V tolerance are more than enough, the important thing is that they are of the value in uF that I have specified (for example 100uF for what you are referring to). I'm going to explain myself better with an example: You have two capacitors A and B A = 100uF @ 25V B = 100uF @ 100V The capacitors are identical, have the same capacity (100uF) but "A" can only be installed on circuits that work up to 25V, while "B" can be used on circuits that work up to 100V I used the 100V ones because I didn't have any more from 25V :) otherwise it is indifferent, even 50V ones are fine, as long as the capacitance values in uF are respected
Thanks for answering so fast. Yep, I changed to the 2.7k and it still gets hot, I screwed up somewhere. Now I get to play with it some more to figure it out. I love this stuff!
@@Stefano91ste I just finished building one! it works, but it would be nice to know how to adjust the two trim pots, I have no idea what to do with them. I thought the 47kohm one would adjust LED brightness but I notice zero difference when I adjust it. Does the 10kohm adjust input gain? I also haven't been able to notice much difference changing it and don't know where to leave it as a default. Thank you for sharing this cool project!
Hi! I just built your circuit on a breadboard and it works flawless!....but only after I replaced the slightly used 9V battery with a brand new one. It seems, the right voltage is very important and if your circuit is not working well, it might be because of an old battery... BTW: I got a very strong signal about 80cm(!) away from the door of my fridge. I built another similar circuit using just eight 2N2222 transistors and the same antenna and almost no reaction from the fridge door but more reactions from other electronic devices... very interesting! BTW2: Instead of an router antenna I just used a 1mm thick copper wire coil with 12 turns and a few centimeters of straight wire and it works fine! Many thanks and keep up the good work! Cheers!
Hey bro. Great video. I had two questions 1: Which type of antenna have you used? If i were to describe it to the shopkeeper, there should some number or specification of the antenna. 2: Upto what distance from the cables can it detect emf, if the cables were to be laid underground?
Hi, thank you! 1) I used a recycled antenna from a router. 2) Up to 3/4 cm of depth it works, but it also depends on how many EMF it emits the cable you want to detect.
It won't work if you're trying to detect high voltage underground cables. Because those cable are designed to retard and redirect emf to avoid inducing unwanted voltages into any adjacent conductive materials .
Stefano plz provide your email id. It is NOT working for me. I need to discuss with u. I had to modify few parts in the circuit: I used NON-variable resistors everywhere. I used 2uF cap instead of 4.7uF. Also I used ALL LEDs as the RED LEDs. I used 3915 chip as LED driver. Can I use normal copper coil instead of this antenna?
Thanks for publishing your work! I'm trying to understand the circuit though and I'm a little confused by the 10nF capacitor. Wouldn't this capacitor filter almost any frequency above 160KHz? At 160KHz the capacitive reactance is at 100Ohms. And the RC filter that follows only filters everything under 15Hz right? So what's the point? The potentiometer after the antenna is a high pass filter right? So it can filter out very low frequencies, is that it? Many thanks for your help!
I would love to make this project but since you highlighted it's flaws, can you tell me what should i change in this project to find every frequency in the area without filtering ?
Woow! i found the game on steam.. the EMF meter they use in the game is a K2 This: bit.ly/2KrjRJh A few years ago I was thinking of buying one, then I said to myself.. I can build it! xD
Very interesting DIY. We are doing project on the same using your circuit. We buid the same but it not working with that precision like video. Our most LEDs are blinking simultaneously just dimmer or brighter after getting near to the mobile. Is it enough or we have to add more circuit in it ?
Hi!! thanks for sharing!! is a beautiful project and is works great!!! Just one question, i have a lot of problems to calibrate the sensor, it looks like in one moment the antena saturates. I left the potentiometers out of the box so i can calibrate the circuit, do you have some recommendation or advice, is really hard to be calibrating all time. thanks!!
Hello, thank you!! I adjusted the potentiometer only once, so that far from electromagnetic fields all the LEDs are off. There is no need to calibrate it every time.. I hope I understand your problem!
Hi, It is used to "clean" the line that goes between the amplifier and the LM3914 when there is no signal. I added it to the 100K one in case someone decided to separate the amolifier circuit from the measurement circuit, for example using a diode or a signal transformer.
@@Stefano91ste Can you make a more sensitive version of the EMF........with the same OP-Amps and Dot Bar display driver LM3914, I made your version, the LEDs light up one after the another reacting to the increase in magnetic field, but there is one problem, the first 3 LEDs would light up bright but the rest two only shines and barely lights up to the full even when there is very strong EMF field, why is this so?
hola soy de peru . esta interesante tu proyecto . me gustaria saber como octienes los rangos o la medida para que se canvie de color los leds al optener la radiacion de los dispositivos que emitan radiacion electromagnetica....
