IF YOU HAVE MAKE , TRY THIS .

[sisco]

Hi all

first tell , this is only for amateur friends.

you can see original detail in this address minipuls3)

http://www.pulsdetektor.de/projekte/projektindex.html

I can help you for making this metaldetector step by step from first step

to last step.

I make this and test . my minipuls3 can detect 10*10 cm iron plate at

85 cm . (by 35 cm dia coil 2.2 ohm)

MINIPULS3PART1.ZIP : schematic,partlist,PCB layout,HEX file for ATmega8

MINIPULS3PART2.ZIP : photos for better understand.

SOFTWARE.ZIP : software for programming minipuls3

HARDWARE.ZIP : schematic,partlist,PCB layout ISP programmer

CHARGER.ZIP : schematic,partlist,PCB layout battery charger

By these files you can make easily this metaldetector and can use this . (all

of these test by me)

In past i make hammerhead,deltapuls,xr71,coinhawk,... but tell you , this

metaldetector very better of all these . you can test .

thank you NormanB(pulsdetektor forum) and 1843 for help.

[Geo]

Hi Sisco.
What abour R30 ????

[sisco]

Hi Geo

Excusme , I forget .

R30 , In original schematic used 560K but I use 1M for my minipuls3 .

You can test other resistors for R6 and R30 because these resistors Determinative your preamplifier gain .

in original schematic preamplifier gain was 560000 / 560 =1000 but in my minipuls3 preamplifier gain is 1000000 / 560 = 1785 .

[Max]

Hi all

first tell , this is only for amateur friends.

you can see original detail in this address minipuls3)

http://www.pulsdetektor.de/projekte/projektindex.html

I can help you for making this metaldetector step by step from first step

to last step.

I make this and test . my minipuls3 can detect 10*10 cm iron plate at

85 cm . (by 35 cm dia coil 2.2 ohm)

MINIPULS3PART1.ZIP : schematic,partlist,PCB layout,HEX file for ATmega8

MINIPULS3PART2.ZIP : photos for better understand.

SOFTWARE.ZIP : software for programming minipuls3

HARDWARE.ZIP : schematic,partlist,PCB layout ISP programmer

CHARGER.ZIP : schematic,partlist,PCB layout battery charger

By these files you can make easily this metaldetector and can use this . (all

of these test by me)

In past i make hammerhead,deltapuls,xr71,coinhawk,... but tell you , this

metaldetector very better of all these . you can test .

thank you NormanB(pulsdetektor forum) and 1843 for help.

Hi Sisco,
"I make this and test . my minipuls3 can detect 10*10 cm iron plate at

85 cm . (by 35 cm dia coil 2.2 ohm)"

Seems really good ! Nice detector.

I can't remember now but I think I get similar results on Goldscan4, but maybe I'm wrong... I just use 20cm coil with GS4.

Anyway, nice to see there are good projects to play with on Pulsdetektor site.

What about bricks, pottery, ceramics ? Are they a problem when you use on the testfield ?

Best regards,
Max

[1843]

Hi Max,

It is not sensitive to pottery and ceramics (also ground effect).
For me, only DP detects pottery!!!
I don't like pulsdetektor PIs... they burns high energy! Also their designer doesn't put
the source codes of them at the site. ( Maybe he thinks his PIs are Lorenz!!! )

Have fun,
1843

[Max]

Hi Max,

It is not sensitive to pottery and ceramics (also ground effect).
For me, only DP detects pottery!!!
I don't like pulsdetektor PIs... they burns high energy! Also their designer doesn't put
the source codes of them at the site. ( Maybe he thinks his PIs are Lorenz!!! )

Have fun,
1843

Hi 1843,
Goldscan4 detects pottery too much well... so it's truly impossible to use it in a site where there are ceramics, etc.

GS4 is too really expensive on the energy side... found good just for beach!

Also DP suffers same problem. I've found somehow less effect on XR-71 but don't sure why (frequency is about the same of GS4), maybe timings.

The more the sens. the more things go worse with them.
But I know that Lorentz suffer too!!! That's the problem!

