PICKINI - an easy to build PI detector

[Dabbo]

Goodmorning everyone. I mounted the second pickini for my brother and I found some problems. All sounds are ok. but he does not feel the metals. I'm using a surf pi 1.2 coil with 3.4 ohms of resistance. it's too much? Thanks a lot to everyone. greetings dabbo

[BC547]

Check port #61 in this thread

http://www.geotech1.com/forums/showthread.php?20084-PICKINI-an-easy-to-build-PI-detector/page3

to verify the DC voltages on all pins.

If you suspect the coil: swap it with the first one you built.

Success!

- Bernard

[Dabbo]

thanks a lot. Today I will try to measure the pins .

[Dabbo]

[Dabbo]

[Dabbo]

everything seems ok but the current on pins 8/9 does not change with metals .

[Dabbo]

I solved the problem !! I replaced the resistor 470 E. now works !!!!! thanks for the help Bernard !!

[Dabbo]

[Dabbo]

good morning to all, I can connect the pickini v2 to a 24-volt battery pack? or the voltage is too high? thanks regards dabbo

[BC547]

Some rough calculations:
From the technical specs: http://users.telenet.be/willaert/MD/...technical.html
Current = 135 mA.
24V in and 12V out: 12V drop x 0.135 = 1.62W dissipation in the 12V regulator!
From the datasheet: no heatsink and 25 C ambient: max 3W dissipation.
In theory, this might work. Attach a small heat sink when the regulator gets too hot.




Best regards,
- Bernard

[Dabbo]

thanks a lot Bernard. i really like the pickini metal detector. Easy to mount and very performant. Thank you for your work. In the next week I'll start working on the pickini V3 project. Best regards dabbo

[6666]

Hi Dabbo, I have been thinking about buying a smart phone to try your frequency counter idea, could you please show on the schematic of the pickini exactly where you connect the smartphone thanks.

[Dabbo]

Good morning to all, i connect my smartphone to Pin 8-9 of pic . I build a probe to divide the Voltage. Best regards dabbo

[Dabbo]

https://youtu.be/xL4tHMMv7-U

[6666]

Thanks Dabbo very interesting, there are some cheap smart phones for about AUS $100 could be worth a try.
My multi meter has a freq counter could try that to.