northwest moodz detector new front-end getting ready for testing
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Aziz
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« Reply #60 on: Saturday August 30 2014 06:02:42 AEST AM »

Nice work!
I want to have 500 pieces for the European market.
Maybe I get then the "love letter" from Greedlab!
excited
^sif
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« Reply #61 on: Sunday September 7 2014 00:06:49 AEST AM »

...good news .. I think .. located a mistake on the pcb where an amplifier was referenced against digital ground instead of analogue ground. A gain  limitation caused by digital ground referenced noise ... the amplifier was effectively amplifying ripple on the digital supply ... has now been fixed.

Beer can test in air  = 6 feet  with 18 inch coil .... very easy ... 7 feet is detectable.

This can get better as I have an order of gain x 10 headroom and the TX current is restricted for testing.

50 cent piece detection range in air = 1 meter. .... I could not see this on other detectors at 1 meter.

...better news ... this is a work in progress .. however  discrimination tests show  ferrous / non ferrous  discrim with 25% reduction in depth .. aiming for full depth ... probably achievable.

I think I may have the only true mono coil discriminating Pi detector in captivity on the planet.  excited

time will tell .. it aint over till its over and gold is where you find it.


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« Reply #62 on: Sunday September 7 2014 00:21:56 AEST AM »

  
  
  
...the signal chain from end to end is operational ...rewritten the audio section to produce  a fully digital arbitrary waveform generator with digital volume and frequency control

The pic shows TX  pulses  at coil end and audio waveform at the user end  .... verrry nice even if I say so myself.





So is the detector now complete?


doug smile

The board is - see board on testbench below ... This is close to the final version. Minor track tweaks to improve track  spacing here and there .. I may do away with the plug .... you can see in the pic that the wire from the coil goes straight to the plug  .. there are no solder points in the coil. Coil shielding is not required ... this detector has a broadband match front end and does not pick up EMI or hand capacitance.  ( willing to be convinced that this is not the case but only testing will tell )   More code tweaks to improve audio and user control interface. Lots of field testing. ( aiming for october when the guys are available. )
The current draw is  320 ma at 16.6 volts and 450 ma at 12 volts ( LIPO pack discharged ). Thats good for 10 hours  of detecting on the pack I am using. The unit will shutdown when the battery voltage reaches over discharge for LIPO.  batteries cos $90 not $250 and  there is enough spare pins on the CPU to build an integrated LIPO fast charger .. but that will be version 2.

Well ... I convinced myself .. the tweak to the amplifier ground reference opened up an increased gain range and the coil is susceptible to hand / ground coupling capacitance. It was with great sadness I  added shielding to the moodz coil which adds another 10 minutes to the 40 minute assembly time for a coil ... doh. But it works like a charm. excited
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deemon
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« Reply #63 on: Sunday September 7 2014 01:16:42 AEST AM »

  
I think I may have the only true mono coil discriminating Pi detector in captivity on the planet.  excited


Except of my one ...  happy face
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WM6
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« Reply #64 on: Sunday September 7 2014 02:32:51 AEST AM »

  

Beer can test in air  = 6 feet  with 18 inch coil .... very easy ... 7 feet is detectable.

50 cent piece detection range in air = 1 meter. .... I could not see this on other detectors at 1 meter.

I think I may have the only true mono coil discriminating Pi detector in captivity on the planet.  excited

time will tell .. it aint over till its over and gold is where you find it.



Great results even in air. Congratulations moodz. For discrimination capabilities especially.

18" coil could be pretty heavy for all day swinging.

Curious about 10-11"coil results.
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« Reply #65 on: Sunday September 7 2014 10:18:49 AEST AM »

Great work! any chance of posting a clip on youtube?
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Aziz
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« Reply #66 on: Sunday September 7 2014 20:21:58 AEST PM »

Nice, very nice. I take 1000 pieces for the European market!
excited
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« Reply #67 on: Sunday September 7 2014 22:28:44 AEST PM »

  
...good news .. I think .. located a mistake on the pcb where an amplifier was referenced against digital ground instead of analogue ground. A gain  limitation caused by digital ground referenced noise ... the amplifier was effectively amplifying ripple on the digital supply ... has now been fixed.

Beer can test in air  = 6 feet  with 18 inch coil .... very easy ... 7 feet is detectable.

This can get better as I have an order of gain x 10 headroom and the TX current is restricted for testing.

50 cent piece detection range in air = 1 meter. .... I could not see this on other detectors at 1 meter.

...better news ... this is a work in progress .. however  discrimination tests show  ferrous / non ferrous  discrim with 25% reduction in depth .. aiming for full depth ... probably achievable.

I think I may have the only true mono coil discriminating Pi detector in captivity on the planet.  excited

time will tell .. it aint over till its over and gold is where you find it.


