Kudos for building your own project. Not for the squeamish! However, I would suggest that you do a search on a thing called "nulling" a circuit. The TX vs. the RX coils need to have a null point balance. You were having problems adjusting that sensitivity side to side due to an incorrect coil design. You've made what is known as a Double D coil, (also known as DD, for obvious reasons). The sensitive area SHOULD be in the area where they overlap. I noticed yours has sensitivity in the center of each side, not how a detector with DD coil should work. You should try doing a concentric coil. One circle with a smaller circle inside. keep your wire lengths the way the circuit was intended but make a tighter circle with either the RX or the TX coil. That will center up the detection area. Keep it up, you are on the way to greatness!
I am betting an NE567 phase lock loop IC would work really well as it can generate and decode its own signal. I have not seen a design for it but it would be easy to try. You know when it is all working well as you will detect an object that is as far away as the coil diameter. You should consider using a good voltage regulator as your circuit will drift as the battery voltage changes. Great work as usual.
Robonza Hey good news! I just checked my IC hoard and I have 12 SE567N chips!!! I'm going to have to do some research on this chip. Seems like it could be useful and since I have 12... The only thing I could find regarding metal detectors using this chip was this: www.seekic.com/circuit_diagram/Basic_Circuit/PLL_DETECTOR_FOR_ALL_METALS.html However it uses a slightly different chip, the NE656. I'm not sure how different these chips are. Maybe it's a small enough difference that they would be interchangeable. If you could find that circuit that would be great. Yeah the range is still really poor on it. I was thinking about adding a voltage regulator. If I was using 9 volt batteries I'm sure I would need one as the voltage would drop pretty quick. I think running on this 9 volt pack it wouldn't be much of a problem expect for the first 10 minutes when the batteries are still stabilizing. They are 1500mha batteries so technically at a 10ma discharge they should last around 150 hours. So I think the drift would be very minimal. But still something I may add. Thank you!
Makerj101 I looked for a cct using a 567 and did not find any. I used the 567 for a super sensitive photo sensor so I think you could do the same thing for a metal detector. I can help with the schematic etc. You can skype me if you want and work through it. The voltage regulator is needed as when you tune a cct and the battery volatge drops 0.1v your cct is not tuned anymore. This cct is similar-search 567 in this ams.com/eng/content/download/250430/976493/file/TSL262_Datasheet_EN_v1.pdf swap the photo sensor and led for the two coils. I would think you would need a buffer transistor to the TX coil and an opamp for the RX coil.
Robonza Hmm I could try that. Thanks! Maybe we could skype sometime. I'm really eyeing up this circuit right now: ua-cam.com/video/GRXq-BEHBlE/v-deo.html It looks a ton simpler, uses the most common transistors, and looks like is has tons better rang than mine. First I want to hook my oscilloscope up to mine and see if I can't tune it better. If I can't get at least 4 inches of range on a quarter then I'm switching to a different circuit. Either one using the SE567 or all transistor.
Thats a nice simple design. I have looked into this before and not found anything so easy. Most of the Designs I have seen use a PLL chip. I wonder if you could decipher which coil has the metal near it and have stereo buzzers for finer location acuracy.
Have you hooked up the coil from your Ace 250 to this circuit? Then you could tell if the problem was in the coil or in the circuit. It would make a good vid to show the results.
Thanks for your video, really helpful! Can you please tell me one thing about those chips (e.g. TLC556CN): are they out-of-box ready for making a metal detector, or they need additional programming? Also about other parts, can I simply buy them in electronics store and expect my metal detector to work? Thanks in advance, keep up the good work!
The file in the description states that the circuit can distinguish between ferrous and non-ferrous metals. However, the manner in which it's indicated to the user remained unspecified. Does the piezo sounder emit a different pitch depending on the type of metal entering the field? Or is there another way that the circuit indicates that the metal is ferrous? Thanks in advance!