That is not important. The Bandwith of this Amp is 300kHz. EMF are detectable over a super wide bandwith. This circuit should also be good to detect Thunderstorm lightning. And yes, you could also use normal OP-AMPs
Hello. I have made the circuit as per your diagram. All the LEDs blink once in starting, after that it is not working. Where is the problem. I am puzzled. I tried this circuit more than 5 times. Every time same problem
Hello, do they all turn on like mine at start-up and then turn off? and then nothing works? if yes, I think the problem may be in the amplifier (LM386) or in the antenna including the components close to it. Can you try with a second LM386?
Your circuit diagram has a mistake in the LM386, the output terminal of the opamp is not the connector 6, the 6th pin is the power supply of the IC and the 5th pin is the output of that component. Just that
Hi thank you! 4.5V are too low for this circuit.. it would not work properly. Why do you want to use 3 AA batteries? take up more space than a 9V battery.
Hi I would like to ask if instead of connecting to pin 5 of the lm3914, to connect it to a voltmeter or anything that could give a reading? What do you recommend?
I have a question. I'm using a LM3915 instead of the LM3914. Will this work the same with it? The reason I'm asking is because The LED's don't cascade like yours does. They all light at the same time except for the red one. Or did I screw up the circuit? I have gone through it like ten times and can't find any mistakes.
Hi, If apart from the power on the circuit works well then everything is OK. For these non-musical projects I prefer to use the LM3914 ICs as they are linear and not logarithmic like the LM3915
I have a hard time finding that 1uF electrolytic so if you could send me link where did you got them that would be nice.And can i use 50k trimmer since i got them in my local store.Thanks :)
Hi, the scheme works, the video shows it. Other people have built it and it works.. check that all the components are OK and that there are no broken tracks on the breadboard.
Thank you, i found it on this site: www.futurashop.it/?gclid=CjwKCAjwmq3kBRB_EiwAJkNDp8MnsxgpD4ceb-NSYn8P1D1jsuQ79zFk-_yx6diFg-YGEuE7y3pryRoCb5gQAvD_BwE
Hi Stefanoste. Noob he :-) I don't understand how the 47k pot is wired up in your schmatic, are you saying that the pot wiper is attached to pin 8 along with the pot positive fixed end. ie pin 8 of LM3914 is connected to 2 of the 3 pot pins (wiper and first fixed end). Thanks for the plans and the videos.
Hi, the 47K potentiometer is connected between pin 8 and GND, with the purpose of having a variable resistance on that pin. Pin 2 and 4 are also connected to GND
@@Stefano91ste Thanks for the reply. Just ordered all my part this week and finally found a supplier in the UK on eBay selling the LM3916 DIP as I could not find anyone selling LM3914, so using your other video on using LM3914,LM3915 and LM3916 I went and got the LM3916 and brought quite a few for other projects of yours, got 10 for £4
Hi, Measure the intensity of electromagnetic waves produced by home appliances and electronic devices. The instrument measures well between 50Hz and 900MHz
Thank you! unfortunately when I assembled this project I did not recorded the step by step construction part, maybe in the future I will make an improved version!
That's cool, would make a good video, call it something like 'DIY how to make a EMF meter' having the how to in the title would boost the search abillity Just giving my thoughts
Hi, I built this circuit exactly as in the video, used 50k log pot instead of 47k, and WiFi 10 dB 20 cm antenna. Double-checked the circuit, unfortunatelly, LEDs don't light up even when the antenna is laid on the power cable of my soldering iron turned on. Since the antenna connects to RP - SMA female connector, I initially connected the antenna wire to the middle pin of the connector, as well as the outer thread and in both cases none of the 5 LEDs light up. They only briefly light up when I turn the power switch on. Also tried fine tuning the 10k trimmer, and couldn't find a sweet spot. I also later noticed in the video, where you showed the pcb top and bottom, by identifying some of resistor color bands, 2 identical ones on the top that turned out to be 2.1k (not 2.2k), and on the bottom side the cap that goes to the antenna says .22, i.e. 220nF if I'm correct. Should I make this changes in order for this circuit to work?
Hi, the circuit works correctly following the diagram, the small changes that are known on the pcb are due to the fact that I had finished some components, but they are irrelevant. From how you describe the malfunction of your circuit it would seem that LM386 does not amplify enough..
