Moodz' Awesome Gold Pulse Induction Version 3 - MAGPI V3 Project

[van0014]

I’m looking forward to making this, and have a big bag of components. More parts to come, and BSP230 is hard to get.

i’m using an illuminated rotary encoder as a power on light. Also hopefully a 2004 LCD with a white backlight. Maybe even a potentiometer for audio and gain or SAT control

[geoscash1]

Very beautiful. Can you picture it front and back? Excuse me

Sure, front and back...

[Technologyh]

Very beautiful. Can you picture it front and back? Excuse me

[Technologyh]

Got my boards today, turned out nice. Need a few more parts and finish up another project then will get started on this.

[geoscash1]

Got my boards today, turned out nice. Need a few more parts and finish up another project then will get started on this.

[van0014]

I've been exited to make this for a few weeks now. And am taking time to select components. In a spreadsheet I have components, their numbers and their function. I'm hoping to place an order soon

There is only one component I had trouble finding, the BSP230. I want to try SIHFR9310TRL-GE3. I'm not sure if it's suitable and if circuit changes are needed. I noticed some differences (aside from DPAK TO-252AA).

It has higher input capacitance (BSP230: 90pf. SIH: 270 pF).
Drain to source voltage is higher (BSP: 200v. SIH: 300v)
Gate charge (BSP: ~1nC. SIH: 13nC @ 10V.)

In total, parts will be about $185 AUD. I've opted for resistors and capacitors with lower temperature drift. I'm looking forward to trying this out and getting into the field again. After trying detecting for about a year, with GM1000 and the Spectra V3, i'd given up and gradually sold them.

Now with this brilliant machine, leveraging the skills of Moodz' engineering and innovation, I will be more enthusiastic than last time. Knowing that it's no longer the detector that's holding me back. It's my mind, my patience, my inner voice..

Last time it was saying: 'don't dig, it's trash!'. 'Give up!'. 'You could be doing something useful'. 'It's all been found!'.

This time it'll be saying:
'GM1000 has limited settings. This machine has a few settings. I like settings.'.
'There's more to be found. Now you can see'.
'You've got a good detector. Can't blame the machine anymore!'.
'I wonder what's happening in the PCB. Electricity. Capacitor. Resistor. Diode. Pulse. 50Hz, no, stay away from my coil. It's everywhere!'
'Dig it and learn what different targets sound like'

Edit:
I can buy a BSP230 for $40 but am hoping for an alternative with similar performance. BSP225 may be the closest I can get. Hopefully the 50v drop in Vds doesn't affect the circui much

[moodz]

It takes a long time to properly test new things in this technology. There are lots of projects which are YAPID ( Yet Another Pulse Induction Detector )...based on established ideas. MAGPI 3 is not a YAPID detector but also is not my day job ... I do work on it when I can but I currently have 4 other projects in hand. Presently I am working on testing MAGPI 4. MAGPI 4 is much improved over version 3 ... For instance it offers full depth discrimination and full auto continuous ground balance. I have spent 6 months converting the 3 model to an ideal mathematical detector in software only. There are no analog processing elements in the detector
..eg amplifiers etc

Unfortunately it is not a built with 555 and 4066 circuits ... My next challenge is to extract precision from simple but elegant strategies that will not require expensive / hard to get components ... Eg high speed precision ADC.

Moodz

[AhmatAhmatov1959]

Any new info/updates for this project? Is the v3 still the current one being used or?

Is the 1.4 software/source code still the last version with LCD and audio update?

Took a while to find the right thread for this, so many cross ref links all over the forum so sent a pm but found it, I think.

Would like to try this out since Im in Nor Cal and have some pretty hot ground and loads of hot rocks here.

Hello, I ask those who made this project to respond. Are there any mods? Thank you.

[Technologyh]

I think that. We are waiting and we want to participate

[geoscash1]

Any new info/updates for this project? Is the v3 still the current one being used or?

Is the 1.4 software/source code still the last version with LCD and audio update?

Took a while to find the right thread for this, so many cross ref links all over the forum so sent a pm but found it, I think.

Would like to try this out since Im in Nor Cal and have some pretty hot ground and loads of hot rocks here.

[moodz]

Thanks for answering. I don't have enough brains to change the timings.

well I have an idea in the works .... it will improve things and you will be able to reuse the MAGPI circuit.
Might take a little while .... ( couple of months maybe or sooner if things work out ).

[AhmatAhmatov1959]

Hi ... The MAGPI is a monocoil detector. Unfortunately you cannot connect a DD coil to the detector without modifying the code and a few hardware changes.
I am not saying its impossible but you would need to separate the RX circuit from the TX circuit and modify the timings.

Thanks for answering. I don't have enough brains to change the timings.

[moodz]

Hello. Please answer. Is it possible to connect a DD coil to this metal detector? If so, how. Thank you

Hi ... The MAGPI is a monocoil detector. Unfortunately you cannot connect a DD coil to the detector without modifying the code and a few hardware changes.
I am not saying its impossible but you would need to separate the RX circuit from the TX circuit and modify the timings.

[AhmatAhmatov1959]

Hi Moodz, what is the latest version for LCD display ? If there is, any chance of a copy please ? I'm currently using 1.5 with non working volume.
Thanks

Hello. Please answer. Is it possible to connect a DD coil to this metal detector? If so, how. Thank you

[AhmatAhmatov1959]

If the coil is picking up your hand then most likely there is no faraday shielding on the coil.

You can use graphite paint ( make your own out of a few drops of varnish mixed with acetone and large spoonful of graphite powder in a glass jar.)
Lay down a very very thin copper wire connected to ground of the coil cable along the coil circumferance ( however do not connect the ends of the copper wire to form a loop !! )
Paint the graphite mixture onto the coil in a thin continous coat ... but leave a gap ( eg 5 mm ) so no loop is formed.

test and reapply graphite if necessary.

Hello. Is it possible to connect a DD coil? There were no modifications for two years of the project? Thanks for the answer. Sorry for the English