northwest My DIY metal detector project
Welcome, Guest. Please login or register.
Sunday April 30 2017 19:10:56 AEST PM
Home Help Login Register
News: forum firewall bad behaviour Cloudflare Bot scout
Welcome to the Australianelectronicgoldprospectingforum founded in July 2010, an add free totally independent forum with over 70 boards and paid for and managed by the Admin.Total forum Topics:8,708 Total forum Posts:41,460 Members: 655 Total page views:8,000,164  Admin and  forum and domain name owner :marjen at optusnet.com.au. Guests can only see a limited number of boards at present and cannot see any links. Guest cannot post and never will be permitted too!Registration of new members must be approved by admin.Anyone known to have any past or present association with Codan/ML or acting on their behalf as a proxy or intermediary  will not have their registration approved. All  original Photos and posts and  original materials displayed on this site are COPYRIGHTED and remain the property of the poster and the australianelectronicgoldprospectingforum.com. All messages on this forum express the personal views of the author and should not be interpreted as necessarily being in accord with those of the forum owner and neither the owner of this forum and its domain name nor SMF or the forum software developers or the forum host shall be held responsible for the content of any message. Admin reserves the right to remove any offensive or objectionable posts. No defamatory material or politics/religion or issues of race will be permitted.
Another satisfied QED user!
QED user report for 9 days detecting! User loves it, found it easy to use,found gold with it and he prefers it to his 5000! Also a report on a QED used at the beach for coin shooting.QED users reporting in with their multi ounce gold finds with the QED!
QED is here! ML have NOT stopped the QED!
The QED pictured is backward compatible with the current QED and has been designed and made by a member here. The firmware and circuit are identical with the current version except for a change in the face plate and control box. Changing to this configuration will NOT void the warranty when performed by the control box designer as it has been endorsed, approved and authorized by the QED manufacturer. The 4th button will not work at this time as the  firmware update for that has not been created yet and when its available will be provided free of charge (other than postage costs)by BW.

Goldsearch Australia has been appointed the Australian Distributor for the QED. QED info on the Goldsearch website has been updated.
This is the only forum where you can talk directly with the designer/ manufacturer of the QED and  also some very experienced QED users.
Jrbeatty and Reg Wilson  and  Yellowfin  (or Doug here for that matter!)have NO vested  or pecuniary interests(or secret deals or cash for comment or any other undisclosed benefits )in the QED other than using it to find gold which it is doing very successfully!

australian electronic gold prospecting forum.com  |  DIY forum  |  DIY forum  |  Topic: My DIY metal detector project 0 Members and 1 Guest are viewing this topic. « previous next »
Pages: [1] 2 3 4 5 6 7 8 Go Down Print
Author Topic: My DIY metal detector project  (Read 4565 times)
harry dalek
Newbie

Offline Offline

Posts: 88


« on: Sunday December 8 2013 22:10:41 AEDT PM »

Hi i am new to this forum and i sort of got the bug to do some metal detecting so am going to try and make one.
I like the look of this design very simple and just uses 1 556 cmos version of the chip the old 555 timer .

The making of the units electronics is no real problem i do want it to look ok to take out in public so thats the hard part !

I like the idea i have seen of using crutchers the type with the arm holders for the pole ...so far the best i can think of for housing the double D coils is a  frisbee  and filling it with resin and painting later so this part of it is hard for me..... the look.
Logged
harry dalek
Newbie

Offline Offline

Posts: 88


« Reply #1 on: Sunday December 8 2013 22:12:55 AEDT PM »

Heres my circuit just used a PCB off cut
Logged
harry dalek
Newbie

Offline Offline

Posts: 88


« Reply #2 on: Sunday December 8 2013 22:14:52 AEDT PM »

Going to use this of shf down converter case used for the old pay tv antennas for my circuit and batteries..
Logged
harry dalek
Newbie

Offline Offline

Posts: 88


« Reply #3 on: Sunday December 8 2013 22:19:05 AEDT PM »

This is not mine but what i think i am going to try and make it look like using the crutches idea ...so far i have only found the other older type but i want these i will check out my local dump shed shops .
Logged
Doug
Administrator
Revered Supreme Hero Member
*******
Offline Offline

Posts: 15445



« Reply #4 on: Sunday December 8 2013 22:19:46 AEDT PM »

So its  a vlf IB detector?If it has no ground balance then you will only able to use it at the beach on dry sand or where their  is no mineralization in the soil.
doug smile
Logged

