northwest My DIY metal detector project
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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 »
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Author Topic: My DIY metal detector project  (Read 4225 times)
1Halfgram4three
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« Reply #20 on: Tuesday December 10 2013 17:47:23 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 .

I Love that photo,  smile you must of got some fun and enjoyment from being able to make/use something that others would of never thought of, great work and keep thinking outside the box, this is how people can really make something new never before seen.  good luck
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harry dalek
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« Reply #21 on: Tuesday December 10 2013 17:53:23 AEDT PM »

Thanks ozdigger
That book sounds good i might hint to the family might get it for x mas .
I think The hammerhead circuit looks good to me ...i am sure i will make others but for a start having a good look at it it seems well with in what i can solder together .

The only minor thing i will change is the power supply part for now and i will just use a Universal Pre-Punched Experimenters Board its how i make circuits , i can fit all that in my case ...it has 2 slots for circuit boards just have to cut them to size ...

I'll post how i go with it .
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harry dalek
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« Reply #22 on: Tuesday December 10 2013 18:42:44 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 .

I Love that photo,  smile you must of got some fun and enjoyment from being able to make/use something that others would of never thought of, great work and keep thinking outside the box, this is how people can really make something new never before seen.  good luck

Oh that was not my idea but i am going to pinch it! The crutches idea i hope is ok as it is made from aluminium  my only thing is how much does it effect the detector ....if by the sounds of it its fine i will go with it ...once i find one i hope tomorrow btw....if not the older type are every where what i like about the older type design is the adjustable part of the crutch you can tack 2 together with a aluminium spacer or tack 3 together and you can pull it to bits and put it in a bag !   saves you trying to take something the size of a whipper snipper on holiday !
My original idea was to use those take apart fishing rods they are more than strong enough but again i like
the crutches idea better.
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harry dalek
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« Reply #23 on: Wednesday December 11 2013 16:49:22 AEDT PM »

Cut the circuit boards today so they side in the case holders also got the ic's i didn't have .
Seems most of the circuits for MDs use cmos ics .

Had not luck on finding the crutches today 3 reuse shops only have the older type .

So i may as well start with the power supply i have to change it a bit as that was one ic i couldn't buy local .
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« Reply #24 on: Thursday December 12 2013 12:04:22 AEDT PM »

OK working out the power supply i will be using MC34063  it can either covert the voltage up or down and either have a + or - output it works at a higher frequency than the hammerheads ic which its ??ck when used does 10khz this ones up to 100 khz and has a wider voltage range if it were not the fact they are 5 dollars each i would of got 3 and done away with the 7905 regulators as well .

I think the reason the voltage converter is used in the hammerhead is it is more efficient than a regulator which will do the same but waste the unwanted voltage a heat...sort of strange also using 7905 regulators .

Could just use say a lm317 but again this switch mode ic  is more efficient so i suppose it helps in battery life .
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harry dalek
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« Reply #25 on: Thursday December 12 2013 12:06:13 AEDT PM »

heres the 9volt version
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harry dalek
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« Reply #26 on: Friday December 13 2013 12:38:06 AEDT PM »

Today  the redesign of the hammerhead metal detector power supply is finished and works fine heres a quick post ...
I hope to fit the circuits on the two boards that will side in the long case i can fit batteries in there as well seems enough room.

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« Reply #27 on: Friday December 13 2013 12:42:33 AEDT PM »

Heres the case and how the boards fit....the controls and rf out are at either end which in this photo the ends are removed to work on it .
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« Reply #28 on: Friday December 13 2013 12:44:53 AEDT PM »

  
Heres the case and how the boards fit....the controls and rf out are at either end which in this photo the ends are removed to work on it .
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« Reply #29 on: Friday December 13 2013 12:52:50 AEDT PM »

OH made a mistake uploading the 556 picture ...i am talking about the photo below it ...
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« Reply #30 on: Sunday December 15 2013 01:48:32 AEDT AM »

  
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.

As on eBay too.
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harry dalek
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« Reply #31 on: Sunday December 15 2013 13:08:55 AEDT PM »

Hi wm6 i sort of have to start somewhere so i have gone with some advice and picked the Hammerhead or one of its many versions.

The PCB you can buy is an easy way to go but i can follow schematics and its really no problem to just do the wiring as well...i think you learn more than just placing parts in a place and soldering ...its a lot quicker but to me the difference driving a manual car to a automatic ones a true car the other a go cart .
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« Reply #32 on: Sunday December 15 2013 14:11:01 AEDT PM »

This is where i am up to at the moment ..those that know the schematic thats the power supply ..clock ic5 Q1Q2Q3, have to see how i go with the next board for space so i will be packing it in and making it pretty flat .
Might have to do a 3rd board see how i go .
This is also my wiring i just use power cable copper wire strands .
OH BTW all the resistors and most of the parts apart from the ics and transys are scrapped from old tvs vcrs and such .
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« Reply #33 on: Sunday December 15 2013 14:12:38 AEDT PM »

The wiring
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« Reply #34 on: Sunday December 15 2013 14:48:30 AEDT PM »

Hi Harry,

Are you going to make a ground balance system for yours, I bought the board yonks ago but had trouble buyin the bits for it as I'm electronicly dyslexic

If it said it wanted a triple input power terminal I look at the book and see half a dozen and order what I think is right and end up getting one that is too big or too small

So, I will watch but you might lose me somewhere along the line

Cheers,

Ron
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harry dalek
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« Reply #35 on: Sunday December 15 2013 15:35:22 AEDT PM »

Hi Harry,

Hi Ron

Are you going to make a ground balance system for yours

No i don't understand this enough yet.


, I bought the board yonks ago but had trouble buyin the bits for it as I'm electronicly dyslexic

What parts are you missing ? i only had trouble with the power supply chip the power supply part of it is a night mare really you can make a lot of mistakes doing the board my way unless you under stand the power supply ....so i have redesigned the power supply just with what i had handy and a different chip for the 5volt positive .

If it said it wanted a triple input power terminal I look at the book and see half a dozen and order what I think is right and end up getting one that is too big or too small

Thats the trouble with circuit boards you need the right fitting size my way i can just use what i can find ...don't give up just explain what you have done ..finish soldering what you have and work on what you don't might be able to replace whats missing with another part or idea .

So, I will watch but you might lose me somewhere along the line

Cheers,

Ron

No worries ,i just follow the schematic and try and fit the next part of the circuit as i go if i think i have enough room ..then i test as i go as i did so far.....made the power supply tested it if it worked and i made no mistakes ...then i did the same with he 555 timer clock and so on ...doing it my way you need to do that as its easy to make a mistake and you would be asking for a non working circuit to finish it all and switch it on ...might hope for the best but i bet there would be a mistake or two to fault find ! so i take it easy and test as i go .

I have also worked out the arm for the thing using what i had found a old type crutch cutting one side off and using one side and the adjustable bottom part looks good ...i might tack on another part make it a bit longer have to see when i add that circuit case .
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« Reply #36 on: Sunday December 15 2013 19:22:44 AEDT PM »

Finished my free time work on the circuit today heres apart from the power supply the circuit made so far on the board shown.
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harry dalek
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« Reply #37 on: Sunday December 15 2013 19:25:27 AEDT PM »

Heres the circuit
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« Reply #38 on: Sunday December 15 2013 19:28:07 AEDT PM »

another view
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« Reply #39 on: Sunday December 15 2013 21:47:45 AEDT PM »

hi Harry,

Heres where I'm up to
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