Moodz detector new front-end getting ready for testing Depth Testing-further updates.  Using Normal Enhance and Fine Gold Timings/4500/5000 on large gold nuggets? “ (Doug’s predictive quote) Well looks like its not far away now …. just as time is running out at the patent examiners office !  smile

With air testing looking good, and some small glitches overcome Moodz, it will indeed be time for some comparative depth testing against some 'market favourites' on some deep, larger larger nuggets in hot ground. A Simple, effective, ergonomic metal detector AND with discrimination??? Wow!  Its enough to get the mind lab rats dancing in a frenzy with agitated curiosity and envy. Again an original (backyard) technology ALL without a R&D lab of engineers and millions spent on IP … just like the QED. ". It ain't over till its over " is quite right!

Well done!!  good luck

Huego  happy face
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BILLY
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« Reply #68 on: Monday September 8 2014 04:35:31 AEST AM »

  


Moodz detector new front-end getting ready for testing Depth Testing-further updates.  Using Normal Enhance and Fine Gold Timings/4500/5000 on large gold nuggets? “ (Doug’s predictive quote) Well looks like its not far away now …. just as time is running out at the patent examiners office !  smile

With air testing looking good, and some small glitches overcome Moodz, it will indeed be time for some comparative depth testing against some 'market favourites' on some deep, larger larger nuggets in hot ground. A Simple, effective, ergonomic metal detector AND with discrimination??? Wow!  Its enough to get the mind lab rats dancing in a frenzy with agitated curiosity and envy. Again an original (backyard) technology ALL without a R&D lab of engineers and millions spent on IP … just like the QED. ". It ain't over till its over " is quite right!

Well done!!  good luck

Huego  happy face

  I agree that it will be right up there with the QED.  Maybe better than the QED.  Can hardly wait for the release of it on the market.  I hope it does as good as the QED did.
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« Reply #69 on: Monday September 8 2014 08:13:51 AEST AM »

  
  


Moodz detector new front-end getting ready for testing Depth Testing-further updates.  Using Normal Enhance and Fine Gold Timings/4500/5000 on large gold nuggets? “ (Doug’s predictive quote) Well looks like its not far away now …. just as time is running out at the patent examiners office !  smile

With air testing looking good, and some small glitches overcome Moodz, it will indeed be time for some comparative depth testing against some 'market favourites' on some deep, larger larger nuggets in hot ground. A Simple, effective, ergonomic metal detector AND with discrimination??? Wow!  Its enough to get the mind lab rats dancing in a frenzy with agitated curiosity and envy. Again an original (backyard) technology ALL without a R&D lab of engineers and millions spent on IP … just like the QED. ". It ain't over till its over " is quite right!

Well done!!  good luck

Huego  happy face

  I agree that it will be right up there with the QED.  Maybe better than the QED.  Can hardly wait for the release of it on the market.  I hope it does as good as the QED did.

Very droll Billy ..I will be field testing in October. There are still things to do...like lay out the new PCB with the corrections added ..I have not synchronized the main power supply ..it does not seem to be a problem. Anyway forwards and upwards.
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BILLY
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« Reply #70 on: Monday September 8 2014 09:50:43 AEST AM »

  
  
  


Moodz detector new front-end getting ready for testing Depth Testing-further updates.  Using Normal Enhance and Fine Gold Timings/4500/5000 on large gold nuggets? “ (Doug’s predictive quote) Well looks like its not far away now …. just as time is running out at the patent examiners office !  smile

With air testing looking good, and some small glitches overcome Moodz, it will indeed be time for some comparative depth testing against some 'market favourites' on some deep, larger larger nuggets in hot ground. A Simple, effective, ergonomic metal detector AND with discrimination??? Wow!  Its enough to get the mind lab rats dancing in a frenzy with agitated curiosity and envy. Again an original (backyard) technology ALL without a R&D lab of engineers and millions spent on IP … just like the QED. ". It ain't over till its over " is quite right!

Well done!!  good luck

Huego  happy face

  I agree that it will be right up there with the QED.  Maybe better than the QED.  Can hardly wait for the release of it on the market.  I hope it does as good as the QED did.

Very droll Billy ..I will be field testing in October. There are still things to do...like lay out the new PCB with the corrections added ..I have not synchronized the main power supply ..it does not seem to be a problem. Anyway forwards and upwards.

  No droll humor intended Moodz.  Just agreeing with Huego words.  Take it easy.
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moodz
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« Reply #71 on: Monday September 8 2014 14:10:50 AEST PM »

  
  
  
  


Moodz detector new front-end getting ready for testing Depth Testing-further updates.  Using Normal Enhance and Fine Gold Timings/4500/5000 on large gold nuggets? “ (Doug’s predictive quote) Well looks like its not far away now …. just as time is running out at the patent examiners office !  smile

With air testing looking good, and some small glitches overcome Moodz, it will indeed be time for some comparative depth testing against some 'market favourites' on some deep, larger larger nuggets in hot ground. A Simple, effective, ergonomic metal detector AND with discrimination??? Wow!  Its enough to get the mind lab rats dancing in a frenzy with agitated curiosity and envy. Again an original (backyard) technology ALL without a R&D lab of engineers and millions spent on IP … just like the QED. ". It ain't over till its over " is quite right!

Well done!!  good luck

Huego  happy face

  I agree that it will be right up there with the QED.  Maybe better than the QED.  Can hardly wait for the release of it on the market.  I hope it does as good as the QED did.

