Make It Yourself Metal Detector : : XPIThe unit is comprised of 3 boards. The Mainboard, witch contains the DSP and a 1 bit PWM DAC for audio as well as headers for a HD4. LCD, User Interface Switches, and the two daughter boards, one for the Analog Fronted (RX) and one for the Mosfets controlling the TX function. The Analog Fronted board contains the 1. MSPS Low noise ADC and is connected to the CPU with a high speed SPI link, This board contains 2 high speed op amps providing a gain between the two of them of 5. The TX Mosfet driver board contains an Isolated 2ch Mosfet driver as well as the two mosfets to drive a double O coil.

I chose the Daughter board configuration to allow for easier upgrades in the future and make debugging easier. The secret to it's deep penetration is low noise, Everything is designed from the ground up to minimize all types of noise. To do this XPI utilizes the following techniques. Moving Midway Full Movie In English.

Averaging: XPI takes 6 samples (first 5 detection and the sixth is a ground balance sample) during the fly- back decay and averages them each against the last 6. To do this we have to process 6. This level of performance is only made possible by the high powered XS1- L1 DSP. By averaging in real- time over each individual sample set an extremely high degree of noise removal is possible. Insanely Powerful EM Field: Because of this, XPI will probably never pass electronic remittance requirements which govern this type of equipment and will therefore remain as an experimental kit only, but since I'm in this for more than money the advantages of a much stronger field are huge. A stronger field punches deeper into all types of soil while overpowering background noise that may be present in the area. Combining these technology allow normally weak targets to sound out strong!

Enabling the best detecting of small, deep targets as well as everything in between! Please leave a comment below and join our mailing list to receive the latest updates! Comments. Posted by. Everett. Nov 2. 1st, 2. Wow,The XPI seems like a great detector, sounds like you have it already planned out with PCBs. When will we see a kit/PCB's? Have you built a prototype yet?

1,011 Responses to Who’s on First? Who’s a Ghost? “Time of Their Lives” Tonight! XPI The unit is comprised of 3 boards. The Mainboard, witch contains the DSP and a 1 bit PWM DAC for audio as well as headers for a HD44780 LCD, User Interface. It seems that more and more of our visitors would like to post their lyrics here, so we have created this page.

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What target price are you shooting for? Posted by. Nov 2.

The current ADC fronted board had some problems with the gain stage, Input impedance was too low, So I'll be getting some new ones made. If anybody reading this is really good with op- amps and driving adc's I could use some help with this part. The new boards I'm making are using a single supply op amp with the common mode tied to VEE, Hope it all works well, also switched to Non- Inverting to raise the Input impedance. I'm hoping that within the next 6 months or less I will have a complete kit ready, Rod, Coil, Control Box, earphones's etc..

I'm shooting for a total price of around $3. BOM which is my goal. Posted by. Marvin James. Nov 2. 5th, 2. 01.

This is very interesting. As a newbie, I would buy this as a kit. Please keep me informed.

Marv. Posted by. Jan 2nd, 2. Please keep me informed.

Posted by. admin. Jan 2nd, 2. 01. 2. Hey guys! Thanks for all the responses I will send you out an update on the progress when I find the time! Posted by. Jan 1. I want to buy XPI.

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Posted by. Feb 2. Posted by. Feb 2. Hi, I am not giving out PCB and Schematic until this project is completely finished.

Right now I am still perfecting the software side of things. Jon. I may start a mailing list to keep people informed. Posted by. John Ossi.

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Feb 2. 7th, 2. 01. PC boards? Posted by. Feb 2. 9th, 2. 01. Keep up the good work. Posted by. Sparky.

Feb 2. 9th, 2. 01. Well it sounds impressive. Do you have any test results? What type of soil, trash rejection, metal selection, target Ident., soil balance, audio volume, LCD readout, coil type and size, power requirement and so on.. Btw I am into electronics (Ham) but also a writer, if you like I would edit your web page. There are a number of typos, spelling etc. I am in Manitoba and heading for Black Hills SD in the spring.

Then later in summer I am going to northern MB for hard rock and tailings. I have a Tesoro and a Garret scorpion plus dry washer, sluice, mini- dredge, Gold Magic wheel . Looking forward to more info. Sparky. Posted by. Feb 2. 9th, 2. 01. Hi Sparky, I do have test results but I won't be posting them.

When I can get a good source for all the parts I need (Control rod, Box, Coils etc..) so things will be consistent across multiple units I will send a number of units out to experienced prospectors around the world for in field testing. They can post the results that they find. That way it's not me.

If I go out and post results their will be no end of loyalist Minelab GPX users defending their unit and criticizing my test methods, timings, coil, ground, em noise in the area, experience,ground balance, etc, etc.. All I will say is that from my experience this unit performs better than a gpx 4. I tested it. I don't have access to a Minelab GPX 5.

As for some details, the display provides access to settings (Time to each of the 6 samples, frequency, flyback blocking time, number of samples to average, Pulse duty cycle, gain(not working yet), sample significance (Similar to minlabs timings, this setting allows you to choose the significance of each of the 5 flyback samples I. E. Early samples for finer gold), Damping(also not working and only currently manually adjustable from a knob on the front), There are lots more settings but I can't think of them now. As far as information displayed on the lcd, besides a host of debugging parameters, the display shows the following information, Battery Voltage, Ground mineralization level,percent likelihood that target is gold (Basis it on the response pattern) and strength of each of the samples as well as an overall strength. Ferros targets are indicated by a lower tone on the ear phones, possible gold targets will give a higher tone while normal or unsure targets will only change volume. I'll send you an email about the website stuff.

Jon. P. S. Will release pics of the unit as soon as I get another camera (my first one gave up the blue smoke). Posted by. ANDREW WIENS. Mar 2nd, 2. 01. 2.

This is so cool a kit. Posted by. alexis. Mar 1. 1th, 2. 01. Hello, Keep me informed when your cool kit XPI is ok : )thanks,Alexis. Drake And Josh Season1 Episode 2. Posted by. Mar 1. Posted by. Mar 1. Hi sounds like what we need!!

I am also a life- long Ham, electronics technician, hobbiest, LDMA GPAA etc, etc. Keep up the fight. I know how hard it is to bring new technology to the market. BTW I spent several years tesying my Co,'s products and modifying them to achieve CE and CSA listing. Posted by. James.

Mar 1. 7th, 2. 01. Hi,I had been lurking on the Geotech forums a while, and was considering a project using the XMOS chip. I was surprised to see your comment and link to your site here. My question is this.

Are you going to opensource your XMOS code or are you planning to kit it for sale? I have looked and looked for ANY code for building an Open Source detector, and the closest I came was a simple program written in assembly. There are a couple detectors on the forum there, but the only code being offered is in hex, for simply burning to a chip, which is irrelevant to me.

If you are planning to offer up the code, I'd be glad to help with the programming and debugging. If not, I understand, but that would send me on to my own path. Thanks in advance!

Posted by. azcurtis. Mar 1. 9th, 2. 01.

Looks to me that you are on the right path. The methology being used on pulse sampling then running average is most excellent. I have been designing circuitry and troubleshooting electronics since after 8th grade. I could most likely help you out with the op amps and other issues as needed. I make my living for the last 2.

Designed a bunch of circuitry through the years using operational amplifiers especially with low noise front ends. I should be able to help you out.

Posted by. Ed Staton. Mar 2. 3rd, 2. 01. Sounds like what I'm looking for. Keep up the good work and keep me informed about your progress. Looking forward to a complete kit soon.