I just got interested in metal detectors, like, last week! And this pops up! It's kismet I tell ya! BTW, I'm all fired up to make a PI detector. But a lot of DIY stuff I find is "explained" by people who don't seem to understand what they're talking about very well. Don't get me wrong, most of them come right out and say it up front! So I decided to buy an oscilloscope and try stuff for myself. I figure the Rigol DS1054Z costs about as much as an entry-mid level detector, but with it I could make one for next to nothing and be left with a "free" oscilloscope.
You really need an oscilloscope or signal tracer to adjust the coil positions properly. It should be most sensitive under where the two coils overlap. In fact, looking at the output on a dual channel 'scope and comparing it to the pulses from the first timer section, you should be able to tell the difference between magnetic metal like iron, steel, and nickel, as compared to nonferrous metals like silver, gold, copper, zinc, etc.
Hi all. I made the metal detector using the same documents. But I was not satisfied. Because although I use copper wires and coils of different diameters, the result is the same. Its effective range is up to 10 centimeters (4 inches). He sees metal coins from a distance of 2-3 cm (1 inch). This detector reacts well to large pieces of iron and aluminum. Also, instead of copper wire, I tried with aluminum enamelled wire (110 turns with a diameter of 0.5 mm), which I removed from the old type television, it works similarly.
E Isad Thank you! Yeah I might try something like that. I need to hook it up the oscilloscope and see what exactly makes the circuit tick. Then I can figure out how to tune it and add more amplification etc. Thanks!
You know to make the RX and TX coils easier you can maybe get away with using a CRT degaussing coils which are already wound and taped, you just need to add the bare copper and cage to it. I remember building things like this when I was in tech school back in high school.. I finally just bought a proper detector.
ElfNet Gaming Yeah I thought about it. My initial tests were using degassing coils too. One problem is finding two that are exactly the same. I have a lot of them but I don't think I've ever taken two monitors/TVs apart that were the same. Hahaha yeah! Well maybe down the road when I have more money I'll buy a professional one. But for now homemade is going to have to do!
OK, so it seems to use a threshold detector. It's a bit like a very small radar. I've read up on another design that uses pulse induction that seems to not be affected by ground mineralization as much but I think the circuit would be a bit more advanced.
+Nasser Samim You might be able to. I haven't tried it so I have no clue. But in theory it should work just fine. Give it a try and let me know how it works for you.
The article says that it won't work with the old TTL NE555 or NE556, but must instead use the CMOS version. So you could use two ICM7555 or two TLC555 timers, because those are CMOS versions of the 555 timer. However, looking at the schematic, I can't see why it would not work with an NE555 or NE556. The first 555 section is just an astable, the second is merely acting as an inverting schmitt trigger.
That's odd that yours isn't working in the middle but works on the ends where as my assembly works in the middle but not very well on the outsides..Il post my project today.
science Vlog I got it from an old control board of some kind. 555 and 556 timers are really hard to find in consumer electrics unless it's a really old device.
science Vlog Mouser Electronics online.. also with other parts suppliers online, they are not that hard to find if you buy them new. Now trying to salvage them thats a different story because MOST consumer devices do not use them due to lack of efficiency and circuit space constraints when they can use a micro-p to do everything in one package. Now some kids toys and such would have them but even those are rare as hens teeth now.Some OLD first gen thermostats and digital timers may have them also. I have also found them in OLD carbon monoxide detectors and smoke detectors. Some 2-way radio repeater controllers also use a CMOS type 555 or 556 timer IC either surface mount or through hole depending on if its for commercial or ham radio markets. The commercial grade types will be surface mounted.
science Vlog You know man, I wouldn't bother with this circuit. eucalyptux suggested this circuit: ua-cam.com/video/GRXq-BEHBlE/v-deo.html It's a ton simpler and looks like it works a ton better. It also uses some of the most common transistors. Best wishes,
I will try to make that with transistors some time just make simple oscilator and for detector will use zener diode or silicon diodes i think it shoud work
JOSIP Žlk also I think if you put higher gain amp to replace that transistor and tune the detector part so it matches it shoud be more sensitive beacouse it will detect smaller changes in the field...
