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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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Logenxxx

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #270 on: March 25, 2010, 12:23:03 am »

to Marius

you can use the software oscilloscope i uploaded in the download area.
just follow the instruction to use it and it can work.

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raff33

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #271 on: March 25, 2010, 08:33:42 am »

	Quote:	Posted by steaua581
Hello Eugene, I have finished too delta Pulse but im getting also poor detecting...i have used the single side PCB scheme all functions all things acording to your specs but still poor detecting..The Delta runs good but it seems to me instabil.The only thing instead LF357 i used LF356 .Is that the problem?.. My coil is 40 Cm @ 23 Turns , 0,5 wire. I have included a pic of my PCB... Whats wrong? Regards Marius

Hi Marius,
i think you have to correct a mistake , perhaps you inverse C8 - C7 ...
C8 =10uf and C7 =220uf
Regards raff33

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #272 on: March 25, 2010, 11:52:59 am »

Hello Raff
If you look closely they are put in paralell so it doesnt matter they are not inverse....i have checked and double checked the schematic all is in place corectly...
I am still looking to find out what freq should i look for on osciloscope...and more details wherre i should check and what freq values should i have i certain hot spots wich are crucial for a good functionality...especially on that area wherre Eugene sayed """"need check signal at P4 [20k] potentiometer before jfet TLO62 opamp"""
I might ask a friend who has an oscilo to set it right for me...

Regards and Thank you all
Marius

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Eugene52 Topic starter

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #273 on: March 25, 2010, 12:36:46 pm »

	Quote:	Posted by steaua581
Hello Raff If you look closely they are put in paralell so it doesnt matter they are not inverse....i have checked and double checked the schematic all is in place corectly... I am still looking to find out what freq should i look for on osciloscope...and more details wherre i should check and what freq values should i have i certain hot spots wich are crucial for a good functionality...especially on that area wherre Eugene sayed """"need check signal at P4 [20k] potentiometer before jfet TLO62 opamp""" I might ask a friend who has an oscilo to set it right for me... Regards and Thank you all Marius

Great work you guys are doing !! If you borrow an oscilloscope look at the chart below . Do not forget to set your pulse frequency PPS according to where you live .
AC Power lines , 50 cycle mains europe or 60 cycle USA .
HH..........Eugene

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raff33

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #274 on: March 26, 2010, 05:49:57 am »

Hi Eugene ,
what's the prefer resistanse for 1m*1m coil.........?
i built one 1m*1m , 16 tr , 0.50mm ,but .... 5.6 resistanse
regards.........raff33

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #275 on: March 26, 2010, 08:27:36 am »

	Quote:	Posted by raff33
Hi Eugene , what's the prefer resistanse for 1m1m coil.........? i built one 1m1m , 16 tr , 0.50mm ,but .... 5.6 resistanse regards.........raff33

Try only 12 or 13 turns not 16 and re-measure your resistance . Should be near perfect !!!
HH................Eugene

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #276 on: March 26, 2010, 06:45:22 pm »

Hello Eugene 52

I used it but IRF 840 overheated . why ? Cry

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #277 on: March 26, 2010, 07:28:44 pm »

Hi Eugene, can these PI detectors be used underwater or just on dry land? Thanks UPSMANPA

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #278 on: March 26, 2010, 09:04:09 pm »

	Quote:	Posted by upsmanpa
Hi Eugene, can these PI detectors be used underwater or just on dry land? Thanks UPSMANPA

If you build your own PI and make it 100% completely waterproof , from the search coil to and including the control / circuit housing box , It can be used anywhere !!!
HH...........Eugene

	Quote:	Posted by belief
Hello Eugene 52 I used it but IRF 840 overheated . why ?

You are exceeding the Maximum drain Current [Id] rating of 8 amps continuous or 32 amps pulsed [low duty cycle] . You must have a small value resistance in series between power transistor T1 and -12 volt supply , like R51 in the schematic here , also make sure your frequency or pulse rate is set properly .
HH..............Eugene

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	Re: DELTA PULSE / SNIFFER XR71 PULSE INDUCTION METAL DETECTOR « Reply #279 on: March 26, 2010, 09:12:28 pm »

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

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