[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.

Login with email, password and session length
Or Login Using Social Network Account
News:
Pages:  1 2   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 mercersTopic starter
Pull Tab
*

Join Date: Jun, 2009
Thank you0

Activity
0%
Posts: 16
Referrals: 0

80.00 Gold
View Inventory

Awards
« on: July 08, 2009, 02:49:44 pm »
Go Up Go Down

 Hello Is this schematics any good.

Linkback:

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

http://www.thunting.com/smf/index.php/topic,6326.msg38308.html#msg38308




« Last Edit: July 08, 2009, 03:46:29 pm by Christian »
Logged
Offline Christian
Administrator
Platin Member
*****

Wuf! Wuf!
Join Date: Sep, 2006
Thank you15

Activity
100%
Male
Independent Rouge States
Posts: 5173
Referrals: 0

2225.00 Gold
View Inventory

WWW Awards
« Reply #1 on: July 08, 2009, 03:50:15 pm »
Go Up Go Down

Well, if you could let us know please what this shematic is for in teh first place, this would help. Thank you

Linkback:

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

http://www.thunting.com/smf/index.php/topic,6326.msg38327.html#msg38327




Logged

THunting.com - Your Friendly One Stop Treasure Resource

Offline mercersTopic starter
Pull Tab
*

Join Date: Jun, 2009
Thank you0

Activity
0%
Posts: 16
Referrals: 0

80.00 Gold
View Inventory

Awards
« Reply #2 on: July 08, 2009, 03:53:54 pm »
Go Up Go Down

Christian It for a mangenometer
mercers

Linkback:

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

http://www.thunting.com/smf/index.php/topic,6326.msg38329.html#msg38329




Logged
Offline willy bayot
Bronze Member
*

Join Date: Apr, 2009
Thank you0

Activity
0%
Male
Belgium
Posts: 107
Referrals: 0

690.00 Gold
View Inventory

WWW Awards
« Reply #3 on: July 09, 2009, 07:49:42 am »
Go Up Go Down

Hi,

Is this the schematics of an operational PPM system?
If it is, when was it designed and built?

Willy

Linkback:

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

http://www.thunting.com/smf/index.php/topic,6326.msg38373.html#msg38373




Logged
Offline Eugene52
M.D. Electronic Builders Club
Global Moderator
Gold Member
*****

M.D. Electronic Builders Club
Join Date: Dec, 2008
Thank you2

Activity
10%
Male
United States
Posts: 2242
Referrals: 0

15321.00 Gold
View Inventory

Awards

Whites Mxt Pro
« Reply #4 on: July 09, 2009, 10:36:19 am »
Go Up Go Down

Quote:Posted by willy bayot
Hi,

Is this the schematics of an operational PPM system?
If it is, when was it designed and built?

Willy


Hello . About 5 months ago I saw all those schematics on a Website I forgot about . It would be nice if someone posted the link that has more information . Maybe the project was never completed ?....Regards.......Eugene

Linkback:

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

http://www.thunting.com/smf/index.php/topic,6326.msg38383.html#msg38383




Logged
Offline willy bayot
Bronze Member
*

Join Date: Apr, 2009
Thank you0

Activity
0%
Male
Belgium
Posts: 107
Referrals: 0

690.00 Gold
View Inventory

WWW Awards
« Reply #5 on: July 09, 2009, 11:37:29 am »
Go Up Go Down

This is a smart piece of analog circuitry and is based on unsophisticated and cheap components. Thus, it could possibly be used for lab experimentations in magnetic field measurements but I already see a few potential (real!) problems in it if it would be used for any practical use:
1. Polarization switching through relay will shortly give operational problems due to the fast wearing of its contacts.
2. Frequency measurement by period counting is very prone to imprecision due to spikes in the amplified signal.
3. Even in the high resolution mode of 0.1Hz, this can only give a precision of 2.5nT in the best case.
4. The pre-set measurement period of 8 seconds is incompatible with a walking operator
5. The lack of measurement recording or even of any potential connectio to an external data logger makes this system unusable for surveys.

It would be easy to cure the problem 1 by replacing the relay by a few HEXFET's making the switching perfectly static.
The problem 2 is MUCH more difficult to solve without any data processor. You just need to cross your fingers and hope that the environmental noise does not generate any spikes. A single signal period missed or added generates an error of 23nT!!!
With such a circuit, I do not think it would be possible to get a precision down to 1nT, thus, the problem 3 is not really solvable on this base.
The problem 4 is not really a problem provided the right type of proton-rich fluid is being used allowing a much shorter polarization period to be used.
The problem 5 needs to be solved by the use of a digital processor in order to at least provide a serial link to an external data logger.

Willy

Linkback:

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

http://www.thunting.com/smf/index.php/topic,6326.msg38386.html#msg38386




« Last Edit: July 09, 2009, 11:39:01 am by willy bayot »
Logged
Offline goldigger
Silver Member
*

Join Date: Jun, 2009
Thank you0

Activity
0%
Male
Canada
Posts: 1126
Referrals: 0

5405.00 Gold
View Inventory

Awards

Bounty  Hunter and several more.
« Reply #6 on: July 10, 2009, 07:33:00 am »
Go Up Go Down

mercers;

It looks vaguely familiar.... I want to study it before replying. Its kind of small, on my lap top
Aspire-one... my picture view is 4.5 by 7.625 inches and the schematics are about 2x2 in!

I take stuff to my desk top and look at them with a 17 in monitor, lots of difference!

Brian AKA goldigger (cautious, too)

Linkback:

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

http://www.thunting.com/smf/index.php/topic,6326.msg38439.html#msg38439




Logged

goldigger

Offline mercersTopic starter
Pull Tab
*

Join Date: Jun, 2009
Thank you0

Activity
0%
Posts: 16
Referrals: 0

80.00 Gold
View Inventory

Awards
« Reply #7 on: July 14, 2009, 10:47:04 am »
Go Up Go Down

 [hello]I have no idea
Mercers

Linkback:

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

http://www.thunting.com/smf/index.php/topic,6326.msg38678.html#msg38678




Logged
Offline mercersTopic starter
Pull Tab
*

Join Date: Jun, 2009
Thank you0

Activity
0%
Posts: 16
Referrals: 0

80.00 Gold
View Inventory

Awards
« Reply #8 on: July 14, 2009, 10:49:54 am »
Go Up Go Down

 Hello Golddigger
Can i try to build it or is it goneing to be a waste of time
Mercers

Linkback:

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

http://www.thunting.com/smf/index.php/topic,6326.msg38679.html#msg38679




Logged
Offline goldigger
Silver Member
*

Join Date: Jun, 2009
Thank you0

Activity
0%
Male
Canada
Posts: 1126
Referrals: 0

5405.00 Gold
View Inventory

Awards

Bounty  Hunter and several more.
« Reply #9 on: July 14, 2009, 11:12:51 am »
Go Up Go Down

mercers;

I hate to say yes-or-no on should-YOU-use-it, I would not, as the system is old, it probably worked OK, but there are better schemes, available. The counter idea is archaic.

I, personally speaking, here, would rather use phase detection and convert the response to digital with an ADC.... this allows many more advantages. Not that my circuitry would be much less complex, probably.

Yes, I also, have seen this very circuit , some where, before..... it was used as an OUTMODED example, that employing a counter. I wonder how it got into active circulation, represented as a viable system???

I hope this helps.

Brian AKA goldigger

Linkback:

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

http://www.thunting.com/smf/index.php/topic,6326.msg38682.html#msg38682




Logged

goldigger

Print
Pages:  1 2   Go Up
Jump to:  

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