@@Stefano91ste Thanks for your reply. Hmm, I should maybe test the LM386 chip with some circuit on a protoboard. But, which side of the antenna SMTP connector did you connect the wire? The middle pin or the thread? Oh, and are you sure that altering mentioned components wouldn't do any effect?
Hi Viktor Which side of the antenna SMTP connector did you connect the wire? - I connect the thread. Are you sure that altering mentioned components wouldn't do any effect? - If the alteration is minimal, for such simple circuits, there are no negative effects.
I'm curious about 1 thing, in the components list, you only state 1 red led, so is the power on led an option or a mod after you made the list, also if its after you made the list is the circuit diagram including this led and its resistor?
Hi, the scheme works, the video shows it. Other people have built it and it works.. check that all the components are OK and and if you tested it on breadboard check that there are no broken tracks.
I made this circuit and the LM386 is getting real hot. Your list of components says 2x2.2k resistors which are Red,red,red. But the one you made they look like they are Red,violet,red which would be a 2.7k. Is this a mistake?
Hi, no errors with the resistors, the 2.7K (or 2.2K both are fine) these resistors only work on the LM3914. The LM386 must not get too hot, try to check all the components connected to the LM386, I think there is something wrong that makes it always work at 100%
Hi, what kind of error do you have in the link? Because it is working for me. Alternatively, I inserted the same electrical diagram at the end of the video
Hi, I used the antenna of a router.. it works and is beautifully aesthetically.. but this is not the k2 meter, this is my version of an EMF detector/meter
Hi, I built this and put the diagram at the end of the video, it is not on the market. There are models like this on the market: www.banggood.com/custlink/3mmvBmCDbT
Nice little circuit I just wish people wouldn't put that music in there videos!!! 1. I have to watch it on mute (cuz it is very annoying) and 2. I have to keep checking I didn't miss any instruction (mute-unmute-mute-unmute) that may or may not have been spoken-- very aggravating-
Hi, I thank you. As for background music: it helps to make the video more pleasant, because I do not speak in my videos, but I explain everything through images and text. A greeting
The cost should be around 15 $.. it depends on where you buy the components. The tool is used to detect electromagnetic waves, I have no idea what ghosts can emit or be made :)
@@Stefano91ste I see. One more thing I noticed in your circuit at the end of the video: how could pins 2, 3, 4 of the LM3914 IC go to ground, i.e. the - of the battery and the same line goes to + of the battery, through main switch? Shouldn't this short out the battery?? I'm no expert, but correct me if I'm wrong.
This is true, but I have never tested the exact range accurately. When I designed this circuit I considered only that it was able to detect electromagnetic field produced by electrical equipment.
32 clicked dislike after trying this and learning Orgonite Pyramids don't block SHIT in the way of EMF. If you sleep in a Cave lined in 3 foot plastic, 6 feet concrete 9 feet lead you should be safe from the 5G monster. L💀L💀L💀L💀L💀L💀L💀L💀L💀L💀L
Many of those who press dislike don't leave a comment, that comment would be useful for me to understand what they didn't like... don't like the project? Don't like the fact that I don't speak in videos?
@@Stefano91ste i made this.. pasteboard.co/Ie3Bj8c.jpg ... but all leds flashing same time.. not cascaded like yours.. any idea? edit:pasteboard.co/Ie3DlQE.jpg
Okay so looking at the comments below a lot of people are confused about how to make this thing Also so I am as well because in your video description it says 10 uf 25v but in the video it says 100 V when zoomed in and closely looking at it maybe you should of given a updated schematics maybe describe how it works
Or make a new video that is more updated
Hi, the circuit diagram I shared is correct.
This meter works at 9V, so capacitors with 25V tolerance are more than enough, the important thing is that they are of the value in uF that I have specified (for example 100uF for what you are referring to).
I'm going to explain myself better with an example:
You have two capacitors A and B
A = 100uF @ 25V
B = 100uF @ 100V
The capacitors are identical, have the same capacity (100uF) but "A" can only be installed on circuits that work up to 25V, while "B" can be used on circuits that work up to 100V
I used the 100V ones because I didn't have any more from 25V :)
otherwise it is indifferent, even 50V ones are fine, as long as the capacitance values in uF are respected
Thanks for answering so fast. Yep, I changed to the 2.7k and it still gets hot, I screwed up somewhere. Now I get to play with it some more to figure it out. I love this stuff!
@@Stefano91ste I just finished building one! it works, but it would be nice to know how to adjust the two trim pots, I have no idea what to do with them. I thought the 47kohm one would adjust LED brightness but I notice zero difference when I adjust it. Does the 10kohm adjust input gain? I also haven't been able to notice much difference changing it and don't know where to leave it as a default. Thank you for sharing this cool project!
