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Topics - woody

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1
The mosfet that is used a voltage limiter in GPX detectors can now be upgraded to a 250 volt 9 amp mosfet, I tested the newer p channel mosfet and the detector is a little more stable and should never have this part fail again.

2
We managed to obtain better batteries and a new high capacity one that sticks to the side of the detector. Look on the products page.

3
Mods and Price list / Two very different prospecting techniques.
« on: May 03, 2018, 03:24:50 am »
My goal has been to keep my detector quiet as a mouse when I go detecting so that I can hear the most tiny ground change that may be a deep target. Most prospectors detect this way but I came across a fellow that had his detector cranked up so high I thought that there is no way that he can find gold, then I had an education.
He was using a modded GPX5000 with the front gain nearly full and the back gain on 20.  I thought no way, this guy has lost his marbles but then he showed me a 16 oz nugget he got the day before, then he showed me the pictures on his phone and I was amazed.

5
We have some Enhancement Fets coming out way in a couple of days, lots of testing on the sample devices. These will obtain near zero loss on the signal input side, extremely low capacitance of 28pf ci  22 co 3 tc  R on of less than 100 milli ohm at 5 amps. These fees are in die form, custom made for us. expensive little buggers.  The original standard fets do generate electron mobility noise in the  D-S conduction channel in most fets, also the channel can be modulated with fluctuation of the gate driver. This causes wide bandwidth noise and can obscure small signals.  We are working hard to overcome these issues. More Gold to you.

6
Information on the new developments / GPZ7000 upgrades...yes yes yes
« on: September 19, 2017, 05:13:27 pm »
We can now upgrade the GPZ-7000 , greater depth, better small gold performance and more stabile and quiet.

(Pity we cannot make it lighter)

Currently carrying out tests on a variety of ground.

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General Discussion / If you cannot join the forum..
« on: April 17, 2017, 12:50:05 pm »
We had some issues with the anti spam system , we are told it has been fixed.. So try joining up.

8
There seems to be a lot of new components being made available that can be used to replace components in old detectors to massively improve the performance, we have been in the lab trying out these new parts and some of the results are mind blowing to say the least.... more to come.

One of the most annoying problems using a P.I detector is that they seem to suffer from a lot of interference, well some new devices have been made available that have anti emissions filters built in, I have tried some of these components and noticed an increase in target response at the same time having a quieter more stabile detector. 

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Mods and Price list / Price list and mod info
« on: February 28, 2017, 10:34:19 am »
Price list for upgrades.

The upgrades start at $250 and go up to $2200, all upgrades carry a 5 year warranty.
If there is any problem with your Minelab in the  future we can repair it, we work on Minelab detectors all day long.  Experience is 30 years electronic engineering, 18 years repairing and upgrading Minelab detectors.

We can upgrade the following detectors,

SD2000, SD2100, SD2200 GP Extreme, GP3000, GP3500, GPX4000, GPX4500, GPX4800, GPX5000.

We have done some work on the SDC2300 and the GPZ7000 but have found the design platform is too difficult and too time consuming to work with, when we upgrade the GP and GPX series detectors we have found superior depth and small gold performance than the SDC and GPZ.
As an example, an upgraded and fully modified GPX4500 will detect deeper than the GPZ7000 and will also detect smaller gold deeper than a SDC2300.

 We have carried out testing and found that we can beat these newer detectors in most types of ground. The SDC will detect the most tiny gold, I refer to this as time wasting Gold, spending 10 minutes looking for a fly speck of gold is not prospecting, you are far better off getting half gram or larger bits. Trying to sift out fly specks robs you of productive swinging time and will reduce your chances of shining the coil over a larger piece of gold.

All detectors can have increased performance by replacing the input Field Effect transistors with lower loss types that have recently become available.

The SD2100 to the GPX5000 can have variable frequency added, this makes a very big difference in regards to the size of the gold, the depth and type of coil that you are using.

