MD-5008 PCB

[ma330]

tank you metaldetector107 dear.
only insert value part list ??????ok?
tank you

[kt315]

draft-on-stage schematic.

[Geo]

draft-on-stage schematic.

Hi KT.
The attached schematic is from MD5002, not from MD-5008

[kt315]

Hi KT.
The attached schematic is from MD5002, not from MD-5008

SORRY GEO but seems you absoliutely do not know Chinese people (this is why you are so happy there!). this is modern technology of Great Chinese Dragon. you see real MD-5008 and they uses ONE PCB in ALL MODELS - 5002, 5006, 5008, 5012 etc etc. there may be some modifications... maybe... you have seen some letters on the PCB and thinking - yeeah, it is MD-5002... clear it is md-5002... kt315 is idiotic...
DO NOT BELIEVE all that chinese people write anywhere you can mistake, but china people is NOT mistaking never more and anywhere! simply copy that they had copied... go a way they following... search their market strategy... copy their strategy... then MAYBE you will be on one step ahead... MAYBE.....

[Geo]

Hi KT315
If you will look at pcb that metaldetector107 attached here, you will see that only the main pcb has 12 IC's, not 6 IC's who has the 5002.
Now if there are two versions of MD5008, then ..... i don't know.

Regards

[kt315]

I see this detector is built on u-controller. pretty strange for clear analog MD-5008 schematic... I considered before the unique post... amazing discovery for me now that MD-5008 is another one...

[Aiko]

I have MD 5008. In air mode in static position this detector is very sensitive – 1 euro coin, far then 35 cm. Also is sensitive to very small objects. But when it is moved over the ground it is very unstable. It can not be balanced over the ground. I think that the only way to use this is to put the coil neat to the ground (2-5cm) ant to push several times the reset button with a threshold and ground balance pots on zero. Then the detector works, but the coil must be keeping near to the ground. Anyway, this detector is a bad lay to spend some money. But who knows – may be in other hands this MD will be not so bad.

[Max]

Uses 4060 and OP07 stuff... to me seems original design... maybe derived from other stuff but not totally cloned I think.

I think, also, the ground problem is due to coil mostly.

Kind regards,
Max

[kt315]

maybe slightly seems wild for you now... it is a mechanical type coil tuning for MD-5008. kinda some coil balance... I do not know as it is NOT my invention a buddy says 'i tune a coil on maximum sensitivity. it is working good'.

I present the idea...

[Max]

maybe slightly seems wild for you now... it is a mechanical type coil tuning for MD-5008. kinda some coil balance... I do not know as it is NOT my invention a buddy says 'i tune a coil on maximum sensitivity. it is working good'.

I present the idea...

Hi,
yes I see... but I've made already! It's in some mine LRL implementations... at coils... (btw also that LRL stuff don't work, of course)

I used nylon screws that found in an hardware store that sell boat stuff... so many inox and plastic screws and fixing there... these are good places where to find them.

Even more easy... some bath stuff uses that too... for jar covers and the like... but other stuff too... same reason... lot of water around and simple e.g. zinc/iron stuff don't last enough... make rust etc.

The idea is interesting applied to existing coil...

Clever ! I like it!

Kind regards,
Max

[simonbaker]

Hi,
yes I see... but I've made already! It's in some mine LRL implementations... at coils... (btw also that LRL stuff don't work, of course)

I used nylon screws that found in an hardware store that sell boat stuff... so many inox and plastic screws and fixing there... these are good places where to find them.

Even more easy... some bath stuff uses that too... for jar covers and the like... but other stuff too... same reason... lot of water around and simple e.g. zinc/iron stuff don't last enough... make rust etc.

The idea is interesting applied to existing coil...

Clever ! I like it!

Kind regards,
Max

What is clever? What do think it is doing, how connected?

Regards,

-SB

[Max]

What is clever? What do think it is doing, how connected?

Regards,

-SB

Hi,
it's mechanical stuff....

if you e.g. change/modify alignment of coils (or even position of shield in some cases) you can tune coil to work better... I mean get lower nulling or right phase.

In this case I'm not sure... but seems to me this stuff apply a controlled deformation on coil housing that's enough to maybe get better performances.

The idea is not wrong... if you assume coils are not directly accessible cause there's potting on them... a good alternative could be a slight deformation on housing... small but enough to reach scope of better performace.

Of course... that means the coils are not perfectly rigid stuff... e.g. the potting compound is not totally rigid epoxy thing... ot that the shield in housing can follow a little deformation if applied...

The idea is much like adding extra stuff like tiny foil strips to adjust after potting... or even a metallic washer there...

The screw thing let me think the guy who used that stuff found he can screw the thing untill get the desired behaviour then leave it alone.

That's similar to old MDs... which used fixing screws for coils nulling stuff... you null then screws fix correct position... then can add some e.g. epoxy/superglue on them to prevent any further movement.

Kind regards,
Max

[kt315]

only got this hi-res photo of the coil inside... enjoy

http://i37.tinypic.com/207ufir.jpg

[simonbaker]

only got this hi-res photo of the coil inside... enjoy

http://i37.tinypic.com/207ufir.jpg

fantastic -- thanks.

Maybe adjustment screw compresses small coil in series with bucking coil???? What is it?

-SB

[kt315]

do a present yourself on X-mas!

http://cgi.ebay.com/METAL-DETECTOR-M...item35ae8bdd3f


METALDETECTOR Metalldetektor Metallsuchgerät

Die Metalldetektorplatine stammt aus einem unbenutzten
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This complete but untested circuit board comes high performance metal detector with an
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Perfected discriminator technique (searching for precious metal) with infinitely adjustable metal differentiation prevents futile incorrect digging, because the display of undesired metals (e.g. scrap iron, tin foil) can be precluded. The metal differentiation takes place optically and acoustically via an integrated loudspeaker and in the large, colour marked display. The signal tone volume is infinitely variable.

Original Item Description


Extreme detection depths up to 2.5 metres for large objects and up to 35cm for coins!

Adjustable sensitivity depending on the search purpose and target.

Optimum, manually adjustable basic setting to ground conditions and sub-terrain! Detection possible even in difficult soils containing minerals.

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Exact pinpointing of location and depth.