Simplest PI detector possible?

[farafero]

I found this a week ago here, but I can not find anywhere this transistor MJE5742. Can I use someone zmestitel, RF740, RF640 or someone similar?

[farafero]

In IRF 640 irf 740 and resistors R5 what value should be?
http://www.geotech1.com/forums/attac...8&d=1390640621

[gw1964]

is there a circuit board available for this or is it still a work in progress?

[farafero]

http://pics.data.bg/categories/1/%D0...08a46dd/2_silk
Someone will answer me what those things where I remarked?

[6666]

Where is the circuit for that pcb posted so we can have a look ?

[farafero]

http://pics.data.bg/categories/1/%D0...2cfd93b6/2_all
This is the scheme found it here in the back pages

[WM6]

http://pics.data.bg/categories/1/%D0...08a46dd/2_silk
Someone will answer me what those things where I remarked?

Fuse and loudspeaker.

[Waikiki_Sweep]

http://pics.data.bg/categories/1/%D0...2cfd93b6/2_all
This is the scheme found it here in the back pages

HOW TO CONNECT

[farafero]

so TNX !!!

[farafero]

I did it finally. When you get close to the ground reacts constant soil Is this normal? When I tested the soil was wet after rain?

[Waikiki_Sweep]

I did it finally. When you get close to the ground reacts constant soil Is this normal? When I tested the soil was wet after rain?

Just shield the coil.

As one of the ways to shield coils I am using:
- put some insulation layer over the coil (paper tape or polyethylene which is better [less capacitance] than paper tape [epoxy will stick to it])
- strip silver plated multi strands wire and spiral wind it over insulation with step 0.5 - 1 inch.
- you have to make a gap (not to connect ends)
- mix graphite powder with epoxy 1:1 by weight.
- cover all surface except 5-10 mm gap (!!!)
- connect wire to ground (or to power "+" rail if in your schematic coil is connected to "+")

Or you can buy a shielding tape. (synthetic cloth covered by cooper than nickel)
Remember, you have to make a gap.

Do not use aluminum or cooper foil because it acts like a target.

[farafero]

Isolated the coil with tape, one piece fiber Hallows book.plz im waiting 3 cm thick, carved and placed 1 cm coil in the inscription. Smudge with top slikon.


So tryabvyaa to isolate the coil again to shield?

[bernte_one]

hello farafero

can you make pictures and maybe video of your unit? thanks

[Waikiki_Sweep]

If you have a 1-2 millimeters insulation between coil wires and shield it helps to reduce coil to shield capacitance so your coil will discharge faster and let you to find smaller targets or targets which decays faster for example gold.

[farafero]

Here's a video. How Does different coins. How did you react and screaming on the ground (soil)
http://vbox7.com/play:17132621ac