All detectors can have a variable gain board added that greatly increases the sensitivity and also allows for correct ground mineral reduction so that gold targets can be distinguished in noise ground or in noisy electrical environments. The minelab gain on the GPX does not work the same way as our gain, matching the input stage to the ground is critical to hearing the targets that standard detectors miss.

The upgrades that we carry out allow for optimisation of coil size, ground type and depth.

Our modifications and upgrades allow the operator to be able to control the detector to best suit the multitude of variables so that more gold is won in the field.

The full upgrades on a SD detector $1500 , on a GP is $1800 and GPX is $2200 and all come with a 5 year warranty that is fully transferable. Newest upgrades (mods) include the deep gold low frequency mode that makes a huge difference to being able to find big deep gold in the most noisy ground.

We can just do smaller upgrades starting at $650 but we find that most prospectors want the best and go for the full upgrades.

When these upgrades are carried out it is like using a newer more modern detector, in just about every case our customers have gone over old ground and pulled out more gold after the upgrades.
Yes, I have also pulled out more gold from area’s that have been detected over by lesser technology.

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How to repair faulty detectors / Can you trust your detector coil?
« on: February 22, 2017, 07:37:46 pm »
Found a couple of issues with coils, might pay to check them out.

https://www.youtube.com/watch?v=WfUxkfj1b7Y

11
Well guy's, I've been busy soldering components as big as ants and testing a lot of different electronic system to get more smaller gold and also larger gold at depth.  Many of the standard detectors have great difficulty finding simulated 3 oz nuggets at 22 inches, even with a large coil.  I am sure that when we see a lot of big holes and people say they got a 5 gram at 20 inches it is not possible, my hunch is that the nugget was always in the wall higher up and falls in when the  hole is widened out.  Anyway I digress, I have come up with a way to get an honest 30% depth increase on large gold, you know the coke can sized nuggets that everyone just walks over. I think it will marry up perfectly with the new 24 inch evolution coil that is coming out.  Anyway, if you want to hunt for the next hand of faith at greater depth let me know.

14
Over the years I have had a some very good prospectors doing a fair bit of testing and providing excellent feedback on how to make things better, Big thanks to Bobby White up in Charters Towers, Peter from Melbourne and Matt from Ballarat. Just yesterday Matt came to me with suggestions on gain control and noise, after some discussion i had a brain wave that just had to be tried, I opened up Matt's detector and did a few circuit changes and after initial bench testing we went to the local gold area at Sparrow ground to do some testing. I have never seen Matt with such a big smile on his face, testing the GPX4500 on a 0.2 we could detect it at 8" with "no noise" the most interesting thing was at nearly full gain we were not getting much interference and the ground noise was minimal even using normal timings. It is a fine line designing an input stage that will handle the dynamic range of ground responses and still get maximum performance.  This time I think we nailed it, some more testing will be carried out across the red hot ground of the golden triangle in the next few days.  PS coils used were NF 17" elliptical and 17" Elite flat wound.  The new mods tamed that Elite coil perfectly.

15
General Discussion / Inside the GPX-4500 andGPX-5000
« on: December 20, 2016, 09:18:39 pm »
Has anyone ever wondered just how they work?  These detectors have 2 main hearts, a CLPD, a complex logic device that is located right next to the Hitachi processor ic, these 2 devices control the timing for various tx and rx functions and general housekeeping as like controlling the electronics when switches are changed. The input stake is much the same as the GP series except they are using a reverse biased n channel mosfet as the second device in the tx on voltage and back emf blocking, a dual gate mosfet is used to hold the input ad797 inputs to ground when not in receive mode. The only difference is that in previous detectors the mosfets were connected to ground but now there are 1k resistors in series to ground. Next in line are the usual bank of 4053 switches and as a slight departure from old designs 10 sets of dual opamps. power supply and feedback is much the same as the old GP design.

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