All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin The QED contains NO patented or protected IP!!! No fake users on this site! This forum does not depend on  guest posting liars to survive!1/2 wit powerless to login and post! LO
Doug
Administrator
Revered Supreme Hero Member
*******
Offline Offline

Posts: 15445



« Reply #5 on: Sunday December 8 2013 22:27:41 AEDT PM »

Here is a link to  more metal detector projects
  
doug smile
Logged

All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin The QED contains NO patented or protected IP!!! No fake users on this site! This forum does not depend on  guest posting liars to survive!1/2 wit powerless to login and post! LO
harry dalek
Newbie

Offline Offline

Posts: 88


« Reply #6 on: Sunday December 8 2013 22:32:34 AEDT PM »

Yes by the sounds of it ,i don't know that much about what works where ,i know there are different types of metal detectors ...to me it sounds like golf clubs you use a different detector for different areas ?
If there is a type that is better for soil work i will do some more studying ...as i am petty new to all this.
Logged
Doug
Administrator
Revered Supreme Hero Member
*******
Offline Offline

Posts: 15445



« Reply #7 on: Sunday December 8 2013 22:44:04 AEDT PM »

  
Yes by the sounds of it ,i don't know that much about what works where ,i know there are different types of metal detectors ...to me it sounds like golf clubs you use a different detector for different areas ?
If there is a type that is better for soil work i will do some more studying ...as i am petty new to all this.

If you want a detector that will work over soils with mineralization then you are talking about something with much more complicated circuits because you need a method to cancel the effects of ground minerals.
doug smile
Logged

All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin The QED contains NO patented or protected IP!!! No fake users on this site! This forum does not depend on  guest posting liars to survive!1/2 wit powerless to login and post! LO
Doug
Administrator
Revered Supreme Hero Member
*******
Offline Offline

Posts: 15445



« Reply #8 on: Sunday December 8 2013 22:47:29 AEDT PM »

  
  
Yes by the sounds of it ,i don't know that much about what works where ,i know there are different types of metal detectors ...to me it sounds like golf clubs you use a different detector for different areas ?
If there is a type that is better for soil work i will do some more studying ...as i am petty new to all this.

If you want a detector that will work over soils with mineralization then you are talking about something with much more complicated circuits because you need a method to cancel the effects of ground minerals.
doug smile
Here is something on ground balancing or ground compensation
  
doug smile
Logged

All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin The QED contains NO patented or protected IP!!! No fake users on this site! This forum does not depend on  guest posting liars to survive!1/2 wit powerless to login and post! LO
Doug
Administrator
Revered Supreme Hero Member
*******
Offline Offline

Posts: 15445



« Reply #9 on: Sunday December 8 2013 22:54:38 AEDT PM »

Building a DIY ground balancing metal detector I personally think is well beyond the capabilities of the average person.
just my thoughts,
doug smile
Logged

All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin The QED contains NO patented or protected IP!!! No fake users on this site! This forum does not depend on  guest posting liars to survive!1/2 wit powerless to login and post! LO
harry dalek
Newbie

Offline Offline

Posts: 88


« Reply #10 on: Monday December 9 2013 16:13:22 AEDT PM »

Hi Doug thanks for the advice there ....i love to buy one but stuck  with the cheapo home made detector i suppose it will have an effect on depth and  get many false signals.

To adjust or  manually adjust the ground balance of a metal detector i am still trying to find what this does to  in a circuit of a metal detector i can't say it could not be done as what is it controlling in circuit  that lets it be controlled....

I need an example to look at i am not to bad at electronics ....my last hobby was NBTV mechanical television i invented a mechanical slow scan television system that used a rotating tin painted in glow paint i used a rotating mirror with uv laser to make a mechanical  television screen  like a mechanical cathode ray tube ...
  
Logged
Doug
Administrator
Revered Supreme Hero Member
*******
Offline Offline

Posts: 15445



« Reply #11 on: Monday December 9 2013 16:47:00 AEDT PM »

These links will explain the  more about how GB is achieved in the Frequency  Domain (VLF) and the Time  Domain (pulse induction)
  
  
  
  
  
doug smile
Logged

All posts on this forum are the personal views of the author and should  not necessarily be  interpreted as those of Admin The QED contains NO patented or protected IP!!! No fake users on this site! This forum does not depend on  guest posting liars to survive!1/2 wit powerless to login and post! LO
greylourie
invited members
Hero Member
****
Online Online

Posts: 516


« Reply #12 on: Monday December 9 2013 20:24:36 AEDT PM »

  
Hi Doug thanks for the advice there ....i love to buy one but stuck  with the cheapo home made detector i suppose it will have an effect on depth and  get many false signals.

