Whites Surf PI schematic

[Cudashark]

Accurate and Clear Schematic of the Surfmaster PI Pro

Nice job Cordius,

Hi,

I am looking for clear and accurate schematics for the PI Pro. I have the actual unit and find many coins on the beach but on dives its to awkward.

I'd like to build something more compact for diving.

I live on the Treasure Coast of Florida(USA) and thats me with a silver real. I used a different underwater detector that is not as responsive.

I have looked up the patent; Lahr; William E. (Compton, CA) # 5,414,411 and their is a lot of good information as well as some coil configurations.

I recommend looking it up.

If anybody has the schematics please contact me.

I have the capabilities of making professional pcb's.

PS patent is 12 years old.

Ray

[ApBerg]

Hello Cudashark, and friends

Ok a small pcb is a must for dive stuff, but start thinking from the housing you have ore can make ! ( a pcb is lots easier to make than a good housing for diving !! )

Also the way you like your target signal ! Speaker ore leds ?
Best is sound I think…, leds in clear water and sun in a not to deep dive is not good !
Leds must take your attention all the time, sound lets you more freedom.
Also no headphone , so no wire ! Make the piezo part from the UW housing !

For sound you have to find a good piezo speaker that fits the output audio, ore better make in the circuit a audio output that is adjustable in freq. ( better idée s are welcome ! )

For housing I use pressure pipe to make things waterproof use always good O rings, glue is not the best solution ! The end caps are solid pvc.

With some trail and more error I made some housings for diving look at the photo, this is a detector for our grandson. The long PI print also fits in it .

Best regards.
Ap

[cordius]

Hallo cudashark, you can put a little piezo speaker, remember with a piezo you dont' listen the small but very important variation of sound.
If you put a piezo, remember to riduce R34 value 150 ohm. Good is 47-56 ohm. All tested
Very very important: I build it for hobby and personal electronic experience, my metaldetector have many change at original schematics. Little example the 15uS pulse delay on my electronic, for good response at gold, not original 50uS. My electronic is inspired at original schematic but there are many many changes.

[Cudashark]

Nice Job Ap,

Thanks for the input Cordius. I like that you understand how to change the specs to suit your needs. I do the same with Mahogany Speed Boats.

I have several pairs of underwater headsets. I also have a pair of underwater ear buds.

I currently use the headset when diving and like the way they work.

As much as discriminating for only gold sounds good at first when treasure hunting. While diving, finding artifacts helps pinpoint "hot spots".

Most of the diving is 10 to 20 meters. Waterproofing is fairly simple. Being in the boat building industry I have access to many watertight cases and containers at wholesale.

Ray

[Cudashark]

Cordius,

I've re-read the thread and like the mod's you have made. I am interested in maybe doing some trading with your for some design work.

Can you list for me the mods you have made? Are their components or parts you need from the US.

Please e-mail me at [email protected] if you are interested.

Ray

[gurdal]

[quote=OSTIN;80972]Hi!
I have done PCB for SurfmasterPI in Layout.


hi all

I wonder how this detector separation and depth???

materials ready.I want a good separation and depth.

information you give to me.I thanks in advance

[DIRCEU]

Hi! all

Recently I finished my SURFMASTER APBERG's Version and work very very good.
Results in air:

1 euro coin = 37cm
small gold ring = 28cm
coke can (allum.) = +_ 1 m
(All refers at final audio detection)

I made the coil with 19cm diam. planar shape 1,6 Ohms 20 turns. Don't remember now the wire number I used.

I tested it at a beach and I found 8 USD in coins of my country; also one gold ring, one silver ring and one little silver medall. This during 3 hours of researching.Its very good! like a fishing

[nelson]

Congratulations!

You have done an excellent work.
My surfmaster is working fine, but not so close has the one you made.
I think that my problem is the coil, cause i had checked the pcb and componets twice and everything looks fine to me.
So if you can post the wire size of your coil, will be very helpfull.
Regards
Nelson

Hi! all

Recently I finished my SURFMASTER APBERG's Version and work very very good.
Results in air:

1 euro coin = 37cm
small gold ring = 28cm
coke can (allum.) = +_ 1 m
(All refers at final audio detection)

I made the coil with 19cm diam. planar shape 1,6 Ohms 20 turns. Don't remember now the wire number I used.

I tested it at a beach and I found 8 USD in coins of my country; also one gold ring, one silver ring and one little silver medall. This during 3 hours of researching.Its very good! like a fishing

[DIRCEU]

Congratulations!

