Whites Surf PI schematic

[seadoggy]

i dont test wtih multimeter
i just tune it with scope i put the test point on the coil connect to pcb and i try tune the 5k pot now the sound has gone

my all pots working fine,just sound is low,and no beeeping whit out coil,when hook up coil beep just once

[paku]

now i test with multimeter my voltage on pcb is +06.5 -06.5

[seadoggy]

now i test with multimeter my voltage on pcb is +06.5 -06.5

how much in coil??

[paku]

i dont no about that
i must make new coil first to make test its work or not

[paku]

how much in coil??

i got 00.0 at coil no voltage

[paku]

20 round coil and 6 diameter

[seadoggy]

20 round coil and 6 diameter

i think problem is ""coil"",my surf pi can detect now about 20 cmm 50 euro cent,i have in coil 0.56volt

[paku]

lets try make new coil

[ricalbertvig]

I finished my surf pi .... build one euro coin buried at 30 cm, 35 cm air test, 350 ml can of Coke 75 cm, brass 25 cm to 120 cm .. forgive my English ..

[seadoggy]

I finished my surf pi .... build one euro coin buried at 30 cm, 35 cm air test, 350 ml can of Coke 75 cm, brass 25 cm to 120 cm .. forgive my English ..

what schematic(PCB) long board or??

[andva]

Hy guys!

I see a lot of people built this Surf detector. Is this detector designed only for beach work on sands? Or it is able to work in a forest or field?
I have built my Surf PI, but i have problems, because my one is without a shield. It doesn't want to work when the soil is wet in the forest, it gives false signals all the time. In dry circumstances it works quite well.
I tried to shield it with aluminium foil but the coil detects the shielding material. Maybe the problem is the too thick alu foil, although it is the thinnest I can get.
Has anyone succeeded to shield the coil? What material do you use? Is the shielded machine working over wet soil or is it only good for beach use?

Thank you for your help.

[kt315]

aluminium foil like the shield is nonsense in PI coil. do not accept those suggestions to use a foil you write around in the forum, because lunatics do their ordinary work.
use graphite aerozol.

[andva]

So do you think any metallic material used as a shield is a wrong choice for PI machines? A graphite shielded coil works well on wet soil? Is graphite spray replaceable with carbon fibre?
Thank you.

[kt315]

for example you can open Carl's article on Hammerhead and you will see - no the foil but a DUCT TAPE. metallized film

There are a number of ways to shield coils, including foil, wire wrap, metal- lic tape, and conductive spray coatings. A simple method is to wrap the coil with aluminum duct tape, the kind eas- ily found at the local home improvement center. This is the tape that is true aluminum, not the silvery metallic-looking fabric duct tape. Stan- dard duct tape is slightly conductive, but not enough for shielding.

[ricalbertvig]

The pcb I made it I, Using wizard