modification ATX

[Mechanic]

Ooops, the preamp ic is missing from the last file.
Please see the updated pic..

Cheers Mick

[Mechanic]

Hi Guys,

Here is the atx front end I don't have values for the tx and rx coils that I can find.

Cheers Mick

[daverave]

i have wire like in the photo and mine is litz...cant believe garrett would use ordinary wire.

[Davor]

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

We had a thorough discussion on this coil here: http://www.geotech1.com/forums/showt...New-PI-machine
Aziz even made calculations with dimensions that balanced. The inner eye size is critical for balance. However, for PI a perfect balance is not a requirement.

[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...

[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.

[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.

[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]

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.

[greylourie]

WM6

[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 ????............................

[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.

[6666]

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

[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]

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 ?