You have done an excellent work.
My surfmaster is working fine, but not so close has the one you made.
I think that my problem is the coil, cause i had checked the pcb and componets twice and everything looks fine to me.
So if you can post the wire size of your coil, will be very helpfull.
Regards
Nelson

Many thanks! NELSON

With my first coil was the same thing then went up to reduce the wounds and measure the distance from targets in each reduction. For me 1.6R.
Under this point the mosfet starts to warm much.
Wire diameter is 0,6mm
Inductance is arround of 165uH.
Put a trimpot instead of damper resistor for choose the best value.

regards
Dirceu

[nelson]

Thanks Dirceu.
My surfmaster, have a few things to solve like:
1.- The detector sounds with no metal close, verytime i sweep the coil, normaly to the rigth side.
2.- When i try to adjust the trimmers on pcb, sometimes an oscillating detecting sound comes thru the buzzer, up and down, then i reduce sensitivity until this sound comes just like a hum, but detection range is reduced.
3.- What i notice today is that sound thru the buzzer comes very loud and clear at maximum volume and also i had found that when you low the volume, detection seems to be more sensitive. So may be my problem is with the buzzer and i must change it to a normal speaker or headphones. Any comments on this.
Well, thanks for your coil data. This weekend i will try my surfmaster again.
Kind regards
Nelson

Many thanks! NELSON

With my first coil was the same thing then went up to reduce the wounds and measure the distance from targets in each reduction. For me 1.6R.
Under this point the mosfet starts to warm much.
Wire diameter is 0,6mm
Inductance is arround of 165uH.
Put a trimpot instead of damper resistor for choose the best value.

regards
Dirceu

[DIRCEU]

Thanks Dirceu.
My surfmaster, have a few things to solve like:
1.- The detector sounds with no metal close, verytime i sweep the coil, normaly to the rigth side.
2.- When i try to adjust the trimmers on pcb, sometimes an oscillating detecting sound comes thru the buzzer, up and down, then i reduce sensitivity until this sound comes just like a hum, but detection range is reduced.
3.- What i notice today is that sound thru the buzzer comes very loud and clear at maximum volume and also i had found that when you low the volume, detection seems to be more sensitive. So may be my problem is with the buzzer and i must change it to a normal speaker or headphones. Any comments on this.
Well, thanks for your coil data. This weekend i will try my surfmaster again.
Kind regards
Nelson

Hi! NELSON

1- You need to shield your coil.
See: http://www.geotech1.com/pages/metdet...s/FastCoil.pdf

2-3- Try my coil recipe.

Best Regards
DIRCEU.

[ApBerg]

Hello Dirceu & Nelson

Very good results !! Hope you find lots more good finds!
For speaker you can also tray to use a piezo speaker, it is not so load but if you place it in a headpone (cheap earprotection style) it is also easy to make it waterproof. Look at the way the waterproof detector have made them. If you use a litle audiotrafo (old transsitor radio) the sound for a piezo speaker gets some louder.

Best regards.

Ap

[nelson]

Ok, i ll try your recipe. Do youthink this could be my problem, that cuses my detector to sound everytime i sweet it to the rigth, sometimes to the left, with no metal close?
Many thanks
Nelson

Hi! NELSON

1- You need to shield your coil.
See: http://www.geotech1.com/pages/metdet...s/FastCoil.pdf

2-3- Try my coil recipe.

Best Regards
DIRCEU.

[nelson]

Thanks ApBerg.
By the way, what did you place in your surfmaster, piezo or speaker?
Regards
Nelson

Hello Dirceu & Nelson

Very good results !! Hope you find lots more good finds!
For speaker you can also tray to use a piezo speaker, it is not so load but if you place it in a headpone (cheap earprotection style) it is also easy to make it waterproof. Look at the way the waterproof detector have made them. If you use a litle audiotrafo (old transsitor radio) the sound for a piezo speaker gets some louder.

Best regards.

Ap

[DIRCEU]

Ok, i ll try your recipe. Do youthink this could be my problem, that cuses my detector to sound everytime i sweet it to the rigth, sometimes to the left, with no metal close?
Many thanks
Nelson

Hi! NELSON

Yes I do.
I'm using a very simple magnetic earphone, but I am thinking in add to output the Ivconic's TGSL audio.
Best Regards

DIRCEU