Very droll Billy ..I will be field testing in October. There are still things to do...like lay out the new PCB with the corrections added ..I have not synchronized the main power supply ..it does not seem to be a problem. Anyway forwards and upwards.

  No droll humor intended Moodz.  Just agreeing with Huego words.  Take it easy.

Ha Ha ...no I was not upset ...I thought you were being sarcastic  with the "success"  of the QED ...like getting myself sued etc.
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« Reply #72 on: Monday September 8 2014 15:34:46 AEST PM »

Sounds good to me Moodz ..... especially with field / ground testing starting in October .. Yes, 2014 for the doubters!   smile

As I said, comparative depth testing against some 'market favourites' on some deep, larger nuggets in hot ground is what is required to convince those who doubt its competitiveness.

Better Depth performance is where future small fortunes lie for prospectors and treasure hunters, at depths beyond the reach of the older modelsexcited

Again my praise is NOT initially for reaching the marketplace but for what appears to be design originality and performance as you have shown in air tests AND all based on (backyard) technology without requiring ML help or major R&D expenditure on IP … ie just like the QED was a technical success, based on tests I saw done with it.

 happy face
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« Reply #73 on: Monday September 8 2014 15:58:09 AEST PM »

  
Sounds good to me Moodz ..... especially with field / ground testing starting in October .. Yes, 2014 for the doubters!   smile

As I said, comparative depth testing against some 'market favourites' on some deep, larger nuggets in hot ground is what is required to convince those who doubt its competitiveness.

Better Depth performance is where future small fortunes lie for prospectors and treasure hunters, at depths beyond the reach of the older models.  excited

Again my praise is NOT initially for reaching the marketplace but for what appears to be design originality and performance as you have shown in air tests AND all based on (backyard) technology without requiring ML help or major R&D expenditure on IP … ie just like the QED was a technical success, based on tests I saw done with it.

 happy face

The QED is certainly a benchmark to aim for. Once you get the level of performance right ..its just a matter of lining up the ducks.

... and one of the ducks is that the detector being very sensitive is easly overloaded by metallic targets coming close to the coil ... this causes the detector to desensitise for a second or so and this means the pinpointing on closer range metallic targets is rubbery. I have a cunning plan to remedy this using software and if that does not work I will hit it with a log amp.
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« Reply #74 on: Sunday October 12 2014 22:19:06 AEDT PM »

...had to come back from the field when a dry solder joint played up on a cap. ( started picking up earth field and lost target sensitivity  scared ) ... however found the problem  ..  resoldered and all good to go ....

Using the 18 inch "basket coil with drain wire" coil ... EMI rejection was good even under HT power. Electric fence was good. Over hot ground GB  must be working ... can't change it because its built into the design.  Earth field rejection ..what earth field ?  Brought some hot rocks along ... could not detect them on hot or easy ground.

Some areas picked up lots and lots of aluminium foil  ( small aged scraps ). Quite a few old iron tools, nuts, bolts etc.

Tried out in marshy ground ... all good ... more foil scraps. Theres a lot of foil out here  scared

Detector weighs 1.7 Kg with shaft coil box etc.

6 hours of tecting and the battery was still more than half full.

Well that was easy ... I'm bored now ... time to find some other code to crack.   

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« Reply #75 on: Sunday October 12 2014 23:05:52 AEDT PM »

  
...had to come back from the field when a dry solder joint played up on a cap. ( started picking up earth field and lost target sensitivity  scared ) ... however found the problem  ..  resoldered and all good to go ....

Using the 18 inch "basket coil with drain wire" coil ... EMI rejection was good even under HT power. Electric fence was good. Over hot ground GB  must be working ... can't change it because its built into the design.  Earth field rejection ..what earth field ?  Brought some hot rocks along ... could not detect them on hot or easy ground.

Some areas picked up lots and lots of aluminium foil  ( small aged scraps ). Quite a few old iron tools, nuts, bolts etc.

Tried out in marshy ground ... all good ... more foil scraps. Theres a lot of foil out here  scared

Detector weighs 1.7 Kg with shaft coil box etc.

6 hours of tecting and the battery was still more than half full.

Well that was easy ... I'm bored now ... time to find some other code to crack.   



Thanks! But according to the patent parrot (Robby_H) your detector can't possibly work!
doug smile
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« Reply #76 on: Monday October 13 2014 04:46:46 AEDT AM »

  Looks good Moodz.  Is that one of the coils you talked about that you were going to produce?  How about a video of it working?
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« Reply #77 on: Monday October 13 2014 05:17:07 AEDT AM »

Nice :)
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« Reply #78 on: Monday October 13 2014 09:03:42 AEDT AM »

 Moodz any pictures of the front panel?
doug smile
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« Reply #79 on: Monday October 13 2014 11:18:57 AEDT AM »

Well done Moodz! We look forward to any news of it, especially how well it performs in field tests.  good luck

Big coil, but otherwise It looks lightweight & amazingly compact ... as "compact as a crumpet" if you'll excuse the expression (that's a dig at the dinigrators who refuse to accept its very existence).

 happy face
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