Pinpointers TOPIC

[waltr]

I want to do a pinpointer, I have prepared this PCB but I don't know if it will work, has anyone tried it?

Any other recommended pinpointer?

Thx

I use Teemo's circuit for a pinpointer. Works well and discriminates between ferrous and non-ferrous.

https://www.geotech1.com/forums/showthread.php?19935-My-Pulse-Oscillation-detector-project

My take is this post:

https://www.geotech1.com/forums/showthread.php?19935-My-Pulse-Oscillation-detector-project&p=241483#post241483

[Funfinder]

Don't waste you time and get the 2in1 Nokta Makro Pulse Dive.
Its also super to pinpoint deep finds on or below land.

[berreizeta]

I want to do a pinpointer, I have prepared this PCB but I don't know if it will work, has anyone tried it?

Any other recommended pinpointer?

Thx

[Andi68]

Whats up?

[berreizeta]

Hi, can anyone tell me something about this pinpointer?

[Funfinder]

Before creating a "sharp" tip for my Whites Pinpointer out of some plastic tube plus soldering iron I did break off the edges of the ferrite so the tip is more round. The copper windings are starting almost direktly there so I had to be cautious.

For getting maximal detection distance near the tip move the coil windings near there or cut the ferrite.

For making it more perfect first sharpen the ferrite-tip carefully because this stuff is fragile and next wind the coil directly over there.

A "half-sharp" tip is much better for pressing the pinpointer into the ground as a flat one and if you dig out some old vampire you can push your "plastic-dagger" into his black heart!

[Skippy]

I doubt any retuning will be needed, the pinpointer probably detects changes in oscillator amplitude, not small frequency changes. You could also try moving the coil along the ferrite rod to see if that slightly improves sensitivity, you just need to note the original position in case you have to 'restore' it. Good luck.

[Rolle]

Thanks a lot!

Don't know how good contact there will be between the rod and additional pieces of ferrite, but testing how it works costs nothing (although I probably have to break down some old radios to get ferrite rods for testing )

Do I have to fine tune my pinpointer after I alter the length of the ferrite rod?

[Skippy]

To sharpen or not - a good question. I would compromise and half-sharpen. I dont think you will gain too much from the extra 5mm of 'point', and if it turns out to be a disaster you can easily square-off the end of the rod again without much loss of length. Alternatively you could try glueing a small ferrite bead etc on the end of the rod - it might help a bit. Hope this helps.

[Rolle]

Hello all!

I'm planning to build a new stronger casing for my old trusty pinpointer. In my opinion an ideal pinpointer should have a sharp tip so you can stick it into the ground and search for shallow coins even without any digging. For this reason I'm going to use a plastic (PE) 15 ml test tube ( http://images.daigger.com/view/1/dai...mages/4661.jpg ) as the blade of my new probe.

But here comes the problem: as the test tube is canonical and my ferrite rod is not, the ferrite rod is not fitting to the shape of the tube. As a result, I'm losing about 1 cm of depth because the ferrite rod is not in the tip of the probe.
What will happein if I just sharpen one end of the ferrite rod? This will make the tube and the rod to exactly fit each other, but will I lose even more depth because of the shape of the magnetic flux?

Thanks for your help!!


Here is a picture depicting the depth at the moment ( 5 euro cents)



And here is the probe with its old casing

[Funfinder]

Hello, I opened a new topic in the modification forum but you may be interrested, too:

http://www.geotech1.com/forums/showthread.php?t=17389

maximum detection distance: 20cm
pot - 20cm: 10cm
1 Euro - 24mm: 5cm
screw - 9cm long, 5mm thick: 3,5cm
small nail - 4cm long, 1,5mm thick: 3cm
little rusty metal piece - 8mm: 1cm

[kt315]

guys, there is something you have to look on!

http://www.findmall.com/read.php?22,1360527,1365500#msg-1365500

This is what the inside of a BH/Fischer pin-pointer looks like...and some air tests I did with it apart.
There is one pot lying flat on the board (DO NOT touch the other one), and it is to control SENSitivity...
you can mark the factory position of this with a fine tip perma-marker, then tweak it to try to get a few extra fractions of an inch...
You can desolder the LED and drill a hole in the case to mount it externally (the LED comes on with the buzzer sounding)
You can also go to Rat-Shack and get a louder (beefier) 6V buzzer (It looks the same as original, but is higher Decibel Rated)
A larger Buzzer or even LED will drain the battery quicker though (But it is worth it for the added audio and light for night hunting...
These are the only 2 mods I have done to this unit...OH!!! and you can add solder to the spots the coil is soldered to...glob it on...This seemed to add some distance, if only to give better conductivity to the coil???
Be mindful of the heat, as your dealing with small parts that can burn quickly...

[Gyur666]

Does anybody have something experience about it?

Nobody know Petra-Pin pinpointer? I'm going to build it. I think it is a simple way to make a two sensitivity, usable pinpointer.

[ik5pwr]

no lead battery , lithium 11,1 Cell

[Eddy71]

Interesting P.I. MD, but for pinpointer lead battery 12V 7A/h not very large?