[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 2 3 4   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 1 Guest are viewing this topic.
Offline coldanTopic starter
Pull Tab
*

Join Date: Jul, 2014
Thank you0

Activity
0%
Posts: 9
Referrals: 0

60.00 Gold
View Inventory
Windows 7/Server 2008 R2
Windows 7/Server 2008 R2
Firefox 52.0
Firefox 52.0

Awards

Clone PI
« on: April 13, 2017, 03:32:54 pm »
Go Up Go Down
Hi,
i finished this metal detector and i have problem. If i turn it on, the metal detector is screaming. If i want to detect the metal crap, the detector change screaming to beeping. I chanded BF245c for BS170. LF353 replaced with (TL072, TL082). Can me someone help with this problem? My opinion is thats coil is tuned wrong. Sorry for my bad english. THX

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65180.msg318119.html#msg318119

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

Join Date: Jan, 2009
Thank you662

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

52360.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 52.0
Firefox 52.0

Awards
« Reply #1 on: April 13, 2017, 04:11:43 pm »
Go Up Go Down
TGSL ?   Did you Buy the PCB ?  Tell us a bit more.  A photo of your build would be good.

Posted on: April 13, 2017, 04:09:51 pm
  Did you Null the Coil using a Scope or Just a Meter ?

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65180.msg318123.html#msg318123

Logged
Offline coldanTopic starter
Pull Tab
*

Join Date: Jul, 2014
Thank you0

Activity
0%
Posts: 9
Referrals: 0

60.00 Gold
View Inventory
Linux
Linux
Firefox 45.0
Firefox 45.0

Awards

Clone PI
« Reply #2 on: April 14, 2017, 03:09:09 pm »
Go Up Go Down
PCB is homemade. I have problem like this

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

! Youtube video
is the same problem. Its problem with coil or with electronics? I don't have scope, i tried soundcard like scope.
I replaced transistors with BC547b/BC557b. (i have 2n2222 in plastic TO92, but 2n2907 in metal case) so i used these BC transistors.
BF245C replaced with BS170.
LM308 replaced with NE5534 and LF353 with TL082/TL072. Other parts are originals of schematic.
So please help me, i want to finish this project.
Thank you very much.

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65180.msg318143.html#msg318143

« Last Edit: April 14, 2017, 03:20:07 pm by coldan » 		Logged
Offline Homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you662

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

52360.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 52.0
Firefox 52.0

Awards
« Reply #3 on: April 14, 2017, 03:20:49 pm »
Go Up Go Down
   The coil seems to present difficulties to a lot of builders.  Without more information not much we can do for you.  Did you build coil as per Instructions ?

Look in here for Complete Info.  

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

http://www.geotech1.com/forums/showthread.php?15710-TGSL-Complete-Details


Did you build step by step confirming each section was working ?

We will have to go through your build step by step section by section to correct this if it's not the coil.

HF

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65180.msg318145.html#msg318145

« Last Edit: April 14, 2017, 03:23:01 pm by homefire » 		Logged
Offline coldanTopic starter
Pull Tab
*

Join Date: Jul, 2014
Thank you0

Activity
0%
Posts: 9
Referrals: 0

60.00 Gold
View Inventory
Windows 7/Server 2008 R2
Windows 7/Server 2008 R2
Chrome 57.0.2987.133
Chrome 57.0.2987.133

Awards

Clone PI
« Reply #4 on: April 16, 2017, 05:17:45 pm »
Go Up Go Down
I measured detector with soundcard scope.
Picture 1: TX oscillator - sine look good i think
Picture 2: pin 6 of CD4024
Picture 3. Sine for -5V
Picture 4. Signal of RX Coil. I don't know, how good is soundcard for this measuremen. But this signal look bad.
Picture 5. Signal on TR4 Gate. It look too bad. I tried change TL082 with TL072 with the same result.

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65180.msg318184.html#msg318184


There are 5 attachment(s) in this post which you can not view or download

Please register for viewing them.

ctyrka.jpg
dvojka.jpg
gate.jpg
jednicka.jpg
minuspetv.jpg

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

Join Date: Jan, 2009
Thank you662

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

52360.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 52.0
Firefox 52.0

Awards
« Reply #5 on: April 16, 2017, 06:21:40 pm »
Go Up Go Down
Picture 5. Signal on TR4 Gate. It look too bad. I tried change TL082 with TL072 with the same result.  Not sure if that signal is bad or the Card O Scope is doing that.  Will it change if you move your Trigger levels ?  Guess you can't do that on that scope program.    Can you show a screen shot of both TX and RX coils at the same time. NO TARGET ?



Linkback:

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

http://www.thunting.com/smf/index.php/topic,65180.msg318186.html#msg318186

Logged
Offline numisNGS
Copper Member
*

Join Date: Aug, 2014
Thank you1

Activity
0%

Algeria
Posts: 80
Referrals: 0

175.00 Gold
View Inventory
Windows 7/Server 2008 R2
Windows 7/Server 2008 R2
Firefox 52.0
Firefox 52.0

Awards

VLF
« Reply #6 on: April 19, 2017, 04:08:30 am »
Go Up Go Down
OK homefire you're rigth but I'm not this member I used his video I get the same problem continious beeping sound with TGSL EDU not with TGSL V.3
I did some changes on the pcb I used 7660 IC and 7905 to get exactelly -5v as this schematic show and I measure voltages on all Ics power is +8v and -5.01
oscillator frequency 14.40 KHz Rx attached to J1 13.85KHz then palce it in its place with 15nf , Tx inductance 5.85 mh Rx inductance 6.45 mh. I got this sound with or without rx coil and with or without  
this Ics U101,U102,U103,U104,U105ic included 7660 used in -5v converter . but when I remove U100 or TX coil OR U106, U107. there will be no sound .I double checked all compenents all are 2% of tollerence .cheked transistors of the audio block they work properly. they also get 453 hz from IC U100.
is there any other compenent that control the audio block ,
please help me
best regards

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65180.msg318286.html#msg318286

« Last Edit: April 19, 2017, 04:12:05 am by numisNGS » 		Logged
Offline Homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you662

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

52360.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 52.0
Firefox 52.0

Awards
« Reply #7 on: April 19, 2017, 08:11:34 am »
Go Up Go Down
   WIll do some checking .  Back when I Can. Tongue

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65180.msg318293.html#msg318293

Logged
Offline numisNGS
Copper Member
*

Join Date: Aug, 2014
Thank you1

Activity
0%

Algeria
Posts: 80
Referrals: 0

175.00 Gold
View Inventory
Windows 7/Server 2008 R2
Windows 7/Server 2008 R2
Firefox 30.0
Firefox 30.0

Awards

VLF
« Reply #8 on: April 22, 2017, 01:15:50 pm »
Go Up Go Down
OK homefire thank you but don't forget me I have no one to helpe me in this problem .please
best reggards


Linkback:

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

http://www.thunting.com/smf/index.php/topic,65180.msg318374.html#msg318374

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

Join Date: Jan, 2009
Thank you662

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

52360.00 Gold
View Inventory
Windows NT 10.0
Windows NT 10.0
Firefox 52.0
Firefox 52.0

Awards
« Reply #9 on: April 22, 2017, 01:19:16 pm »
Go Up Go Down
   What Test Equipment do you have at hand ?  A Oscope I hope ?

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65180.msg318375.html#msg318375

Logged
Print
Pages:  1 2 3 4   Go Up
Jump to:  

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