[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 ... 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 ... 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 1 Guest 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 #170 on: January 26, 2010, 02:40:02 pm »
Go Up Go Down

Aliman  . Dont confuse yourself . There was no short in the circuit when it was sent to you . It worked properly . Where do you have to look ? Well , I would say in the area's you worked on after you received the detector .  Make sure that your IC's are in order . To start I would replace the  TIP 13 A     and the IC 5  , the 741    . You got to try a few things  . Cornelius

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg69329.html#msg69329




Logged
Offline xavier
Platin Member
*

From a rainy Brussels
Join Date: May, 2009
Thank you166

Activity
0%
Male
Belgium
Posts: 7339
Referrals: 0

32206.00 Gold
View Inventory

Awards
« Reply #171 on: January 26, 2010, 02:57:04 pm »
Go Up Go Down

Remember that a strand of wire could have come of when you cut it like for the ground or one of the power wires it does not have to be big to create a lot of S@#T and it always seems to get stuck in the most awkward places that is why I told you to use a brush I had one that took me more than a day to find.  Angry

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg69332.html#msg69332


Xavier


Logged

So many questions so little time

Offline Peti80
Pull Tab
*

Join Date: Nov, 2009
Thank you0

Activity
0%

Hungary
Posts: 23
Referrals: 0

125.00 Gold
View Inventory

Awards
« Reply #172 on: January 26, 2010, 03:13:34 pm »
Go Up Go Down

Ali, first note or take a photo for yourself on how IC4 and IC5 is seated in the PCB, to have it for later reference. As i saw those IC's have a socket, so it's easy to remove them. If so, remove them. Put back the output of the 7905 into the PCB. Switch on. Measure regulator output voltage. If one of the IC's were dead -shorting out the negative rail- now you should have the correct voltage. Can you check that voltage with IC4 and IC5 removed?

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg69338.html#msg69338




« Last Edit: January 26, 2010, 03:33:16 pm by Peti80 »
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 #173 on: January 26, 2010, 03:33:12 pm »
Go Up Go Down

 OK, but IC4 is soldered to the PCB (round can type ) , IC5 is in a socket.
 I'll first try it with out IC5 and measure the Output of 79L05. If it's not -5v I'll remove IC4 and try it again.
Aliman

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg69341.html#msg69341




Logged
Offline xavier
Platin Member
*

From a rainy Brussels
Join Date: May, 2009
Thank you166

Activity
0%
Male
Belgium
Posts: 7339
Referrals: 0

32206.00 Gold
View Inventory

Awards
« Reply #174 on: January 26, 2010, 03:50:42 pm »
Go Up Go Down

YOU are wasting your time (that?s my opinion) I hope that you will replace the IC?s the right way round. I will have no further part in this process of self destruction

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg69342.html#msg69342


Xavier


Logged

So many questions so little time

Offline Peti80
Pull Tab
*

Join Date: Nov, 2009
Thank you0

Activity
0%

Hungary
Posts: 23
Referrals: 0

125.00 Gold
View Inventory

Awards
« Reply #175 on: January 26, 2010, 03:58:59 pm »
Go Up Go Down

Hey Xavier, this is no self destruction. Ali says there are no signs of traces shorting, and the fact that the 7905 output voltage is not dropped down to zero, it's not very likely that there is a hard short. It's only pulled down to 3.4V, so it must be some semiconductor failure, not a direct metallic short. At least this is what the story suggests.

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg69343.html#msg69343




Logged
Offline xavier
Platin Member
*

From a rainy Brussels
Join Date: May, 2009
Thank you166

Activity
0%
Male
Belgium
Posts: 7339
Referrals: 0

32206.00 Gold
View Inventory

Awards
« Reply #176 on: January 26, 2010, 04:08:07 pm »
Go Up Go Down

If he did like I told him he would have seen that the transistor next to the 7905 has rust on all three pins THAT should be removed cleaned and replaced

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg69344.html#msg69344


Xavier


Logged

So many questions so little time

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 #177 on: January 26, 2010, 04:28:42 pm »
Go Up Go Down

 I removed IC5 and checked the Output on 79L05 and it up by 0.25V. So I don't think its IC5 causing the problem.
Xavier are you  talking about TR4, good eye. I'll have to check those pins Thanks. If this dosen't work, I'll remove IC4 and check the output again.

Sorry to everybody for causing a headache, with my Self created problem.
Thousand Pardons

P.S. If nothing else, I've learned that, I new far less about electronics then I thought.
Aliman

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg69348.html#msg69348




Logged
Offline xavier
Platin Member
*

From a rainy Brussels
Join Date: May, 2009
Thank you166

Activity
0%
Male
Belgium
Posts: 7339
Referrals: 0

32206.00 Gold
View Inventory

Awards
« Reply #178 on: January 26, 2010, 04:41:37 pm »
Go Up Go Down

Aliman It was working that we know you did not pop the regulators that we also know if there is a heavy load on the regulators they cut out that we know to IF you think about it there is very little chance that you could have popped any of the components there for it has to be something that you did with your very poor soldering (I don't blame you for it) so look at all that you did go as far as undoing what you did one at a time testing all the time as you go along I can only tell you what you should do I cant do it for you I'm on the other side of the world and you will have to have a lot of patience as these are the most type of problems well one of the worst the worst is intermittent problems

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg69350.html#msg69350


Xavier


Logged

So many questions so little time

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 #179 on: January 26, 2010, 05:41:04 pm »
Go Up Go Down

Ali , you asked me to send you a PCB . I did send you a complete  working detector . Now we are in trouble .  May I give you a last suggestion .   Remove all transistors .  Get an 8 dill socket for the  IC 709  and get the newer version of the 709 that will fit the  socket  .  Renew all IC'S  . Only use  9V batteries . Leave the capacitors and the resistors .  Renew the diodes . This will give you a good result . Cornelius

Linkback:

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

http://www.thunting.com/smf/index.php/topic,10321.msg69366.html#msg69366




Logged
Print
Pages:  1 ... 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 ... 33   Go Up
Jump to:  

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