Kman Meteor Yeah a about 2-3 inches. But I'm hoping it will be better once I tune it more. I'm not using the same transistor that the plans suggested so I may need to use different values of other components as well.
Jordan O'C Hahaha but technically the principle is pretty solid. The radio acts as the receiver, threshold detector, amplifier, and audio output. Multiple birds with one stone. But I'm not sure how good the ground penetration would be at AM frequencies.
Makerj101 True. I have literally no clue about the ground penetration of AM frequencies.. I know high frequencies like 2.4GHz (RC transmitters) can't go through anything, not even water, but old 75MHz can. I'm sure you can pick up an old AM radio somewhere :)
***** Thanks! Hahaha I saw the ough and figured it would be pronounced like the ough in Pittsburgh... LOL I'm honestly not even sure how I made that connection. Look, lets just say I don't have over 6,000 subscribers because of my grammar, pronunciation, spelling, reading, or English skills in general. LOL But I do try.
***** That's cool! Must be nice having a dad who's got and electrical degree! My dad is a materials engineer. He did have some electrical classes though. I would look into this circuit before you have him build it. It's a lot simpler, uses the most common transistors, and looks like is has tons better rang. Give it a look: ua-cam.com/video/GRXq-BEHBlE/v-deo.html Best wishes,
+aek abdelkader This is where I bought mine: www.digikey.com/product-detail/en/ICM7556IPDZ/ICM7556IPDZ-ND/821489 I've heard that they SNE556N does not work very well in this circuit. But to know for sure you would have to try it.
Thomas Who? LOL. How do you read/ pronounce Scarborough? It is not that hard is it. Say what you see. Its not Sirborg. You make it sound like a character out of Star Trek.
Kudos for building your own project. Not for the squeamish! However, I would suggest that you do a search on a thing called "nulling" a circuit. The TX vs. the RX coils need to have a null point balance. You were having problems adjusting that sensitivity side to side due to an incorrect coil design. You've made what is known as a Double D coil, (also known as DD, for obvious reasons). The sensitive area SHOULD be in the area where they overlap. I noticed yours has sensitivity in the center of each side, not how a detector with DD coil should work. You should try doing a concentric coil. One circle with a smaller circle inside. keep your wire lengths the way the circuit was intended but make a tighter circle with either the RX or the TX coil. That will center up the detection area. Keep it up, you are on the way to greatness!
I am betting an NE567 phase lock loop IC would work really well as it can generate and decode its own signal. I have not seen a design for it but it would be easy to try. You know when it is all working well as you will detect an object that is as far away as the coil diameter. You should consider using a good voltage regulator as your circuit will drift as the battery voltage changes. Great work as usual.
Robonza Hey good news! I just checked my IC hoard and I have 12 SE567N chips!!! I'm going to have to do some research on this chip. Seems like it could be useful and since I have 12... The only thing I could find regarding metal detectors using this chip was this: www.seekic.com/circuit_diagram/Basic_Circuit/PLL_DETECTOR_FOR_ALL_METALS.html However it uses a slightly different chip, the NE656. I'm not sure how different these chips are. Maybe it's a small enough difference that they would be interchangeable. If you could find that circuit that would be great.
Yeah the range is still really poor on it. I was thinking about adding a voltage regulator. If I was using 9 volt batteries I'm sure I would need one as the voltage would drop pretty quick. I think running on this 9 volt pack it wouldn't be much of a problem expect for the first 10 minutes when the batteries are still stabilizing. They are 1500mha batteries so technically at a 10ma discharge they should last around 150 hours. So I think the drift would be very minimal. But still something I may add.
Thank you!