@@BAMFSpYdy Hi can you share a schematic of this wiring?
@@davidchristover8311 The schematic is at the end of the video.
Thanks for sharing. Was looking for something like this
Thank you Steve
Hi! I just built your circuit on a breadboard and it works flawless!....but only after I replaced the slightly used 9V battery with a brand new one. It seems, the right voltage is very important and if your circuit is not working well, it might be because of an old battery... BTW: I got a very strong signal about 80cm(!) away from the door of my fridge. I built another similar circuit using just eight 2N2222 transistors and the same antenna and almost no reaction from the fridge door but more reactions from other electronic devices... very interesting! BTW2: Instead of an router antenna I just used a 1mm thick copper wire coil with 12 turns and a few centimeters of straight wire and it works fine! Many thanks and keep up the good work! Cheers!
Explaination was nice 😍
Thank you!
Splendido video, sembra di essere lì dal vivo.. *
Grazie mille :).. è un po l'effetto che cerco di ottenere in alcuni video!
Very professional looking. Nice work...
Danny Woods thanks you !!!
This is awesome. Thank you.
Thank you!
Look at that! It’s my all time favorite music track!
Nice project though!
This should help find that spook thats been yanking my leg at night, good work thx!
excellent idea congratulations!
Thank you :)
Beautiful!
Plzz sir..make a video how it is made with all equipments
Make a comparsion with K-II meter, great video!
Thanks, as soon as I get the K-II in my hands I'll make a video ;)
Thanks!
Electric diagram at 2:07
amigo podrias hacer el circuito de nuevo
Hola! por qué debería rehacer el circuito?
Add me
Can you give link of Diagram picture in hd resolution?
Hi, nice work.
Can you send a link to the antenna?
Why is there 10K Trimmer?
Thanks for the answers.
Parabéns pelo vídeo é Top.
Muito obrigada pela dica agora vou termina-lo. Tenha uma boa noite um abraço meu amigo.
De nada :)
NICE !!!
Thanks you :)
I'd like to have a peek at it's construction as I'm not very good with this kind of schematic.
Hey bro. Great video.
I had two questions
1: Which type of antenna have you used? If i were to describe it to the shopkeeper, there should some number or specification of the antenna.
2: Upto what distance from the cables can it detect emf, if the cables were to be laid underground?
Hi, thank you!
1) I used a recycled antenna from a router.
2) Up to 3/4 cm of depth it works, but it also depends on how many EMF it emits the cable you want to detect.
It won't work if you're trying to detect high voltage underground cables. Because those cable are designed to retard and redirect emf to avoid inducing unwanted voltages into any adjacent conductive materials .
Amazing work... Thanks for this video. It would be great if we can add a LCD display to this meter. Can u make one video for that? 👍
Hi, thank you! Surely in the future I will make an Arduino based EMF Meter, so with 5/6 LEDs + LCD Display
Stefano plz provide your email id. It is NOT working for me. I need to discuss with u.
I had to modify few parts in the circuit:
I used NON-variable resistors everywhere.
I used 2uF cap instead of 4.7uF. Also I used ALL LEDs as the RED LEDs. I used 3915 chip as LED driver.
Can I use normal copper coil instead of this antenna?
Gostei muito muito mesmo
Thanks for publishing your work! I'm trying to understand the circuit though and I'm a little confused by the 10nF capacitor. Wouldn't this capacitor filter almost any frequency above 160KHz? At 160KHz the capacitive reactance is at 100Ohms. And the RC filter that follows only filters everything under 15Hz right? So what's the point?
The potentiometer after the antenna is a high pass filter right? So it can filter out very low frequencies, is that it?
Many thanks for your help!
I would love to make this project but since you highlighted it's flaws, can you tell me what should i change in this project to find every frequency in the area without filtering ?
Who's here from Phasmophobia?
Hi, what is Phasmophobia?
@@Stefano91ste it's a popular ghost-hunting game in which you can use an EMF meter that looks exactly like the one in this video!
Woow! i found the game on steam.. the EMF meter they use in the game is a K2
This: bit.ly/2KrjRJh
A few years ago I was thinking of buying one, then I said to myself.. I can build it! xD
@@Stefano91ste Awesome stuff, I might have to give the project a try myself
I was wondering where you connected the negative battery
nice sharing...tq...from malaysia
Thanks for appreciating my work!
Very interesting DIY. We are doing project on the same using your circuit. We buid the same but it not working with that precision like video. Our most LEDs are blinking simultaneously just dimmer or brighter after getting near to the mobile. Is it enough or we have to add more circuit in it ?
