Whites ???

[kt315]

pi1000 schematic

[ATTACH]37545[/ATTACH]

this is whites PI-150. industrial. Koala replied right.

[kt315]

try ask on main whites forum too http://forums.whiteselectronics.com/forum.php
thinking they have to know their product.

[ivconic]

Thanks KT315, nice and clear photos!
So it is not PI-1000, at least one doubt more cleared.

[ivconic]

Could there be a clue bottom left "PI15086"

PI 150. In 1986

Just a guess

Pulse Induction detectors are now widely used in the construction industry; the Whites PI-150 is an industrial machine which can detect large objects to 10 feet, using a 12 or 15 inch coil.

Thanks Koala, another interesting lead too!
Must admit that i have never heard about PI 150!
Will look up for details.

[ivconic]

pi1000 schematic

[ATTACH]37545[/ATTACH]

Yes, looking at schematic it becomes obvious that this is not PI-1000.

[Carl-NC]

try ask on main whites forum too http://forums.whiteselectronics.com/forum.php
thinking they have to know their product.

No one at the US factory will know anything about this. You need to contact the UK factory, and I don't think they pay any attention to the White's forum. The best guy to ask is Derek Murray, [email protected].

[ivconic]

No one at the US factory will know anything about this. You need to contact the UK factory, and I don't think they pay any attention to the White's forum. The best guy to ask is Derek Murray, [email protected].

Thanks!
I just wrote him an email.
Looking forward his eventual reply.

[ivconic]

I removed nasty paint from pcb to be sure in some traces and vias.
So, draw is alright now.
Now is time to start analyzing it and pull out some conclusions.
Enjoy!

[WM6]

Excellent work again - PCBoard maestro.

Look like PI IB.

[ivconic]

Redrawing the pcb was easier part.
Now, the rest is much harder.
Without schematic, without clue... almost impossible task.
Reason i am pushing this is because i kind a feel a potential in this, sort of a hunch.
Potential for further improving and playing with.
But without more details i can't do much.
So far it was easy to recognize roughly few chips.
Front end is most probably NE5534.
And there is probably 7660 or LT1054 on the bottom right...
Two 40xx's and the one DIL 16 which confuses me by now.

[ivconic]

Searching widely the Internet for any useful information, no chance!
It's like the most kept secret... damn!
You can't find any useful info on official sites... apart from lot of nonsense advertisements.
And than i stumbled on this video from White's Electronics UK Factory, Inverness, Scotland.
I guess; best way to protect your intellectual property and make it ultimate secret is ... to hire Scotsman to do the job for you (even they are clueless about what they are doing for salary)!
Ooooahahahahahahahahahah!
You can watch this video dozen times from the beginning and still you'll have no clue about nothing!

P.S.
"...Who is your favorite actress!"

[ivconic]

Almost certain about few more details:

[ivconic]

Interesting thing; there is no damping resistor on pcb, there is a serial resistor though !?
Bipolar TX or fet!?


P.S.
It talks like a PI, it walks like a PI, it stinks like a PI... it must be a PI than!??

[Altra]

I think R25 is your damping resistor. A1 and A2 look like the battery connection. B1/B2 the coil.

[ivconic]

I think R25 is your damping resistor. A1 and A2 look like the battery connection. B1/B2 the coil.

A1 and A2 are battery inputs, no doubts at all.
B1/B2 are coil connectors, yes.
R25 is parallel to coil, therefore it is damping resistor.
Have you opened my last .lay file? I noted all those except R25.
I missed to spot R25 because i was pretty focused on (blinded by) R24; its size and role there.
And now when you mentioned it; i am starting to get different idea from what i had previously!
Since R25 is normal size (1/4W) and R25 is approx. 2W and probably more; than next logical conclusion is that this is not high current PI detector at all! Bingo!
Altra you just speed up the process of thinking by pointing on so obvious (and yet "masked" by R24) R25 as damping resistor there! Thanks!
So, R24 is there to limit the current through coil and therefore R25 does not need to be "high-wattage" at all!
Further, logically; current in coil is small. Why? How? PPS? Role?
Somebody earlier mentioned "industrial"....? What exact role?
...
This kind of "investigation" gives me more pleasure than working on something which is fully documented!
Splendid guessing game!