How to approach making a coil for Infinium

[adrian ss]

So far the few people I have heard of who have attempted to build and fit their own coil to the Infinium has resulted in a blown control box cct

[gedfire]

Infinium Coil

Again, the blown box may have been the result of incorrect calculations.The laws of electricity follow certain rules.They should have worked out the amps and connections to the infinium.In fact now the infinium is blown,it would be a good opportunity to take it apart,work out its basic schematics.Maybe do the same with the coil, then do a little reverse enginneering.I guess the researcher would want to have a multimeter with them and good experience with electronics.The bottom line is these devices are man made and I certainly think a good electronics enginneer (with maybe a lot of time) could figure it out.Their is hope however, still, I am saving to get the TDI.

[echo]

Anyone have a non-working mono coil?

Hi All,

Does anyone have a non-working mono coil that they'd be prepared to disassemble or sell for research?

I'm still keen on building a large mono coil but I need to work out the configuration of an existing coil so as not to damage the Infinium with experimental coils.

I've seen on posts that people claim to have a copy of the circuit but no-one has been able to post or email one yet. If you do have one, I'd be grateful for a copy.

Thanks.

[gedfire]

Mono Coils

I will try to see if can get one or locate any schematics.I think I will work on building one myself.Will keep everyone informed.

[Pinpoint]

Apparently, you need to be EXTREMELY precise and the slightest miss-calculation will damage your Infinium beyond repair.????

[Rov]

wrong! apparently there was? or still?Westcoil in western australia in collaberation with Australian goldminingcentre for Garretts,for infinium making PI coils for the infinium in larger sizes.or configurations?
This may still be ongoing or else closed due to lack of interest or some bueracratic concern??google this up?google is still u friend?
cheers! Rov.

[Pinpoint]

wrong! apparently there was? or still?Westcoil in western australia in collaberation with Australian goldminingcentre for Garretts,for infinium making PI coils for the infinium in larger sizes.or configurations?
This may still be ongoing or else closed due to lack of interest or some bueracratic concern??google this up?google is still u friend?
cheers! Rov.

They've stopped making coils due to lack of interest and $. They made three types of coils that were the same shape and same size, a 10" oblong shape. Two were mono's and one was a DD. Just what the Infinium needed to add to their variety

Apparently, the maker of these coils won't disclose on how to make them nor will he make any coils.

http://www.goldminingcentre.com.au/G...infinium.shtml

[echo]

Infinium Mono Coils

Hi All,

I've heard that you can damage the Infinium front end by trying to connect a Minelab coil and this is probably why the rumours surfaced; because people had tried that and I have no reason to doubt that it's true.

Trouble is - a little knowledge can be dangerous and you can't just blindly connect a coil to a different detector and hope that,

1. The pinouts will be the same,
2. The impedance will be appropriate
3. That the inductance will be identical
4. That there isn't a DC path back from the induction coil into the RX circuit
5. That the mutual coupling won't be excessive,
6. The secondary back emf won't exceed the breakdown voltage of the RX front end
7. That there isn't a dampening or snub component required
etc.
etc.,

I'm quite happy to test my electronics skills and use my detector as a guinea pig but I need some basic information first so that I can understand what I'm dealing with.

I'm sure that some headway can be made if we can examine a faulty coil to determine what electrical parameters we need to adhere to and then we can work out what margin for error we have to play with.

Personally, I've never blown up anything through poor design, but I certainly have through rushing.

[Tim Williams]

I would like to build one of these also. I bet am 18" would hit some deep cannon balls with the Arc-Geo! Count me in.

Tim

[Rov]

a few spec from an Infinium 10x5 Eliptical Power DD coil.
5 core cable
White to Brown of coil half one
Green to Brown of coil half one
Red to Black of coil half two
Black to Black of coil halve two
Screen wire connected to the two halves of coil shell (two halves of coil shell are Electrodag coated/painted)
the Brown coil is 26T light duty tin plated multistrand hook up style wire pvc coated
the resistance of this coil 0.9ohms
the black coil is 40T light single strand Kynar wire.
the resistance of this coil is 7.4 ohms (with no resistor across)
internally across this black coil wired in parallel is a 1/4w resistor 680
color code,blue,gray,brown,gold.
At this time i do not have the inductance values for these individual coils,but these few spec gives you the essential towards this DD infinium coil
Note the coils are wound bundle style an heavy hot melt glue bonded to a foam eliptical dd shape former.in an original.this foam former is not electrodag coated only the two coil shells.
there is no epoxy in these coil shells ,only great quantity of hot melt glue bonding.
hope this helps those that may have an interest towards built their own?
as time allows will try to post some photos of the actual coil shells an windings exposed.an you will see no high science here?for the Infinium coils.
regards Rov

[Rov]

quick pics of the coil shells open
Rov

[Tim Williams]

I have a friend that sells 18 coils for the whites TDI coil. I will have a page for him soon on my site. From what I hear they work very well.

[Rov]

Hi Tim,these 18inchers,they DF or is it a mono?
Can do a Mono at 18 with screening without too much effort for a Infinium,but a DF will take a bit more build time.maybe adapt the winds spec from DD towards a DF.is achievable for the infinium.is Ok.still essentially a mono for the circuit to see an drive. overall.
An No you dont blow the front end!Dont perpetuate the Myth.
An inherent weak front end,drive circuit will fail in time on its own.U keep all your initial wind an build spec. parameter right,no problems.the infinium front end is more resiliant than you think.
Rov

[Tim Williams]

I'm interested in a 18" mono. If you have info please email me.
Tim

[Rov]

email sent!