Makerj101 I looked for a cct using a 567 and did not find any. I used the 567 for a super sensitive photo sensor so I think you could do the same thing for a metal detector. I can help with the schematic etc. You can skype me if you want and work through it. The voltage regulator is needed as when you tune a cct and the battery volatge drops 0.1v your cct is not tuned anymore. This cct is similar-search 567 in this ams.com/eng/content/download/250430/976493/file/TSL262_Datasheet_EN_v1.pdf swap the photo sensor and led for the two coils. I would think you would need a buffer transistor to the TX coil and an opamp for the RX coil.
Robonza Hmm I could try that. Thanks! Maybe we could skype sometime. I'm really eyeing up this circuit right now: ua-cam.com/video/GRXq-BEHBlE/v-deo.html It looks a ton simpler, uses the most common transistors, and looks like is has tons better rang than mine. First I want to hook my oscilloscope up to mine and see if I can't tune it better. If I can't get at least 4 inches of range on a quarter then I'm switching to a different circuit. Either one using the SE567 or all transistor.
Robonza I wonder if I don't have my resonance frequency right. I'll try some different capacitor values and see if that helps at all. Thank you!
Impressive work young man, well done.
Thank you for making videos. I really enjoy them!
Nate Jon You're welcome! I'm glad you like them! I enjoy making them! :)
Thats a nice simple design. I have looked into this before and not found anything so easy. Most of the Designs I have seen use a PLL chip. I wonder if you could decipher which coil has the metal near it and have stereo buzzers for finer location acuracy.
Mongrel Shark I don't know. It's an interesting idea
Have you hooked up the coil from your Ace 250 to this circuit? Then you could tell if the problem was in the coil or in the circuit. It would make a good vid to show the results.
Thanks for your video, really helpful!
Can you please tell me one thing about those chips (e.g. TLC556CN): are they out-of-box ready for making a metal detector, or they need additional programming? Also about other parts, can I simply buy them in electronics store and expect my metal detector to work?
Thanks in advance, keep up the good work!
Excellent video, one ask , how to build a metal detector
to differentiate ferrous metals from non-ferrous metals?
THANKS!.
The file in the description states that the circuit can distinguish between ferrous and non-ferrous metals. However, the manner in which it's indicated to the user remained unspecified. Does the piezo sounder emit a different pitch depending on the type of metal entering the field? Or is there another way that the circuit indicates that the metal is ferrous?
Thanks in advance!
I just got interested in metal detectors, like, last week! And this pops up! It's kismet I tell ya!
BTW, I'm all fired up to make a PI detector. But a lot of DIY stuff I find is "explained" by people who don't seem to understand what they're talking about very well. Don't get me wrong, most of them come right out and say it up front! So I decided to buy an oscilloscope and try stuff for myself. I figure the Rigol DS1054Z costs about as much as an entry-mid level detector, but with it I could make one for next to nothing and be left with a "free" oscilloscope.
ترجمة من فظلك واسماء القطع المستعمل لصنع هذ الجهاز
You really need an oscilloscope or signal tracer to adjust the coil positions properly. It should be most sensitive under where the two coils overlap.
In fact, looking at the output on a dual channel 'scope and comparing it to the pulses from the first timer section, you should be able to tell the difference between magnetic metal like iron, steel, and nickel, as compared to nonferrous metals like silver, gold, copper, zinc, etc.
Very good video 👌👌👍👍👍👏👏🙏💐💐🌹
can you make video about how to make the circuts please?
Question, what's the maximum current that this circuit can hold ?
and the voltage too
Hi all. I made the metal detector using the same documents. But I was not satisfied. Because although I use copper wires and coils of different diameters, the result is the same. Its effective range is up to 10 centimeters (4 inches). He sees metal coins from a distance of 2-3 cm (1 inch). This detector reacts well to large pieces of iron and aluminum. Also, instead of copper wire, I tried with aluminum enamelled wire (110 turns with a diameter of 0.5 mm), which I removed from the old type television, it works similarly.
Great design.
But could you amplifie the transmit coil
with some transistors.That would prob give more distance out of that circuit?
