Help to design a PCB for my PI design!

[1843]

To Late! Ive already etched one,the new copper layout.drilling it now.
If it fails ,Well I suppose You told me So!Thanks!

That's OK for testing...!

[Rov]

To Late! Ive already etched one,the new copper layout.drilling it now.
If it fails ,Well I suppose You told me So!Thanks!

[Qiaozhi]

edited copper pcb

http://www.savefile.com/files/2061183

regards
night...

Unfortunately this revised layout (where the copper pour has been removed) is not suitable, as it does not use a star topology for the ground.

The original layout has signal tracks of 15 thou, power tracks of 50 thou, and track spacing of 10 thou. This should be within the capabilities of most amateur home constructors.

[Rov]

Download the new pcb,copper side.Now that looks better!Thanks! much Appreciate this.
Better Lazer Print it an check the sizing,an iron on some copper for a backup.Looks easier to hand fill in if any track breaks before etching.Very Good.

[night]

edited copper pcb this amateur home constructors

http://www.savefile.com/files/2061183

regards
night...

[Rov]

Hi 1843,thanks for that info above,will keep it in mind.
Of the 2 pcb Ive etched ,ive chosen the best to drill an a few corrupt,poor tracks will just manually jump on the board with wire carefully.an then Proof all tracks thoughly under a X5 Mag.lense. I have all the components on hand an an assortment of coils to try.Then the programming of the Atmel Chip?I have a few of these ,but with the micro its good that you can reprogram them multiple times ,unless you make the mistake of Lock the code .
I will persist! Thanks.

[1843]

Hi Rov,
You're right....I missed a pcb too. Some tracks are thin and that's because of the ground plan. You may want to design a pcb using star topology methode rather than ground plane.
The new schematic below indicates different grounds for that job:


And also the pin Sync is connected to Q6. By this way, the PB2 can be implemented to generate a frequency twice the PB1's, so the frequency of DC converter will be the same with the detector.

Regards,
1843

[Rov]

Ok,2 failed pcbs,printed an etched,no good wasting $$expensive copper here!
the copper circuit diagram does not lend itself very suitable for home,pcb printing an etching,too many very fine copper tracks for my liking.plenty of unused copper on pcb,track size should have been expanded to make wider,easier tracks to print an etch without breaks an hand fill in?
Start Again!may have to dump this original design for artwork into another software track layout program an edit to suit,better track widths.Placement for components seems ok though!

[okantex]

Just wonder response of this design to
1. any coin or ring by approximately 20cm (diameter) mono-coil
2. coke or beer can by 40-60 cm (diameter ) mono-coil


regards

[Fred]

Probably because there is many talkers and no builder...

[okantex]

why there is no result of constructions?

could nobody succeed it yet?is something wrong with this projects.

why there is no video ,or pictures form working stuffs.or any test results?

regards
Okantex

[1843]

Adjusting

R12: With a coil connected, temporary short the Base of Q9 to 0V. By adjusting R12 you should have a voltage of about 200mV at the pin6 of U7.

And you also need to open R28, Otherwise the DC converter will stop pumping. Of course this procedure is needed for those who don't have an oscilloscope.

It's convenient by an oscilloscope:


Best regards,
1843

[okantex]

Dear ,
I am not interested in coin hunting , beach hunting .

[1843]

what abuot coin test?? can you try few metals and share results with us.

Why don't you build one to see the results by yourself?
It's very simple, cheap, easy...

may be a video presentation?

Are you doubtful? If so, Why? Do the risk to build this PI!

[1843]

Hi Okan,
PI-111 intently is designed for gold hunting. As I remember the detection depth for a hammer was the same for a gold ring!
This PI can detect a 1g gold ring at 8" using a 3" coil. I haven't tried larger coils...