PIM-2 Digital Metal Detector Project

[jap]

Hi sparky
Testing must be out of the house because of the sensitivity - when give this message means that there is metal beside the coil.

Important Note: You can make a test small coil and put any small metal beside him before the start on/off of the project will give the same message.
best time
j.

[sparky]

I did try that outside. The resistance is 2.7 ohms. Does that seem low? 3 turns of 24 gauge wire.
I will go back outside and try another spot in my yard. who knows, maybe I was over some gold bars.

[jap]

Important Note: You can make a test small coil and put any small metal beside him before the start on/off of the project will give the same message.
Read reply#93,#106,#108.
best time
j.

[jap]

Hi sparky
What a test result for a small coil?
As for the large 2m x 2m coil high probability mis Specifications like In the number of tu,---,-----!
best time
j.

[sparky]

My large coil is actually 50cm x 5M. 3 turns with single wire as per PIM2 manufacturer. I did move the coil to another spot in the yard and now I get "connect coil" error. I made the coil with Telephone station wire which I believe is the same as cat5. (24ga, 8 cond. twisted pair)
I will make a 2mx2m square coil tomorrow and test it.

[sparky]

My 12" coil is 2.2ohm and works great.
My 2mx2m coil is 2ohm (3 turns) and working great!

I'm thinking that the PIM2 isn't strong enough or has to be modified to drive the 50cm x 5m coil.

Thanks for all the help.

[6666]

50cm x 5m coil

What are you looking for with that coil ?

[jap]

Hi sparky
Congratulations success
What a results for a 12" coil ,2mx2m coil?
-about 50cm x 5m Excuse me please explain it,I expect results equal to 2mx2m.
best time
j.

[sparky]

Hello 6666. I will be searching for an airplane in a lake. I could never get that coil working but made a 2mx2m coil and stretched it 50cm x 4m. I made a PVC frame and filled it with cement so it would sink. I needed a wider coil to cover more area. It doesn't have to go too deep as an airplane is a large target.
I still can't get a 1mx1m coil to work for some reason.
I'm still testing other coils for depth.

Jap... how warm should R16 2r2/5w resistor be getting? It seems to get hot at times.

[tjmlena]

I have the same problem 2r2/5w seems to get hot, sometimes irf740 . now they are normally.
But now bc517 is a little hot.

System says: connect coil.

I cant find the problem.

[jap]

Hi sparky
Heated resistance R16=2.2/5W depends on the value of the resistance of coil(The less resistance, increase heated R16,FET) because the current drawn from the battery through which to FET=IFR740.
--Instead of R16,,, I advise you using this type of resistors(Photo)
best time
j.

[jap]

Hi tjmlena
In ver 6 when say connect coil,While the coil connected This is normal.
Solution:1-He is very sensitive to things inside the place.
2-Test must coil a small diameter and lifted a sufficient distance to the highest.
-for Heated r16 read previous reply.
best time
j.

[tjmlena]

Thanks Jap.

When power up sometimes need to wait long , be seen CONNECT COIL, until 1st screen.
Changed R5 from 680R to 560R .
Next I will change 2r2 5w, but here I only find AP836-2R2J 35W >> I believe that these wil be ok.

I will test and report

[jap]

Hi tjmlena
AP836-2R2J 35W ....OK
best time
j.

[peterr88]

can anyone send me files to make pcb?
http://www.centplay.com/affiliate/id_139/