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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > PI Designs & Deepseekers (Moderators: Eugene52, Cornelius) >

Brute force PI

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jakub

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	Brute force PI « on: January 15, 2011, 02:10:13 am »

Hi Guys,

I am building the Chance (Clone PI) and the DBP 2010. I have never formally studied electronics though have done lots of experimentation over the years. I know how to solder and fault find and I am OK at designing basic circuits. I have 2 oscilloscopes (one I built, the

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eoscope

, LCR meter, variable power supplies etc.

What I am looking to do is build a detector where the PI signal is ramped to loads of power. I intend on using NiMH batteries which get up to 3Ah in AA size and up to 11Ah in D size. With batteries such as these I can get away with high current pulses.

The question I ask is how can I modify the Change or the DBP 2010 to give higher current pulses? I know the components can handle a bit more. I can also up the voltage or have multiple power sources going in, if only I had some guidance into what to tinker with...

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jakub

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	Re: Brute force PI « Reply #1 on: January 15, 2011, 06:39:53 am »

I found the missing schematics for the old DPB 2010 on another website and put them here with some cleaned up scans from golddigger1950. So finally there are the full schematics, boards and partlist of the original in one place..

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http://thunting.com/smf/index.php?action=downloads;sa=view;id=222

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xavier

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	Re: Brute force PI « Reply #2 on: January 15, 2011, 07:03:04 am »

Hi Jakub

The problem is not in the pulse output but rather in the receiver on the DBP2010 also this machine was designed for a large coil 1m x 1m so if you want to use it with a small coil there are some mods to be made to it.

Regards Xavier

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So many questions so little time

jakub

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	Re: Brute force PI « Reply #3 on: January 15, 2011, 08:15:59 am »

Xavier, understand you had a bit of an epic journey with getting your DPB 2010 working.

What size coil are you using?

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ram

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	Re: Brute force PI « Reply #4 on: January 15, 2011, 08:35:35 am »

for high power pi, you can modify the output using 24volts. with flyback of 1500volts and higher wattage output, the more complex is to modify the receiver . dbp 2010 is deeper working frequency 90hz-100hz. for big targets using 1x1mtr coil or larger coil for more deep. you can modify it and it depends on your targets.same as delta pulse.

ram,

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xavier

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	Re: Brute force PI « Reply #5 on: January 19, 2011, 02:44:06 pm »

Hi jakub

I did reply to your post but with the new server and all the changes I do believe that my reply to you was lost so I will try to recap as best as I can. The first thing that I had was poor schematics and non corresponding components ( .22 and .022 cap and other that I cant think of at the moment ) then I had a cats whisker (short that got me going for a while ) I also found out that all this bla bla about coils was totally wrong you can't just take the length of wire used and make a smaller coil out of it as your inductance will be totally out even if you resistance is still the same you actually have to change things so as to be able to use a small coil So yes I did go through an epic journey BUT I have learned a lot from it and I also have a detector that is almost the way that I want it to be. I will be posting my version as soon as I can say that I am happy with it ( 280mm coil).

All the best to you
Regards xavier

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So many questions so little time

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