I think that pottery detection is one of the worst things a detector could suffer from, as always just my thought.

Best regards,
Max

[sisco]

Hi MAX & 1843

See first line : " This is only for amateur friends ".

I dont think this is best . I try in this project learn to amateur friends how

must make PCB .

about programmer : you need this for any metaldetector used

microcontroller.

about charger : in all of metaldetector you must use rechargeable

battery and need charger . this charger can charge your batterys from 1.2

to 24 volts and 50mAh to max 15Ah battery .

and for easy schematic , 85cm not bad.

[sisco]

Really , why I must try to find pottery,bricks,ceramics,..

I live in historic city . my city build for first time from 300 ~ 400 BC and I

can find these stuff without metaldetector because these very lots

around us I only have find metallic stuff .

my city in thousands years a go to now was city of Commerce and artisan

(iron , gold ,silver,bronz,...) because near the desert and can't do other

work like Agriculture , ranch , ...

so I only have find metallic stuff and need good metaldetector not

potterydetector or ...

If goldscan4 can good work thank you if send me PCB layout (not like GS-4

pdf file) I have PCB layout without SMD parts.

very thank

[Max]

Really , why I must try to find pottery,bricks,ceramics,..

I live in historic city . my city build for first time from 300 ~ 400 BC and I

can find these stuff without metaldetector because these very lots

around us I only have find metallic stuff .

my city in thousands years a go to now was city of Commerce and artisan

(iron , gold ,silver,bronz,...) because near the desert and can't do other

work like Agriculture , ranch , ...

so I only have find metallic stuff and need good metaldetector not

potterydetector or ...

If goldscan4 can good work thank you if send me PCB layout (not like GS-4

pdf file) I have PCB layout without SMD parts.

very thank

Hi Sisco,
me too don't search pottery or bricks
what I was trying to say is that you have lot of false signals from ceramics, pottery, bricks... so cannot say if is metal or ceramics buried untill you dig stuff!
That's a huge problem find metal if your detector signals bricks and fragments and you are in places like in the pictures ! or not ?

So, my advice is think twice before making for real GS4, cause you'll have all such problems then on the field.

A good solution could be using a larger coil (for larger and deeper objects) but keep it higher (30+ cm) than you use with e.g. an 8'' round.

If I gave up on this there will be a reason ???

Best regards,
Max

[sisco]

hey Max I dont tell I live in these places .theses places near to me and I

can find hundreds location like these for searching .

see these pictures , if my metaldetector can detect pottery ,bricks ,.. really I

can't find anything.

Hurry , I wait for Goldscan4 ...................................

[Max]

hey Max I dont tell I live in these places .theses places near to me and I

can find hundreds location like these for searching .

see these pictures , if my metaldetector can detect pottery ,bricks ,.. really I

can't find anything.

Hurry , I wait for Goldscan4 ...................................

Hi Sisco,
I've just said :

"That's a huge problem find metal if your detector signals bricks and fragments and you are in places like in the pictures ! or not ?"

meant "when/if you go to that places or similar, with bricks around etc"
not that you live there.

But I think that wasn't good idea post that pictures here... but not for me!
I'm not interested in these, or your location... but OTHER people maybe yes, so follow my advice: don't post that things.

I'm sure you know what I mean.

Anyway, "Hurry , I wait for Goldscan4 ..................................." ???

Just explained in another thread... all the story.

Best regards,
Max

[1843]

Try this!

Hi SISCO,

Try to short the 1mH/2A coil... Let us know if its detection improves or not.

Best regards

[sisco]

OK , but i don't think diffrence.

[sisco]

This is my new version minipuls-3.

I use in this , two 12V/1.2Ah battery and two V-MOSFET (with little change in peramplifier)

and detect with small coil (15cm) , 50cm * 50cm metal plate at 150 cm .

you can with a little thinking and good idea make this metaldetector better

because this is very simple .

if you have good idea I enjoy for listen and testing.

[Geo]

Hi Sisco.
If you detect with small coil (15cm) , 50cm * 50cm metal plate at 150 cm then i can tell only one..."Perfect ".