[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    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 numisNGSTopic starter
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 53.0
Firefox 53.0

Awards

VLF
« on: August 11, 2017, 10:33:53 am »
Go Up Go Down
Hello
My TGSL TX amplitude is 5,5 v , is that can make a problem ?

how can I control TX amplitude ?

thank you .

best regards.

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65584.msg320121.html#msg320121


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

Please register for viewing them.

TGSLTX circuit.jpg

« Last Edit: August 11, 2017, 10:52:49 am by numisNGS » 		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
Windows NT 10.0
Windows NT 10.0
Firefox 54.0
Firefox 54.0

Awards
« Reply #1 on: August 11, 2017, 12:56:38 pm »
Go Up Go Down
At what point are you making this measurement and are you using for ground point ?  Are you measuring in AC ?

C1 and C2 are working as a Voltage Doubler.  You should be seeing 2 x the 8v supply or 16Vac.

 Huh?


""1. The basic Colpitts oscillator. Together with the transmit coil attached to J1, it provides a
14.5 kHz low power Tx signal to the coil, audio circuit, -5v converter and a signal to use as a
phase comparison for the receive circuit. Tx amplitude should be in the 16V range.""

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65584.msg320122.html#msg320122

« Last Edit: August 11, 2017, 01:13:51 pm by homefire » 		Logged
Offline numisNGSTopic starter
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 53.0
Firefox 53.0

Awards

VLF
« Reply #2 on: August 11, 2017, 01:09:40 pm »
Go Up Go Down
I made the measurement on TX connector of course with TX Attached to pcb .
one of the TX coil is a ground point . there is no problem about how I did the measurement but I think it's about the circuit it self . I made three TGSL pcbs with the same problem.
I find schematic with 2.2 K VR instead of uysing 2k2 resistor "R1" .
thank you best regards

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65584.msg320124.html#msg320124

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
Windows NT 10.0
Windows NT 10.0
Firefox 54.0
Firefox 54.0

Awards
« Reply #3 on: August 11, 2017, 01:19:27 pm »
Go Up Go Down
2k2 is the same as 2.2KR  Huh??   If your not using the GEOTech schematic I have no ideas. Cheesy

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65584.msg320125.html#msg320125

Logged
Offline numisNGSTopic starter
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 53.0
Firefox 53.0

Awards

VLF
« Reply #4 on: August 11, 2017, 01:27:16 pm »
Go Up Go Down
there is an other schematic R1 is 2k2 variable resistor, instead of using normal 2k2 .
do you think that will help to adjust TX amplitude?
thank you .
best regards

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65584.msg320126.html#msg320126

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
Windows NT 10.0
Windows NT 10.0
Firefox 54.0
Firefox 54.0

Awards
« Reply #5 on: August 11, 2017, 01:44:14 pm »
Go Up Go Down
If you not seeing the 16vac the circuit is not corrector or your power supply has issues. 

Are you getting the 14.5 kHz??   Maybe your Test equipment is loading the circuit ?



Linkback:

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

http://www.thunting.com/smf/index.php/topic,65584.msg320127.html#msg320127

Logged
Offline numisNGSTopic starter
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 34.0
Firefox 34.0

Awards

VLF
« Reply #6 on: August 11, 2017, 02:44:04 pm »
Go Up Go Down
yes I get 14.45khz
and my test gear is respectable.
thank you I will try and tell you some news tomorrow .
thank you homefire.
best regards 

Linkback:

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

http://www.thunting.com/smf/index.php/topic,65584.msg320129.html#msg320129

Logged
Print
Pages: 1    Go Up
Jump to:  

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