E Isad Thank you! Yeah I might try something like that. I need to hook it up the oscilloscope and see what exactly makes the circuit tick. Then I can figure out how to tune it and add more amplification etc. Thanks!
Np.Looking foward to see this work on high sensitvity.
You know to make the RX and TX coils easier you can maybe get away with using a CRT degaussing coils which are already wound and taped, you just need to add the bare copper and cage to it.
I remember building things like this when I was in tech school back in high school.. I finally just bought a proper detector.
ElfNet Gaming Yeah I thought about it. My initial tests were using degassing coils too. One problem is finding two that are exactly the same. I have a lot of them but I don't think I've ever taken two monitors/TVs apart that were the same.
Hahaha yeah! Well maybe down the road when I have more money I'll buy a professional one. But for now homemade is going to have to do!
The BFO types work very well with greater distance.
It can detects gold?
What happens if we add transistors to both tx and rx?
With this circuit. how many detect inches deep?
Interesting design! Thnx for sharing ;)
OK, so it seems to use a threshold detector. It's a bit like a very small radar. I've read up on another design that uses pulse induction that seems to not be affected by ground mineralization as much but I think the circuit would be a bit more advanced.
Rouverius Yeah that's it! Cool! I may try some more designs if I can't get this one working well enough.
Hi, how are you! Congratulation about your video, let me ask about metal discrimination, is possible select the material as iron and silver/gold?
Very interesting. It would be very useful In the woods.
it should detect only near the center region (not sides).
great job Makerj101 continue
Hi , my friend can I use two NE555 timer instead of ICM7556IPD if I can use would you please Help me
Plzzzzzz reply me
+Nasser Samim You might be able to. I haven't tried it so I have no clue. But in theory it should work just fine. Give it a try and let me know how it works for you.
tnx my best I will test it
The article says that it won't work with the old TTL NE555 or NE556, but must instead use the CMOS version.
So you could use two ICM7555 or two TLC555 timers, because those are CMOS versions of the 555 timer.
However, looking at the schematic, I can't see why it would not work with an NE555 or NE556. The first 555 section is just an astable, the second is merely acting as an inverting schmitt trigger.
Could you share the name of component and the sceme and total inductor
How deep is the measurement underground?
That's odd that yours isn't working in the middle but works on the ends where as my assembly works in the middle but not very well on the outsides..Il post my project today.
Does this work for both ferrous and non-ferrous metals?
no !! only non-ferrous
Less than 2 inches is no good for anything but surface finds. Make it more sensitive and then make another video with the "final" product, that works.
It's just a prototype.
You fund him he'll do good.
where did you get the 556 chip
science Vlog I got it from an old control board of some kind. 555 and 556 timers are really hard to find in consumer electrics unless it's a really old device.
science Vlog Mouser Electronics online.. also with other parts suppliers online, they are not that hard to find if you buy them new. Now trying to salvage them thats a different story because MOST consumer devices do not use them due to lack of efficiency and circuit space constraints when they can use a micro-p to do everything in one package. Now some kids toys and such would have them but even those are rare as hens teeth now.Some OLD first gen thermostats and digital timers may have them also.
I have also found them in OLD carbon monoxide detectors and smoke detectors.
Some 2-way radio repeater controllers also use a CMOS type 555 or 556 timer IC either surface mount or through hole depending on if its for commercial or ham radio markets. The commercial grade types will be surface mounted.
Makerj101 will some thing like a tl494 work, or some type of pwm chip
ElfNet Gaming okay ill get some old smoke detectors then tho i dont think it might be worth my time; might just order it.
science Vlog You know man, I wouldn't bother with this circuit. eucalyptux suggested this circuit: ua-cam.com/video/GRXq-BEHBlE/v-deo.html It's a ton simpler and looks like it works a ton better. It also uses some of the most common transistors. Best wishes,
I will try to make that with transistors some time just make simple oscilator and for detector will use zener diode or silicon diodes i think it shoud work
JOSIP Žlk also I think if you put higher gain amp to replace that transistor and tune the detector part so it matches it shoud be more sensitive beacouse it will detect smaller changes in the field...
