[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
2
News:
Pages:  1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 33   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 Cornelius
Moderator
Silver Member
*****

marching to the beat of a different drummer
Join Date: Jan, 2009
Thank you33

Activity
0%

Netherlands
Posts: 954
Referrals: 0

4895.00 Gold
View Inventory

Awards
« Reply #30 on: January 07, 2010, 05:56:19 pm »
Go Up Go Down
Al , it could be two wires which are shielded  . If you have two wires individually shielded  , that should work too . Don't worry about this  . Remember that there are two wires going to ( and from ) the coil  . These wires should be shielded  ( with the shield going to ground ) . Wether both wires are shielded  individually is of no importance  .  Cornelius

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg66731.html#msg66731

Logged
Offline alimanTopic starter
Bronze Member
*

Join Date: Dec, 2009
Thank you0

Activity
0%
Male
Canada
Posts: 108
Referrals: 0

590.00 Gold
View Inventory

Awards

Trying to build one
« Reply #31 on: January 07, 2010, 10:33:49 pm »
Go Up Go Down
Thanks again Cornelius !
Another question, how many ohms approx. should the completed 200mm x 20 turns of 26 gauge wire coil, read?

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg66774.html#msg66774

Logged
Offline GoldDigger1950
The Old Man and the Soil
Global Moderator
Platin Member
*****

Just call me GD.
The Old Man and the Soil
Join Date: Jun, 2009
Thank you226

Activity
1%
Male
United States
Posts: 11221
Referrals: 12

47848.00 Gold
View Inventory

Awards

Garrett Groundhog ADS, Garrett Sea Hunter, Bounty Hunter Tracker IV, Bounty Hunter Pioneer 505,Minelab Eldorado Mk II, Tesoro Compadre, Tesoro Tiger Shark & A Few Home Brew Detectors
« Reply #32 on: January 07, 2010, 11:01:06 pm »
Go Up Go Down
Quote:Posted by aliman
Thanks again Cornelius !
Another question, how many ohms approx. should the completed 200mm x 20 turns of 26 gauge wire coil, read?


Resistance makes no difference at all. Impedance is what counts. Wrap as per directions and don't fret over the resistance.

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg66783.html#msg66783

Logged
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.
Let's Talk Treasure!
Offline treasuremomo
micmomo
Bronze Member
*

micmomo
Join Date: Oct, 2009
Thank you0

Activity
0%
Male
United States
Posts: 418
Referrals: 0

1990.00 Gold
View Inventory

Awards

I'VE USED MANY BRANDS AND MODELS-TESORO, WHITES,GARRETT,FISHER,NAUTILUS,D-TEX,WILSON NEUMAN,ETC.
« Reply #33 on: January 07, 2010, 11:40:35 pm »
Go Up Go Down
Hi Cornelius, I've a question to ask you...Would a basic tech/trade school course in electronics be enough schooling in electronics to enable a person to build metal detectors? Or would a person need to be an electronics engineering grad to know his/her stuff well enough to design and build VLF or other type units?  I'm interested in building a VLF or TR unit with good depth and a good discriminator...maybe an ID meter.

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg66799.html#msg66799

Logged
Offline GoldDigger1950
The Old Man and the Soil
Global Moderator
Platin Member
*****

Just call me GD.
The Old Man and the Soil
Join Date: Jun, 2009
Thank you226

Activity
1%
Male
United States
Posts: 11221
Referrals: 12

47848.00 Gold
View Inventory

Awards

Garrett Groundhog ADS, Garrett Sea Hunter, Bounty Hunter Tracker IV, Bounty Hunter Pioneer 505,Minelab Eldorado Mk II, Tesoro Compadre, Tesoro Tiger Shark & A Few Home Brew Detectors
« Reply #34 on: January 07, 2010, 11:52:16 pm »
Go Up Go Down
Quote:Posted by treasuremomo
Hi Cornelius, I've a question to ask you...Would a basic tech/trade school course in electronics be enough schooling in electronics to enable a person to build metal detectors? Or would a person need to be an electronics engineering grad to know his/her stuff well enough to design and build VLF or other type units?  I'm interested in building a VLF or TR unit with good depth and a good discriminator...maybe an ID meter.


