Reverse engineering induction balance coil

[Jayt]

Dear all,
I am new to the forums i joined in the hope of finding likeminded individuals that love to tinker and modify devices.
My aim here is to produce a bigger coil tuned for deeper larger objects relics cashes and such, attached in the thread are three X-rays of the standard coil that comes with the velox one, this coil operates on 17.kHz frequency.
A bigger aftermarket coil exists for this detector produced by the same manufacturer but is discontinued and very expensive if found i aim to produce an even bigger one for more depth and bypassing smaller objects.
I anyone has worked on self made coils, is an electronics engineer, understands how to gauge coil values and most of all identify the components on this pcb without breaking the resin on the coil i would love to get your take on this endeavour

 

[Diga]

You might want to try this forum instead:

Forums - Geotech Forums

Geotech Forums

www.geotech1.com

 

[Jayt]

Thank you the refferal

 

[Rudy]

My take is that the bottom two terminals on the small circuit board are the connections to the transmit coil, the top two are for the receive coil and the small wire loops (sometimes called the gimmick coil) are for fine tuning the induction balance (getting better cancellation of the transmit field on the receive coil). The gimmick's shape and position are determined manually, using an oscilloscope, before the resin is poured.

 

[Jayt]

interesting what about those components on the pcb board what do you think they are and also can this be upscaled to a bigger coil or the whole thing has to be reworked

 

[Jayt]

My take is that the bottom two terminals on the small circuit board are the connections to the transmit coil, the top two are for the receive coil and the small wire loops (sometimes called the gimmick coil) are for fine tuning the induction balance (getting better cancellation of the transmit field on the receive coil). The gimmick's shape and position are determined manually, using an oscilloscope, before the resin is poured.

I also am going on wednesday to my employers lab i think they might have a suitable oscilloscope to test the coil

 

[Rudy]

interesting what about those components on the pcb board what do you think they are and also can this be upscaled to a bigger coil or the whole thing has to be reworked

Not enough detail in the photo for me to identify any components. All I see are traces and feedthroughs.

I also am going on wednesday to my employers lab i think they might have a suitable oscilloscope to test the coil

Good luck.Let us know what you find.

 

[cellrdwellr]

Interesting stuff here, looking forward to an update

 

[Jayt]

Interesting stuff here, looking forward to an update

Very interesting however i dont know if im up to the task im recruiting all the help i can get for this one

 

[Adam24]

Dear all,
I am new to the forums i joined in the hope of finding likeminded individuals that love to tinker and modify devices.
My aim here is to produce a bigger coil tuned for deeper larger objects relics cashes and such, attached in the thread are three X-rays of the standard coil that comes with the velox one, this coil operates on 17.kHz frequency.
A bigger aftermarket coil exists for this detector produced by the same manufacturer but is discontinued and very expensive if found i aim to produce an even bigger one for more depth and bypassing smaller objects.
I anyone has worked on self made coils, is an electronics engineer, understands how to gauge coil values and most of all identify the components on this pcb without breaking the resin on the coil i would love to get your take on this endeavour

Hello so how did you get this x-ray picture,is it a camera app?

 

[Jayt]

Hello so how did you get this x-ray picture,is it a camera app?

Well ofcourse not this was imaged at a medical center the machine costs alllllllot of money and i took the pics with my phone off the display