No, if it is mounted exactly as in my scheme it must work, the sensitivity must also be adjusted via the trimmer
Electronics Projects - Stefano91ste Thank you for replying sir. Keep posting such DIYs
Can you do a totorial on this Emf meter everything down to the soldering Please????
Does it detect metals like a sensor, or give me a diagram of a device that detects metal with an ion sensor?
Awesome video. I'm going to build one for myself. But can you add a buzzer to the circuit?
Hi! yes, you can only add an active buzzer (3v buzzer) in parallel to one of the LEDs, so that it is activated when a specific LED is on
Hi!! thanks for sharing!! is a beautiful project and is works great!!! Just one question, i have a lot of problems to calibrate the sensor, it looks like in one moment the antena saturates. I left the potentiometers out of the box so i can calibrate the circuit, do you have some recommendation or advice, is really hard to be calibrating all time. thanks!!
Hello, thank you!! I adjusted the potentiometer only once, so that far from electromagnetic fields all the LEDs are off. There is no need to calibrate it every time.. I hope I understand your problem!
excellent
Gracias:)
What is the use of the 2.2k resistor to ground, from the 4.7uf cap?
Hi, It is used to "clean" the line that goes between the amplifier and the LM3914 when there is no signal. I added it to the 100K one in case someone decided to separate the amolifier circuit from the measurement circuit, for example using a diode or a signal transformer.
@@Stefano91ste Ahh, now I understand..... thanks for the reply 😇
@@Stefano91ste Can you make a more sensitive version of the EMF........with the same OP-Amps and Dot Bar display driver LM3914, I made your version, the LEDs light up one after the another reacting to the increase in magnetic field, but there is one problem, the first 3 LEDs would light up bright but the rest two only shines and barely lights up to the full even when there is very strong EMF field, why is this so?
hola soy de peru . esta interesante tu proyecto . me gustaria saber como octienes los rangos o la medida para que se canvie de color los leds al optener la radiacion de los dispositivos que emitan radiacion electromagnetica....
Hola, gracias!
Yo usé la báscula estándar del LM3914 para los colores de los LED
LM386 is for audio, Not RF,
That is not important. The Bandwith of this Amp is 300kHz. EMF are detectable over a super wide bandwith. This circuit should also be good to detect Thunderstorm lightning.
And yes, you could also use normal OP-AMPs
Divine 😎
Can I buy one of your EMF meters? It looks mad cool.
Hello. I have made the circuit as per your diagram. All the LEDs blink once in starting, after that it is not working. Where is the problem. I am puzzled. I tried this circuit more than 5 times. Every time same problem
Hello, do they all turn on like mine at start-up and then turn off? and then nothing works? if yes, I think the problem may be in the amplifier (LM386) or in the antenna including the components close to it.
Can you try with a second LM386?
Hello I am interested in this project. Does this have a kit available online? and where did you buy it? Thank you.
Hi, you can't buy it , is not a commercial kit, I designed it.. in the end of the video I published the electric diagram
Your circuit diagram has a mistake in the LM386, the output terminal of the opamp is not the connector 6, the 6th pin is the power supply of the IC and the 5th pin is the output of that component. Just that
Hi, there isn't any error, pin 6 of the LM386 must be connected to VCC, the rest of the pins are numbered. follow the pin numbering.
Hey man, thank´s for the tuto. Is there any circuit modification (other than the resistor for power LED) to opetare it over 3 AA batteries?
Hi thank you! 4.5V are too low for this circuit.. it would not work properly. Why do you want to use 3 AA batteries? take up more space than a 9V battery.
Have we add buzzer to this circuit
Very good work! How similar is your circuit to a real K2 EMF meter?
The circuit is different but the purpose is the same
Hi I would like to ask if instead of connecting to pin 5 of the lm3914, to connect it to a voltmeter or anything that could give a reading? What do you recommend?
Hi, pin 5 is the input of the Vu-Meter, by connecting a voltmeter you could read a small voltage variation.
@@Stefano91ste thank you very much!
I have a question. I'm using a LM3915 instead of the LM3914. Will this work the same with it? The reason I'm asking is because The LED's don't cascade like yours does. They all light at the same time except for the red one. Or did I screw up the circuit? I have gone through it like ten times and can't find any mistakes.
Hi, If apart from the power on the circuit works well then everything is OK. For these non-musical projects I prefer to use the LM3914 ICs as they are linear and not logarithmic like the LM3915
I have a hard time finding that 1uF electrolytic so if you could send me link where did you got them that would be nice.And can i use 50k trimmer since i got them in my local store.Thanks :)
Hi, the 1uF capacitor I took it in a shop near my house.
