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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) >

DBP2010

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Paul A Topic starter

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	DBP2010 « on: August 12, 2010, 06:45:35 am »

Hi X,
I'm pretty surprised that you had problems with the 2010 coils.
Are you sure that the coil is the problem?
Exactly what problems are you experiencing? no depth? instability?
I had MANY stability problems with the Magenta P.I. that I built.
I thought it was the coil but it turned out to be as simple as one of the I.C. sockets I'd used!
Took me hours to find it though!

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	DBP2010 « Reply #1 on: August 12, 2010, 07:56:16 am »

Paul I'm not sure any more I have replaced all the components I have made many different coils with different inductance ranging from 330uH to 2mH (0.7 Ohm to 5 Ohms) and used 3 different wire gauge 0.5mm 0.8mm and 0.9mm all have resulted in a very poor detection depth for a tuna tin 250 gr job about 35cm a coin +- 5cm but what I must tell you is I never replaced the IC sockets and I used two coil size 230mm and 280mm now I will remove the IC sockets and see if that will make a difference.

Regards Xavier

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	DBP2010 « Reply #2 on: August 12, 2010, 11:59:44 am »

Hi X,
Are you able to test the current going into the coil?
This sounds like a similar problem that I had, down to a faulty power transistor.

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	DBP2010 « Reply #3 on: August 12, 2010, 02:39:32 pm »

Hi Paul

Well I removed all the sockets and still the same as for the power transistor I replaced it too it's a 2n3773. Thanks for your help Paul I will have a look at the current going to the coil. Mind you I can hear the coil vibrating (small coil 235 uH 0.8 wire)

Regards Xavier

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	DBP2010 « Reply #4 on: August 12, 2010, 03:43:18 pm »

Hi X,
Don't know if you are aware but there is apparently a small error on the P.C.B.
It's covered somewhere on here, but I can't seem to find it at the moment.......

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	DBP2010 « Reply #5 on: August 12, 2010, 04:07:41 pm »

Ho I did not know then that could very well be it then. Thanks Paul I will have a look to see if I cant find it otherwise I will have to track it down and that could take me a while Grin

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	DBP2010 « Reply #6 on: August 12, 2010, 04:22:45 pm »

	Quote:	Posted by xavier
Ho I did not know then that could very well be it then. Thanks Paul I will have a look to see if I cant find it otherwise I will have to track it down and that could take me a while Regards Xavier

Eugene will know. He's probably the one who found the error. He's spent hundreds of hours verifying schematics against boards.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.

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	DBP2010 « Reply #7 on: August 12, 2010, 04:43:22 pm »

Thanks GD I will ask him

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	DBP2010 « Reply #8 on: August 12, 2010, 11:55:28 pm »

Hi X,
Found it!

"I find a small error on delta pulse part replacement diagram that I send
please careuful about this and correct. there must not connection beetwen 1n4148 and 27 k I attached picture.

Somebody make error when copying from original."

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Fingers Crossed!

Paul

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	Re: DBP2010 « Reply #9 on: August 13, 2010, 03:57:43 am »

Hi Paul

Well as you can see I moved the topic but in the process I seem to have lost the VLF topic and my last post so here I go again the Delta board is not the same as the DBP2010 how ever I do have more info for you when I power up the unit I get a nice audio signal for about 2 sec and the same when I power off but when I bring a metallic object near the coil I get an audio signal that sounds like a rooster being choked it sounds like it's being held back on the receiver side a bit like a clogged water pipe. Do you understand what I'm trying to explain to you? and do you want me to post some photos of it?

Regards Xavier

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