PICKINI V4 - an easy to build, self adjusting PI detector

[F117]

Cant open the video

I tried with Chromium and Firefox. Both worked fine.
It is an .ogg video file.

[F117]

Added a .mov file = H264, next to the ogg format.
I assume that one of the 2 should work in your browser.

[eclipse]

http://users.telenet.be/willaert/MD/.../PickiniV4.mov

[ripsdevala]

Nice video bernard, need to buffer it first to play, cant open from mobile device for the ogg. Mov video is downloading here on android, not playing

[Tim]

Video worked fine for me. Volume was Ok too. Thanks very much Bernard. Can you estimate at what distance it can detect that coin on the rock please?
I have been busy, but I am reasonably confident to burn the chip, now understanding jumpers, and thanks to the information from 6666, which I have now had time to digest.

[F117]

Can you estimate at what distance it can detect that coin on the rock please?

A 10 Eurocent coin is harder to detect with a PI detector than a (smaller) 5 cent coin, that is basically copper clad iron.
The 10 ct coin can be detected at 20-25 cm with the 28 cm (11 " ) coil you see in the video. A 5 ct coin ( the iron one ) will give slightly more depth.
The main disadvantage of this coil is that I sometimes end up digging deep holes to retrieve a soda can...

[Tim]

Thanks Bernard. That is OK, but maybe some tweaking is required. Still a great project well worth pursuing,. I will be trying a smaller and lower inductance coil first.

[6666]

The video on reply #108 has no sound, but the video on f117 website works ok

[nick holas]

Hi Bernard how are you?
Very good video,hère we can sée your very good métal détector capacities
Will send you photos,now i m in weekend!!!!! Ouf!!!!
Finishing enclosure ans shaft

[nick holas]

What have you made to hear this loudy sound??
Small amp (lm386,tda2822 maybee???)
Thanks
(Sorry for double post)

[F117]

What have you made to hear this loudy sound??

The sound recording is just the built-in microphone of the camera and a small loudspeaker connected to the headpone jack.
The quality is bad, because you can't hear the 1 Hz idle tick, for instance...

Looking forward to see your creation !

Regards,
- Bernard

[nick holas]

small amp

what do you think about that?
pcb 20x20x5mm
found lm386 smd on micro wave oven pcb and some smd capacitor too ,so i think that it could be adapt for free for pickini.
i made this pcb from web scheme,do you think it is correct?
thanks

[F117]

Nick,

Most headphones have an impedance > 20 ohms.
If you connect them to the Pickini4 PCB, the sound is good / loud. You could decrease the 2 series resistors of 1K ( R16 and R17) in the original schematic, to have an even louder sound.
To me, with the headphones I normally use, the 1K resistor is a tradeoff between going deaf and hearing the beep.
Normally, you would not need an extra amplifier. The beep is digital: beep = 1kHz and dig, or no beep / the 1 Hz idle tick.


Regards,
- Bernard

[ripsdevala]

The part list and pcb on c12 is not same
Please check
Pcb
Part list

[F117]

C12 should be 10 microfarad.
I adapted the parts list here:
http://users.telenet.be/willaert/MD/...ectronics.html

Thanks for pointing this out