If you can solder, read and understand a schematic, you can build a metal detector.

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg66803.html#msg66803

Logged
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.
Let's Talk Treasure!
Offline alimanTopic starter
Bronze Member
*

Join Date: Dec, 2009
Thank you0

Activity
0%
Male
Canada
Posts: 108
Referrals: 0

590.00 Gold
View Inventory

Awards

Trying to build one
« Reply #35 on: January 08, 2010, 07:52:10 am »
Go Up Go Down
Impedance!, that's right.
Thanks  again

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg66835.html#msg66835

Logged
Offline Homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you664

Activity
0%
Male
United States
Posts: 15906
Referrals: 0

52360.00 Gold
View Inventory

Awards
« Reply #36 on: January 08, 2010, 08:30:19 am »
Go Up Go Down
Here is some coil info to give you some Idea's!

Common pulse induction search coils with their physical properties Size Shape Turns Wire size Inductance Resistance

SIZE                     TURNS        WIRE SIZE                INDUCT    RESISTANCE

? 120 mm Round      36 ?     0.40 mm / 0.14 mm2     405 ?H     1.9 Ohm
? 150 mm Round      31 ?     0.40 mm / 0.14 mm2     394 ?H     2.0 Ohm
? 175 mm Round      28 ?     0.40 mm / 0.14 mm2     387 ?H     2.1 Ohm
? 200 mm Round      26 ?     0.40 mm / 0.14 mm2     406 ?H     2.2 Ohm
? 250 mm Round      22 ?     0.40 mm / 0.14 mm2     380 ?H     2.3 Ohm
? 300 mm Round      20 ?     0.50 mm / 0.20 mm2     390 ?H     1.6 Ohm
? 400 mm Round      17 ?     0.50 mm / 0.20 mm2     396 ?H     1.8 Ohm
? 500 mm Round      15 ?     0.50 mm / 0.20 mm2     400 ?H     2.0 Ohm
1.0 x 1.0 m Square    10 ?     0.66 mm / 0.34 mm2     406 ?H     2.0 Ohm
1.4 x 1.4 m Square      8 ?     0.66 mm / 0.34 mm2     387 ?H     2.2 Ohm
1.8 x 1.8 m Square      7 ?     0.80 mm / 0.50 mm2     398 ?H     1.7 Ohm


Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg66841.html#msg66841

Logged
Offline alimanTopic starter
Bronze Member
*

Join Date: Dec, 2009
Thank you0

Activity
0%
Male
Canada
Posts: 108
Referrals: 0

590.00 Gold
View Inventory

Awards

Trying to build one
« Reply #37 on: January 11, 2010, 04:20:07 pm »
Go Up Go Down
YAHOO its here ! Thanks so much Cornelius, the Sandbanks metal detector arrived today. I can't wait to get it up and running. For the power supply could I use two 7.2 v NiCad battery packs instead of the two 9 v batteries ? I also have a small 12v lead acid battery of 9.5 A/h capacity, much heavier though. i've included pic of the batteies.

Aliman

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg67602.html#msg67602


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

Please register for viewing them.

2010_0111Image0045.jpg

Logged
Offline Cornelius
Moderator
Silver Member
*****

marching to the beat of a different drummer
Join Date: Jan, 2009
Thank you33

Activity
0%

Netherlands
Posts: 954
Referrals: 0

4895.00 Gold
View Inventory

Awards
« Reply #38 on: January 11, 2010, 04:26:40 pm »
Go Up Go Down
Ali , that was fast .  Use the two 12V batteries for the besr result .Be careful with the polarities though !!!!!!!! . Have fun with the detector  . Do not consider this a toy , it is NOT .     Cornelius

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg67603.html#msg67603

Logged
Offline alimanTopic starter
Bronze Member
*

Join Date: Dec, 2009
Thank you0

Activity
0%
Male
Canada
Posts: 108
Referrals: 0

590.00 Gold
View Inventory

Awards

Trying to build one
« Reply #39 on: January 11, 2010, 04:45:36 pm »
Go Up Go Down
So, should I use the 12v lead acid battery, not the two 7.2v in series ?

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg67607.html#msg67607

Logged
Print
Pages:  1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 33   Go Up
Jump to:  

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