Makerj101 what's the farthest distance away from metal can it detect metal?
Kman Meteor looks like about three inches
Kman Meteor Yeah a about 2-3 inches. But I'm hoping it will be better once I tune it more. I'm not using the same transistor that the plans suggested so I may need to use different values of other components as well.
Makerj101 thanks.
-Kyle
1:58 comparator is the word?
Great job!
Why not use an AM radio like all the cool kidz?!?!?1/1!!!!??/
It's really cool that you're making you're own metal detector, that's pretty neat man.
Jordan O'C I saw some of the AM radio ones. I might try one. They look much easier. Thank you!
Makerj101 Oh god, please don't use one of them haha.
Jordan O'C Hahaha but technically the principle is pretty solid. The radio acts as the receiver, threshold detector, amplifier, and audio output. Multiple birds with one stone. But I'm not sure how good the ground penetration would be at AM frequencies.
Makerj101 True. I have literally no clue about the ground penetration of AM frequencies.. I know high frequencies like 2.4GHz (RC transmitters) can't go through anything, not even water, but old 75MHz can.
I'm sure you can pick up an old AM radio somewhere :)
Jordan O'C Yeah I'm not sure either. I guess there's only one way to find out! :D Yeah I have a couple portable AM radios.
LOL how did you pronounce Scarborough???? (1:11)
Are you going to Scarborough Fair?
How to make metal director Sir
U should make a full tutorial of how to make this
FaZePVP GFX I may. It depends on whether I can get it working well. How it's working right now, it would not be worth it.
bless him for trying lool bro the resistors you see there are variables but they aren't variable lol XD
which the diameter of the coil wire?
he said in page 4 .. coil is 120 mm in diameter
gold?
Excellent work but the way you pronounced "Scarborough" is wrong it's pronounce "Scar-bur-row" like the Scarborough Fair song.
***** Thanks! Hahaha I saw the ough and figured it would be pronounced like the ough in Pittsburgh... LOL I'm honestly not even sure how I made that connection. Look, lets just say I don't have over 6,000 subscribers because of my grammar, pronunciation, spelling, reading, or English skills in general. LOL But I do try.
I know, I'm getting my Dad to make this circuit for me (he's the one with the degree in Electrical Engineering,) It's cool.
***** That's cool! Must be nice having a dad who's got and electrical degree! My dad is a materials engineer. He did have some electrical classes though. I would look into this circuit before you have him build it. It's a lot simpler, uses the most common transistors, and looks like is has tons better rang. Give it a look: ua-cam.com/video/GRXq-BEHBlE/v-deo.html Best wishes,
Test with gold please
i want ask you my friend i no find TLC556CN i find SNE556N i no know if workin please hellp me and i see in schema ici 7556 cam you hellp me please
+aek abdelkader This is where I bought mine: www.digikey.com/product-detail/en/ICM7556IPDZ/ICM7556IPDZ-ND/821489 I've heard that they SNE556N does not work very well in this circuit. But to know for sure you would have to try it.
+aek abdelkader عبد القادر عليك بالقراصنة الروسي فهو سهل جدا
How much you want
i want you hellp me whitch one the best circuit
+aek abdelkader I would recommend this circuit because it's so simple: ua-cam.com/video/GRXq-BEHBlE/v-deo.html
here manual :) ciao www.geotech1.com/pages/metdet/projects/matchless/matchless300c.pdf
Ciao :) www.next.gr/sens-detectors/metal-detector-circuits/Induction-Balance-Gold-Metal-Detector-Circuit-l60669.html
Totally waste of time.
Thomas Who? LOL. How do you read/ pronounce Scarborough? It is not that hard is it. Say what you see. Its not Sirborg. You make it sound like a character out of Star Trek.