Treasure Hunting & Metal Detecting Community

Welcome, Guest! Please login or register HERE - It is FREE and easy. Only registered users can post and view images on our message boards. Did you miss your activation email?
Login with email, password and session length Caps lock is activated.		Or Login Using Social Network Account

News:

It appears you have not registered with our community yet. Guests can not uses all functions of the forum. They can not post, view attachements or access our download areas etc. To register please click here ...

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

Pages: 1 ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 ... 89 Go Down

← previous next →

Tags:

0 Members and 11 Guests are viewing this topic.

Logenxxx

Copper Member

Join Date: Dec, 2009

Activity

Posts: 25
Referrals: 0

326.00 Gold
View Inventory

	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.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,2887.msg80743.html#msg80743


	Logged

raff33

Copper Member

Join Date: Jan, 2009

Activity

Posts: 67
Referrals: 0

390.00 Gold
View Inventory

	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

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,2887.msg80814.html#msg80814


	Logged

steaua581

Copper Member

Join Date: Feb, 2010

Activity

Posts: 57
Referrals: 0

335.00 Gold
View Inventory

radio shack

	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

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,2887.msg80862.html#msg80862

There are 1 attachment(s) in this post which you can not view or download Please register for viewing them. DSC08966.jpg
	Logged

Eugene52 Topic starter

M.D. Electronic Builders Club
Moderator
Gold Member

Mood:Happy
Happy

M.D. Electronic Builders Club
Join Date: Dec, 2008

400

Activity

Posts: 2630
Referrals: 0

17957.00 Gold
View Inventory

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

	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

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,2887.msg80870.html#msg80870

There are 1 attachment(s) in this post which you can not view or download Please register for viewing them. Delta Pulse diagram.jpg
	Logged

Let's Talk Treasure right here on Thunting.com

raff33

Copper Member

Join Date: Jan, 2009

Activity

Posts: 67
Referrals: 0

390.00 Gold
View Inventory

	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

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,2887.msg81063.html#msg81063


	Logged

Eugene52 Topic starter

M.D. Electronic Builders Club
Moderator
Gold Member

Mood:Happy
Happy

M.D. Electronic Builders Club
Join Date: Dec, 2008

400

Activity

Posts: 2630
Referrals: 0

17957.00 Gold
View Inventory

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

	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

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,2887.msg81091.html#msg81091


	Logged

Let's Talk Treasure right here on Thunting.com

belief

Pull Tab

Join Date: Jun, 2009

Activity

Posts: 21
Referrals: 0

105.00 Gold
View Inventory

miner-4

	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

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,2887.msg81223.html#msg81223


	Logged

upsmanpa

Silver Member

Life's A Garden Dig It!
Join Date: Mar, 2010

Activity

Posts: 671
Referrals: 0

2250.00 Gold
View Inventory

	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

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,2887.msg81233.html#msg81233


	Logged

Eugene52 Topic starter

M.D. Electronic Builders Club
Moderator
Gold Member

Mood:Happy
Happy

M.D. Electronic Builders Club
Join Date: Dec, 2008

400

Activity

Posts: 2630
Referrals: 0

17957.00 Gold
View Inventory

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

	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

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,2887.msg81252.html#msg81252

There are 3 attachment(s) in this post which you can not view or download Please register for viewing them. Delta%20Pulse_XR71_sch.jpg IRF740.pdf IRF840..pdf
	Logged

Let's Talk Treasure right here on Thunting.com

upsmanpa

Silver Member

Life's A Garden Dig It!
Join Date: Mar, 2010

Activity

Posts: 671
Referrals: 0

2250.00 Gold
View Inventory

	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

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,2887.msg81256.html#msg81256


	Logged

Pages: 1 ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 ... 89 Go Up

← previous next →

Jump to: