SBG- slow motion metal detector

[scs-bg]

Don't waste your time. You need to make a sensor with shielded coils and minimal received signal. Then remove the capacitor c33 10 nanofarads. In its place, put one or two capacitors that give the maximum received signal without moving the coils relative to each other. Try with a piece of ferrite, a small change of c33 may be necessary. A signal from any metal should be received when entering the sensor. If the signal is when leaving, swap the beginning and end of one of the coils.

[scs-bg]

[scs-bg]

I have a new hobby. I'm tired of dealing with circuit boards and soldering irons.

[ivconic]

Don't waste your time. You need to make a sensor with shielded coils and minimal received signal. Then remove the capacitor c33 10 nanofarads. In its place, put one or two capacitors that give the maximum received signal without moving the coils relative to each other. Try with a piece of ferrite, a small change of c33 may be necessary. A signal from any metal should be received when entering the sensor. If the signal is when leaving, swap the beginning and end of one of the coils.

Sasho I know most of this. Thanks anyway. I tried a shielding with thin Aluminum self adhesive tape and it breaks on many places, very bad quality. So next time I will use graphite spray instead.
It's been a long time since I made any diy coils, in tne meantime I didn't maintain my supplies of material.
Last 12-15 years all I made; I used various stock coils. Just because of the reason I hate making coils.
In the past, the aluminum self adhesive tape I remember; was of much better quality. Today they sell garbage.
This time I wanted to make coil just for the reason it is "OO" shape. It is interesting to me to experiment.
Once in the past I made one "OO" coil and it was good. But the aluminum self adhesive tape was of the highest quality, so it was easy.
During the TGSL/IGSL/SMW period I made 200-300 coils (lost count). Hopefully I learned something than!?

This is just a hobby. I do have dozen top metal detectors in my collection. I am not striving to make a detector as soon as possible and to use it for real, this is just a nice project and interesting to kill a time.
Same as you; I am also pretty much tired of dealing with such stuff. It was too much for a lifetime.
But... it's under my skin, too late to change and give up.
Hobby will remain as much as I live, for sure.

[ivconic]

And just when I started to slowly withdraw and move away from "physical jobs", this happened:
https://www.geotech1.com/forums/foru...ler#post450236
how can I resist now?

[ivconic]

I have a new hobby. I'm tired of dealing with circuit boards and soldering irons.

From a young age, I dreamed of being a fighter-bomber pilot.
But I was rejected at school because I'm an "only child", I don't have any direct brothers or sisters.
And the law then strictly stipulated that only someone who had brothers and sisters could enter the school for pilots.
(in case of death, so that the parents are not left without children).
So I was denied that desire for life.
My two uncles were pilots, my father was a paratrooper... you can imagine how disillusioned and demotivated I was later in life!
But I replaced it with love for powerful motorcycles.
It's not the same feeling, but it's similar.
In the next couple of years, when I finish some real estate business, I plan to buy a 200 horsepower Suzuki Hayabusa and then cruise around Europe.
Seems crazy?
At 60 years old!?
No it's not!
50 years of life is the right age to get on a powerful motorcycle.
All the younger ones are just there to do stupid things and get killed.
Your airplane collection reminded me of my first love... which didn't come true.
MIG29 was my dream, the pinnacle that can be achieved.
I had the opportunity to sit in one for 5 minutes.
In the airplane museum... of course!

[scs-bg]

I understand that we had the same desires. When a person is young, he has an interest in airplanes, space, ships. It stays for life. By the way, I am very satisfied with the Bulgarian doctors. After the operation, I feel good.

[nejdet]

I understand that we had the same desires. When a person is young, he has an interest in airplanes, space, ships. It stays for life. By the way, I am very satisfied with the Bulgarian doctors. After the operation, I feel good.

It's important to stay positive! I also had an operation with organ loss...now I'm in perfect condition!

[ivconic]

I understand that we had the same desires. When a person is young, he has an interest in airplanes, space, ships. It stays for life. By the way, I am very satisfied with the Bulgarian doctors. After the operation, I feel good.

Glad to hear that!
Rest for a while and next year let's go Europe tour on bikes!
Let the youngsters do the rest.

[ivconic]

It's important to stay positive! I also had an operation with organ loss...now I'm in perfect condition!

Oh, don't get me started!
I'm so full of scars that women think they're tattoos!
Life lesson: always (mis)use all your flaws!

[pito]

From before, xx years ago, when I did a lot of coils for TGSL/IGSL...
I know from experience that the inductance of the coils changes significantly when the windings are brought close together and tightened with thin string, or wrapped with tape.
In this case, they are coated with superglue.
And it is very difficult to predict the final inductance.
It's one thing when the windings are just wound and the other is when they are tightened and arranged.
Of course, resonance can be fixed with capacitors.
But the difference of 0.6mH does not seem like a good minimum "jitter" to me and I will try to wind better and more precise coils.

I made a lot of coils (maybe 100), I'm not too concerned with the exact number of turns and inductance... I just placed a capacitor more or less in the transmitter coil, adjusted the transmitter frequency to it (only one capacitor in the transmitter coil), and then adjusted the receiver capacitor to achieve resonance.