For the 50k trimmer OK, but only if you use it instead of the 47K one :)
i ready test at breadboard not working bro
Hi, the scheme works, the video shows it. Other people have built it and it works.. check that all the components are OK and that there are no broken tracks on the breadboard.
@@Stefano91ste ok thank bro now i will test at the soldering board if it working or not thank for you reply
Great project sir. Where did you get the box from?
Thank you, i found it on this site: www.futurashop.it/?gclid=CjwKCAjwmq3kBRB_EiwAJkNDp8MnsxgpD4ceb-NSYn8P1D1jsuQ79zFk-_yx6diFg-YGEuE7y3pryRoCb5gQAvD_BwE
How to connect trimmer in circuit, my circuit is not working
Hi, look at the wiring diagram I inserted at the end of the video
Hi would this also be strong enough to sense the EMF emitted by phones?
Hi, on some phones yes
Hi Stefanoste. Noob he :-) I don't understand how the 47k pot is wired up in your schmatic, are you saying that the pot wiper is attached to pin 8 along with the pot positive fixed end. ie pin 8 of LM3914 is connected to 2 of the 3 pot pins (wiper and first fixed end). Thanks for the plans and the videos.
Hi, the 47K potentiometer is connected between pin 8 and GND, with the purpose of having a variable resistance on that pin. Pin 2 and 4 are also connected to GND
@@Stefano91ste Thanks for the reply. Just ordered all my part this week and finally found a supplier in the UK on eBay selling the LM3916 DIP as I could not find anyone selling LM3914, so using your other video on using LM3914,LM3915 and LM3916 I went and got the LM3916 and brought quite a few for other projects of yours, got 10 for £4
what frequency range does it have ? What does it measure: magnetic, electric ?
Hi, Measure the intensity of electromagnetic waves produced by home appliances and electronic devices. The instrument measures well between 50Hz and 900MHz
I like you show the diagram, have you done a video of you building it so I could see in step by step
Thank you! unfortunately when I assembled this project I did not recorded the step by step construction part, maybe in the future I will make an improved version!
That's cool, would make a good video, call it something like 'DIY how to make a EMF meter' having the how to in the title would boost the search abillity
Just giving my thoughts
Hi, I built this circuit exactly as in the video, used 50k log pot instead of 47k, and WiFi 10 dB 20 cm antenna. Double-checked the circuit, unfortunatelly, LEDs don't light up even when the antenna is laid on the power cable of my soldering iron turned on. Since the antenna connects to RP - SMA female connector, I initially connected the antenna wire to the middle pin of the connector, as well as the outer thread and in both cases none of the 5 LEDs light up. They only briefly light up when I turn the power switch on. Also tried fine tuning the 10k trimmer, and couldn't find a sweet spot. I also later noticed in the video, where you showed the pcb top and bottom, by identifying some of resistor color bands, 2 identical ones on the top that turned out to be 2.1k (not 2.2k), and on the bottom side the cap that goes to the antenna says .22, i.e. 220nF if I'm correct. Should I make this changes in order for this circuit to work?
Hi, the circuit works correctly following the diagram, the small changes that are known on the pcb are due to the fact that I had finished some components, but they are irrelevant.
From how you describe the malfunction of your circuit it would seem that LM386 does not amplify enough..
@@Stefano91ste Thanks for your reply. Hmm, I should maybe test the LM386 chip with some circuit on a protoboard. But, which side of the antenna SMTP connector did you connect the wire? The middle pin or the thread? Oh, and are you sure that altering mentioned components wouldn't do any effect?
Hi Viktor
Which side of the antenna SMTP connector did you connect the wire?
- I connect the thread.
Are you sure that altering mentioned components wouldn't do any effect?
- If the alteration is minimal, for such simple circuits, there are no negative effects.
Could you design the pcb❤
Can you plz give the link of pdf of the procedure of construction and circuit diagram? I am getting problem in proteus.
Hi, towards the end of the video there is the circuit diagram with all the components. pdf manuals I have not realized
I'm curious about 1 thing, in the components list, you only state 1 red led, so is the power on led an option or a mod after you made the list, also if its after you made the list is the circuit diagram including this led and its resistor?
My mistake, when I wrote the component list on RUclips I didn't consider the Power LED
Instead the 1K resistor is already listed
the schematic is not working :D
Hi, the scheme works, the video shows it. Other people have built it and it works.. check that all the components are OK and and if you tested it on breadboard check that there are no broken tracks.
Funciona para detectar iones de oro y plata? Tienes esquema?
