modification ATX

[tifred]

HI
This is my latest project.
i buy a ATX in poor condition; it was cut to alleviate and break the coil.
I buy a coil 5X10 infinium his works.
I go up the pcb abs in a box, I graphiter inside the box and ride on an old white cane's.
I am happy with the result, but I'm looking for an original coil atx but it is expensive in France.
For information, I speak very little English, I use google ... traduitor

The horror











the coil is hs ...




And this is ma restoration ...it is very light but not waterproof.

[Qiaozhi]

Nice job!

Why was it in such a bad condition? Is it ex-military use?

[tifred]

Thank Qiaozhi


No, not used by the military. The previous owner was cut to make a light detector.
But break everything .... and he walk the coil

[tifred]

Hello friends
Here is the coil that the previous owner broke
I will try to repair the coil but i need advice for winding.
have you schematic or advice?
the weight of the detector weighs



very light atx

[6666]

Hello Tifred what did you do with the windings of the coil ? do you still have the wire ? can you remove the wire from the potting mix so we can learn how garrett made the coil ?
do you have any more pictures of the coil ?

[tifred]

HI 6666
Yes I have the number of turns and type of wire, but there is resistance and I have no value, it is breaking.
I have pictures but I do not know if I'm allowed to show, there surely has a garrett patent.

[6666]

Thanks for the picture it confirms some theory's about the coil construction .

[Davor]

It was only obvious. I'm a bit surprised to see plain magnet wire, and no trace of tidiness. With proper initial geometry it must be very easy to balance.

[DOOLEY]

hum,
so basically inside it's arranged like this then ????



now who posted this picture ages ago with the suggestion a coil could be
balanced using this configuration ????............................

[greylourie]

WM6

[6666]

hum,
so basically inside it's arranged like this then ????

[ATTACH]34676[/ATTACH]

now who posted this picture ages ago with the suggestion a coil could be
balanced using this configuration ????............................

I made some coils in that configuration and when they were balanced there was a lot of difference in over lap distances from original atx coil,
it only required a small amount of overlap to balance,

Bending the coils more to the atx shape I could not balance them with placing coils over each other like the atx design, I had to move them father apart to balance, without having an atx coil to test, my conclusion (right or wrong)
was the atx coil is not IB.

[Qiaozhi]

PI detectors with separate TX and RX coils do not need the coils to be induction balanced. There are two possibilities here that I can think of:
1) The sensitive area is within the centre circle, whereas a standard DD configuration would have a thin sensitive area from front-to-back.
2) It was designed to make the casual observer conclude that the coil is actually a concentric.

[6666]

1) The sensitive area is within the centre circle

After watching a video , you may be right, the video showed detecting a small gold clasp that other coils could not detect.

[Koala]

After watching a video , you may be right, the video showed detecting a small gold clasp that other coils could not detect.

I was also watching YouTube. Quite respectably distance on a .1 gram gold nugget. Pinpoints really well.

[Geo]

PI detectors with separate TX and RX coils do not need the coils to be induction balanced. There are two possibilities here that I can think of:
1) The sensitive area is within the centre circle, whereas a standard DD configuration would have a thin sensitive area from front-to-back.
2) It was designed to make the casual observer conclude that the coil is actually a concentric.

I believe the second...