To adjust or  manually adjust the ground balance of a metal detector i am still trying to find what this does to  in a circuit of a metal detector i can't say it could not be done as what is it controlling in circuit  that lets it be controlled....

I need an example to look at i am not to bad at electronics ....my last hobby was NBTV mechanical television i invented a mechanical slow scan television system that used a rotating tin painted in glow paint i used a rotating mirror with uv laser to make a mechanical  television screen  like a mechanical cathode ray tube ...
  


Hi Harry

That creation of yours is brilliant !

Doug has given you some good leads to read up. I think if you looked at the elements of schematics like the Hammerhead, Goldscan4, QED and some others that you will see a pattern of what makes up a good metal detector. They all contain very similar elements. Have a look at posts here and on Geotech for details of the filters and bandwidth parameters required for the key sections for pulse induction type machines.

grey.
Logged
harry dalek
Newbie

Offline Offline

Posts: 88


« Reply #13 on: Monday December 9 2013 20:27:33 AEDT PM »

Thanks for the links Doug i will do a bit of studying !

I really like how this guy has made the coil form from wood ...i think it might be the closest way i could make that wire cage look for the coil  i think i would perhaps paint or dip it in resin for water proofing.

  
Logged
harry dalek
Newbie

Offline Offline

Posts: 88


« Reply #14 on: Monday December 9 2013 20:52:24 AEDT PM »

Hi greylourie

Thanks for your advice too ! i am just looking at the hammerhead circuit at the moment ...thanks to both you guys for pointing me in the right direction...just looking at those what i have in my junk box .

As with my SSTV project if you look how it started it looked very little how it ended up when i got it working took a long time a lot of trial and error..
  
BTW need to reg to see photos videos like most forums .

But back to this i will look at the other metal detectors i always take on good advice ! Thank you for that !
Logged
OZDigger
Newbie

Offline Offline

Posts: 2


« Reply #15 on: Monday December 9 2013 21:02:57 AEDT PM »

The Mirage PI at <    > reads as an interesting adaption of the Hammerhead
Logged
greylourie
invited members
Hero Member
****
Online Online

Posts: 516


« Reply #16 on: Monday December 9 2013 21:57:09 AEDT PM »

  
The Mirage PI at <    > reads as an interesting adaption of the Hammerhead

Unfortunately the guy who builds the Mirage has not posted schematics showing the final version. There have been some modifications to the Hammerhead and schematic posted by the Mirage originator (Smitty on Findmall forum) but that is not the final cut. I do think an Australian hobbyist got one of the Mirage boards. One of the key improvements, is rearrangement of the gain stages or addition of a split preamp....

There is a some good info on mods for the Hammerhead over on Geotech. JLKing and a few others have documented their efforts there.
Logged
greylourie
invited members
Hero Member
****
Online Online

Posts: 516


« Reply #17 on: Monday December 9 2013 22:04:19 AEDT PM »

Hi Harry.


There is another approach that you might like to look at. Go have a look/see of the Pikini metal detector.

  

grey.
Logged
harry dalek
Newbie

Offline Offline

Posts: 88


« Reply #18 on: Monday December 9 2013 23:33:57 AEDT PM »

Thanks guys I have been studying hammerhead circuit version 1 as i have just about all the parts to that one ..only problem is the 7660 voltage converter .
I see jaycar has a voltage converter 34063 but i don't think it uses and external clock  so that power supply needs looking at for a start .
i suppose i could do away with the voltage converter just using 2 batteries and the regulators.
Logged
OZDigger
Newbie

Offline Offline

Posts: 2


« Reply #19 on: Tuesday December 10 2013 15:22:00 AEDT PM »

The book;

Inside the METAL DETECTOR

ISBN 978-0-9858342-0-3
Publication date: September 2012
286 pages

is very informative and contains construction information on a range of different types of detectors. Ready made PCBs are available for some of these projects. The book is available from Geotech and I have seen it advertised in Australia.
Logged
Pages: [1] 2 3 4 5 6 7 8 Go Up Print 
australian electronic gold prospecting forum.com  |  DIY forum  |  DIY forum  |  Topic: My DIY metal detector project « previous next »
Jump to:  


Login with username, password and session length

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2006-2009, Simple Machines
Simple Audio Video Embedder

BisdakworldClassic design by JV PACO-IN
Valid XHTML 1.0! Valid CSS!