[x] Welcome at THunting.com!

A fun place to talk about Metal Detecting, Treasure Hunting & Prospecting. Here you can share finds and experience with thousands of members from all over the world

Join us and Register Now - Its FREE & EASY

THunting.com
Treasure Hunting & Metal Detecting Community
   
Advanced Search
*
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
Or Login Using Social Network Account
News:
Pages:  1 ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 ... 91   Go Down
Print
Share this topic on FacebookShare this topic on Del.icio.usShare this topic on DiggShare this topic on RedditShare this topic on Twitter
Tags:
0 Members and 3 Guests are viewing this topic.
Offline Logenxxx
Copper Member
*

Join Date: Dec, 2009
Thank you1

Activity
0%
Male
Philippines
Posts: 25
Referrals: 0

326.00 Gold
View Inventory

Awards
« Reply #270 on: March 25, 2010, 12:23:03 am »
Go Up Go Down

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,28024.msg198739.html#msg198739




Logged
Offline raff33
Copper Member
*

Join Date: Jan, 2009
Thank you1

Activity
0%

Morocco
Posts: 67
Referrals: 0

390.00 Gold
View Inventory

Awards
« Reply #271 on: March 25, 2010, 08:33:42 am »
Go Up Go Down

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,28024.msg198740.html#msg198740




Logged
Offline steaua581
Copper Member
*

Join Date: Feb, 2010
Thank you1

Activity
0%

Romania
Posts: 57
Referrals: 0

335.00 Gold
View Inventory

Awards

radio shack
« Reply #272 on: March 25, 2010, 11:52:59 am »
Go Up Go Down


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,28024.msg198741.html#msg198741



There are 1 attachment(s) in this post which you can not view or download

Please register for viewing them.

DSC08966.jpg


Logged
Offline Eugene52Topic starter
M.D. Electronic Builders Club
Moderator
Gold Member
*****

Mood:Happy
Happy

M.D. Electronic Builders Club
Join Date: Dec, 2008
Thank you397

Activity
0%
Male
United States
Posts: 2630
Referrals: 0

17957.00 Gold
View Inventory

Awards

Teknetics , Fisher , Discovery3300 and TIANXUN 19 kHz VLF Metal Detector
« Reply #273 on: March 25, 2010, 12:36:46 pm »
Go Up Go Down

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,28024.msg198742.html#msg198742



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

Offline raff33
Copper Member
*

Join Date: Jan, 2009
Thank you1

Activity
0%

Morocco
Posts: 67
Referrals: 0

390.00 Gold
View Inventory

Awards
« Reply #274 on: March 26, 2010, 05:49:57 am »
Go Up Go Down

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,28024.msg198743.html#msg198743




Logged
Offline Eugene52Topic starter
M.D. Electronic Builders Club
Moderator
Gold Member
*****

Mood:Happy
Happy

M.D. Electronic Builders Club
Join Date: Dec, 2008
Thank you397

Activity
0%
Male
United States
Posts: 2630
Referrals: 0

17957.00 Gold
View Inventory

Awards

Teknetics , Fisher , Discovery3300 and TIANXUN 19 kHz VLF Metal Detector
« Reply #275 on: March 26, 2010, 08:27:36 am »
Go Up Go Down

Quote:Posted by raff33
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


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,28024.msg198744.html#msg198744




Logged

Let's Talk Treasure right here on Thunting.com

Offline belief
Pull Tab
*

Join Date: Jun, 2009
Thank you1

Activity
0%

Iran, Islamic Republic of
Posts: 21
Referrals: 0

105.00 Gold
View Inventory

Awards

miner-4
« Reply #276 on: March 26, 2010, 06:45:22 pm »
Go Up Go Down

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,28024.msg198745.html#msg198745




Logged
Offline upsmanpa
Silver Member
*

Life's A Garden Dig It!
Join Date: Mar, 2010
Thank you0

Activity
0%
Male
United States
Posts: 671
Referrals: 0

2250.00 Gold
View Inventory

Awards
« Reply #277 on: March 26, 2010, 07:28:44 pm »
Go Up Go Down

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,28024.msg198746.html#msg198746




Logged
Offline Eugene52Topic starter
M.D. Electronic Builders Club
Moderator
Gold Member
*****

Mood:Happy
Happy

M.D. Electronic Builders Club
Join Date: Dec, 2008
Thank you397

Activity
0%
Male
United States
Posts: 2630
Referrals: 0

17957.00 Gold
View Inventory

Awards

Teknetics , Fisher , Discovery3300 and TIANXUN 19 kHz VLF Metal Detector
« Reply #278 on: March 26, 2010, 09:04:09 pm »
Go Up Go Down

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 ?   Cry


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,28024.msg198747.html#msg198747



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

Offline upsmanpa
Silver Member
*

Life's A Garden Dig It!
Join Date: Mar, 2010
Thank you0

Activity
0%
Male
United States
Posts: 671
Referrals: 0

2250.00 Gold
View Inventory

Awards
« Reply #279 on: March 26, 2010, 09:12:28 pm »
Go Up Go Down

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,28024.msg198748.html#msg198748




Logged
Print
Pages:  1 ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 ... 91   Go Up
Jump to:  

Powered by SMF 1.1.19 | SMF © 2005, Simple Machines | Sitemap
Copyright THunting.com