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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Modifications, Do It Yourself & Repairs (Moderators: Eugene52, xavier, GoldDigger1950) >

XR71 Operation Help

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Eugene52 Topic starter

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Teknetics , Fisher , Discovery3300 and TIANXUN 19 kHz VLF Metal Detector

	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #280 on: March 26, 2010, 09:23:32 pm »

	Quote:	Posted by upsmanpa
Eugene, I don't know if you saw my previous post, can this MD be used underwater or just on dry land? Thank you, upsmanpa

A PI PULSE INDUCTION METAL DETECTOR CAN BE USED UNDERWATER AND ON DRY LAND !!!!
In Fact , PI metal detectors are used more underwater then conventional VLF type metal detectors .

Best Regards.........HH.......Eugene

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #281 on: March 26, 2010, 09:33:16 pm »

Eugene, what is the maximum current drain of the delta pulse? my pi is weak.
thanks Logen

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Eugene52 Topic starter

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #282 on: March 26, 2010, 10:12:00 pm »

	Quote:	Posted by Logenxxx
Eugene, what is the maximum current drain of the delta pulse? my pi is weak. thanks Logen

The total current [IT] will depend alot on your pulse width setting or [transmit pulse on time] . If your PI is weak you may have other problems like with your search coil inductance or low circuit [opamp] gain .
A properly functioning Delta Pulse should give you excellent results .
HH...........Eugene

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #283 on: March 26, 2010, 10:14:18 pm »

Thanks Eugene! Are you saying you will be building these waterproof MD for sale in the near future?

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #284 on: March 26, 2010, 10:30:52 pm »

thanks Eugene
actually my Delta pulse pi current drain is only 140milliamperes maximum at maximum settings, is this the maximum current drain of the project?
thanks again for your support

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Eugene52 Topic starter

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #285 on: March 26, 2010, 11:08:54 pm »

	Quote:	Posted by Logenxxx
thanks Eugene actually my Delta pulse pi current drain is only 140milliamperes maximum at maximum settings, is this the maximum current drain of the project? thanks again for your support

Hello . 140 milliamps maximum is not bad , but if you are not detecting deep then it sounds like you just have some minor problems , potentiometers , gain,etc . . See the zip file attachment I posted right here .
HH..........Eugene

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There are 1 attachment(s) in this post which you can not view or download Please register for viewing them. Delta Sniffer xr71 single side pcb ready to build FINAL 11-19-09.zip
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md5008

	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #286 on: March 29, 2010, 07:15:45 am »

i finish my delta pulse it has normal deep but its very unstable

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #287 on: March 29, 2010, 12:21:23 pm »

Dear Eugene52

Your uploaded PCB board has one mistake, I demonstrated it by the below photo. I think we can't find one metal detector circuit, without problem unfortunately. Angry

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There are 1 attachment(s) in this post which you can not view or download Please register for viewing them. Mistake.jpg
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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #288 on: March 29, 2010, 02:26:51 pm »

hi eugene52
I built the original unmodified circuit because I can not get the diode ST TH1210D Undecided

(What is diode Equivalent)
I use the file 60 cm 25 mm screw 0,5
The beginning of the work but a shortrange to 60 cm metal box 20 cm / 20 cm, but separated coil for one second
Then i change (irf740) and vd3, vd4
new it emit Beeps continuously
If I change the (threshold) stops the sound ( no detect!)it does not work now
What are the amendments that I can do to get a good result
and what is good freqancly to use
and you can send photo to signal at pins 5 and 9 to ua 556
What do you recommend?

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Logenxxx

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #289 on: March 30, 2010, 05:05:41 am »

Hello Peshamar!
Your uploaded picture of the PCB is really a mistake bec. it is a short in the circuit. However, i removed that short after etching my pcb.

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