Hola, no funciona como un detector de metales, puedes ver el diagrama en 2:07 en el video.
I made this circuit and the LM386 is getting real hot. Your list of components says 2x2.2k resistors which are Red,red,red. But the one you made they look like they are Red,violet,red which would be a 2.7k. Is this a mistake?
Hi, no errors with the resistors, the 2.7K (or 2.2K both are fine) these resistors only work on the LM3914.
The LM386 must not get too hot, try to check all the components connected to the LM386, I think there is something wrong that makes it always work at 100%
@@Stefano91ste BTW, I got it working. I had a couple jumpers in the wrong place saturating the 386 just like you said.
is there a Gerbal file for this please.
I haven't drawn a PCB for this project yet
Nice, but sadly i cant look the .pdf in the link you provided
Hi, what kind of error do you have in the link?
Because it is working for me.
Alternatively, I inserted the same electrical diagram at the end of the video
Found out i need to alt click and 'save as', its working that way. Thanks
Thank you!
What kind of antenna did you use? Thanks!
Hi, It is a simple antenna retrieved from a router
@@Stefano91ste I see, thanks!
Hi,my circuit isn’t really working,would you be able to help me check my circuit if you would want to?Thanks anyways!!Love your content.
Hi, did you follow my circuit diagram? maybe some component is broken or wrong, exactly what does not work?
I am gonna attempt to build this. what is the function of the caps in the amp feed back loop?
Without that capacitor the input signal to the LM3914 is very erratic
Hi, when I pull up the spec sheet for the LM386 it says it is an low power audio amp, how is it detecting in the EMF range?
Hi, the antenna captures electromagnetic waves and the LM386 amplifies them to ensure that the LM3914 turns on the LEDs
Hi any luck on the GERBAL File on this yet please.?
When I make it I will post it on this channel :)
I wish i can have a emf
What kind of antenna did you use in the k2 meter?
Hi, I used the antenna of a router.. it works and is beautifully aesthetically.. but this is not the k2 meter, this is my version of an EMF detector/meter
Thank you for your respond and acctualy its almost the same thing
thank you
Can i use 3.7v lithium ion battrey ?
Hi, you need at least two 3,7v batteries in series, below 7 volts the circuit works badly.
Oi posso substituir os trimpot por potenciômetros??
Yes you can
I have a question, this emf detector can detect active cell phone?
If placed very close to a cell phone that is transmitting itself, but must be very close
@@Stefano91ste from this project is there any possible way to detect active cell phone in a exam hall if students bring cell phone in their pocket.
Unfortunately no, it would take something specific for cell phone frequencies
@@Stefano91ste u mean if we add something on this device its detect
It should be redesigned and created a new receiving circuit capable of identifying gsm 2g 3g and 4g .. it is quite complicated
Sir please reply me.
I DON'T HAVE a antenna. I did not purchase it. But I will make with 5mm copper wire a antenna. It works sir or not
Hi, yes, you can use copper wire
@@Stefano91ste OK thanks a lot sir
@@Stefano91ste awesome project sir
Hi, can I use a bigger antenna, so can I meausre electro-smog with it?
With a larger antenna it becomes more sensitive, however consider that it is not a precision instrument, so the measurements will not be precise
I have a question, do I have to program the chips or not?
Hi, no chips in this project need to be programmed, it's all analog electronics.
@@Stefano91ste so no programed , and it works 100% because I want to do it as a project to school I need a mark
I want to buy this one. Can you please help
Hi, I built this and put the diagram at the end of the video, it is not on the market. There are models like this on the market: www.banggood.com/custlink/3mmvBmCDbT
You have got pin 5 & 6 the wrong way around.
Hi, they are correct connected
Bom dia gostaria muito de saber se teria como instalar um mini Alto falante para quando atingir o nível máximo ele soar. Obrigada é tenha um bom dia.
Hola, puedes hacer esto conectando un buzer en paralelo al último LED rojo.
Wrong language...
Nice little circuit I just wish people wouldn't put that music in there videos!!! 1. I have to watch it on mute (cuz it is very annoying) and 2. I have to keep checking I didn't miss any instruction (mute-unmute-mute-unmute) that may or may not have been spoken-- very aggravating-
Hi, I thank you.
As for background music: it helps to make the video more pleasant, because I do not speak in my videos, but I explain everything through images and text.
A greeting
so do ghost det of an electric vibe through the emf??
No ghost :)
Can i use this meter for ghost hunting paranormal investigation? How cost to make it?
The cost should be around 15 $.. it depends on where you buy the components.
