Can pinpointer detecting thin chain?

[Eugen]

Hi Nupi!
I made a test as well. This is the maximum stable.

https://www.youtube.com/watch?v=QYYuXx89XVI&feature=youtu.be

[Eugen]

Hi Nupi!
The coils 250/150 running 0.2 / 0.4 mm, ferrite 10mm x 800mm.
The capacitors C1 = 1nF (MKT) C2 = 10 nF (MKT)
R1 = 1K potm.
R2 = 100kOhm potm.
R3 = 2.2 Kohm potm. (1.65 Kohm a stable point)

Nupi Thanks for your help!

[Nupi]

......................Otherwise the clicker trick for improving sensitivity wouldn't work.....................

That's what I mean. when I said in # 217 that it'd be difficult to maintain the sensitivity.

[Nupi]

"So how about a push button stabilisation." -It is a cool idea! May be for water I can add automatic push every 10 second because anyway I can't reach it in water.

I love automatic automatic

[Nupi]

I thought of the automatic tuning for a pinpointer, but then I realised that even the commercial ones are doing it kinda semi-automatic. Otherwise the clicker trick for improving sensitivity wouldn't work. When you switch it on it goes into a ~2 seconds cycle of self-tuning, and then it is ready. Point is that if you let the stabilising circuitry do it's thing all the time, you in effect get a motion compensated device. If you go with extremely slow motion compensation, it takes forever till it stabilises. So how about a push button stabilisation. In a way it would provide some kind of ground balance as well.

********************GREAT********************

[Nupi]

Hello
I also built the pinpointer as hadrianus colleague (min Hungarian) and I had a stability problem.
The R3 resistance trimmer potentiometer I changed and became stable.
The HUF 1 45 - 50 mm to detect.
It has been a good pinpointer.
Thank you everyone!

Hi, Eugen.


You say R3 but you mean R1 or R2?
What did you change?


It's very good 40-50mm for 1 Forit.But maybe it's possible to get more than that, maybe 75mm.


I have no 1Forit but I have tried with 10 Dutch cents from 1954.
Detected at 85 mm.


Can you tell me what kind of coil you have made and what kind of capacitor
you use for C1 and C2? ( mkp or mkt....)
]

[Eugen]

[Quote = Davor, 187847] I thought of the automatic tuning for a pinpointer, but then I realised that even the commercial ones are doing it kinda semi-automatic. Otherwise the clicker trick for improving sensitivity wouldn't work. When you switch it on it goes into a ~2 seconds cycle of self-tuning, and then it is ready. Point is that if you let the stabilising circuitry do it's thing all the time, you in effect get a motion compensated device. If you go with extremely slow motion compensation, it takes forever till it stabilises. So how about a push button stabilisation. In a way it would provide some kind of ground balance as well. [/ Quote]
I'm waiting for the auto-tuning.
I think everyone interested. Publish!

[Waikiki_Sweep]

I thought of the automatic tuning for a pinpointer, but then I realised that even the commercial ones are doing it kinda semi-automatic. Otherwise the clicker trick for improving sensitivity wouldn't work. When you switch it on it goes into a ~2 seconds cycle of self-tuning, and then it is ready. Point is that if you let the stabilising circuitry do it's thing all the time, you in effect get a motion compensated device. If you go with extremely slow motion compensation, it takes forever till it stabilises. So how about a push button stabilisation. In a way it would provide some kind of ground balance as well.

"So how about a push button stabilisation." -It is a cool idea! May be for water I can add automatic push every 10 second because anyway I can't reach it in water.

[Davor]

I thought of the automatic tuning for a pinpointer, but then I realised that even the commercial ones are doing it kinda semi-automatic. Otherwise the clicker trick for improving sensitivity wouldn't work. When you switch it on it goes into a ~2 seconds cycle of self-tuning, and then it is ready. Point is that if you let the stabilising circuitry do it's thing all the time, you in effect get a motion compensated device. If you go with extremely slow motion compensation, it takes forever till it stabilises. So how about a push button stabilisation. In a way it would provide some kind of ground balance as well.

[Eugen]

Hello
I also built the pinpointer as hadrianus colleague (min Hungarian) and I had a stability problem.
The R3 resistance trimmer potentiometer I changed and became stable.
The HUF 1 45 - 50 mm to detect.
It has been a good pinpointer.
Thank you everyone!

[bernte_one]

oh ok, there are some people who have big fun in diy electronics
so i will do

most projects need a while to get started right,
i think at moment the most hobbybuilders are out to detecting
if the weather i bad for a longer period they go in their hobbylabs and solder i´m sure

thanks nupi

[Nupi]

hello nupi

if it is ok for you i would load the project files to german detektorforum

Hi, that does not matter to me, but if you find for yourself fun to do it,
I have no problems with it.
Vielen Dank für Ihr Angebot

[Nupi]

Dear Nupi,

Please do not be disappointing with low attention to your project....................

WS

Hi, I'm not disappointed, I thought that there were more people doing DIY electronics.
My intention is not to create a kit. For that I need to invest a lot of time and
my health does not always allow.


In the first place I thought of the people who can not pay a Expensive pinpointer.
I've been trying to build a cheap and simple pinpointer with reasonable performance that no board need
and it even does well on breadboard.

[bernte_one]

hello nupi

if it is ok for you i would load the project files to german detektorforum

[Waikiki_Sweep]

Dear Nupi,

Please do not be disappointing with low attention to your project. It is just because visitors traffic on Geotech is very low.
If you really want to spread your pinpointer idea it will require much more work.

Firrst you need to build some website from where you will let people to order kits. (Like Silverdog did.)
Than register on every MD forum and spread a news (Like Silverdog did.)
So you will see some interest to your invention rising.
Also there is eBay to put something on sale. But it is slow too.

Please do not expect much because anyway DIY niche capacity is very limited.
(You can ask Silverdog why his website is not growing much.)
Most of detectorists are dumbs in electronic and they will never risk to assemble something.
They will only buy finished product and from well known brand and with some warranties.

With Best Regards!

WS