The tool is used to detect electromagnetic waves, I have no idea what ghosts can emit or be made :)
Can I ' use it for detecting UFO ? thanks
Hi, only if UFO emit electromagnetic waves
Hi, so this detector can be used to trace electrical wiring behind the wall? How to increase it's sensitivity if necessary?
Hi, if there is a current flow in the cables could detect them.. otherwise no, you need a metal detector
@@Stefano91ste I see. One more thing I noticed in your circuit at the end of the video: how could pins 2, 3, 4 of the LM3914 IC go to ground, i.e. the - of the battery and the same line goes to + of the battery, through main switch? Shouldn't this short out the battery?? I'm no expert, but correct me if I'm wrong.
NO! only pins 2 and 4 go to ground, the 3 goes directly to +
In the circuit diagram the junctions are marked by a dot :)
@@Stefano91ste lol I see now! :D
:)
have you tried to determine the frequency bandwidth response ?
Hi, not with precision
@@Stefano91ste Had read or seen vid where it said was primarily a low freq version.
This is true, but I have never tested the exact range accurately. When I designed this circuit I considered only that it was able to detect electromagnetic field produced by electrical equipment.
How do you build a tri-field meter and how much did this totally cost?
It depends on what you want to measure, and what components you use.. it's difficult to calculate the cost without precise information!
@@Stefano91ste I would like to collect natural emf
Have you designed a board for this yet, so we can order them?
Not yet, but I will make this project on PCB soon
@@Stefano91ste definitely vote you do, would love to get one
Do you sell these??
Hi, no I don't sell. At the end of the video you can see the circuit diagram if you want to build this EMF Meter
32 clicked dislike after trying this and learning Orgonite Pyramids don't block SHIT in the way of EMF. If you sleep in a Cave lined in 3 foot plastic, 6 feet concrete 9 feet lead you should be safe from the 5G monster. L💀L💀L💀L💀L💀L💀L💀L💀L💀L💀L
Many of those who press dislike don't leave a comment, that comment would be useful for me to understand what they didn't like... don't like the project? Don't like the fact that I don't speak in videos?
Android EMF App here: play.google.com/store/apps/details?id=com.mreprogramming.ultimateemfdetector&hl=en_US
Is it your hand made emf detector???
Hi, yes exact
Where did you get the outer case?
Hi, i found it on this site: www.futurashop.it/?gclid=CjwKCAjwmq3kBRB_EiwAJkNDp8MnsxgpD4ceb-NSYn8P1D1jsuQ79zFk-_yx6diFg-YGEuE7y3pryRoCb5gQAvD_BwE
But I think it can also be found on sites like amazon or banggood if you are not in Italy
Hi friend, could you show us the layout?
Hi, i built this circuit on a matrix board, you can see the elctric diagram in the end of the video
@@Stefano91ste Ok bro
I will soon be creating the PCB of this project with step-by-step video for the assembly
It sure will be cool
How can change the Led with meter?
Hi, I did not understand the question
You can use ADC at pin no 5 of lm3914 with clamper circuit and you can display it on LCD
nice work thank u bro.. can we add buzzer too?
Thank you!
Yes, It can be done
and how?
Just get a buzzer and connect it in parallel to the red LED. A buzzer like this: images.app.goo.gl/y8fVb1Ehd8MuVXAa6
@@Stefano91ste i made this.. pasteboard.co/Ie3Bj8c.jpg ... but all leds flashing same time.. not cascaded like yours.. any idea?
edit:pasteboard.co/Ie3DlQE.jpg
pasteboard.co/Ie3JFBV.jpg
pasteboard.co/Ie3JUg8.jpg
pasteboard.co/Ie3K8pj.jpg
all trimmer variants tried...
Ciao, vabene lo stasso lm3914n?
Ciao, Si va bene, sono praticamente lo stesso integrato :)
Is this app free? Can anyone tell me. I've checked every where.
Hi, which app are you referring to? the one you see in my other video where I compare this meter with an app meter, yes it's free
It's beautiful, but detection range is not good.
it is a project that will be improved in the future
does this actually work? please i want to know
Yes my EMF meter it still works fine today
@@Stefano91ste okay thank you
Who’s here from phasmhobia?
can u test it to detect underground cable?
YES, If it is not too underground
@@Stefano91ste how if about 3meter? It can be detected?
No it's too much.. Unless the cable emanates so much electromagnetic radiation it is impossible for this tool to detect it.
You need a metal detector.
@@Stefano91ste so.. if i change the antenna to metal detector it may detected? the cable I want detect is 1000V cable line.
It is not enough to change the antenna, a metal detector has another type of circuit