Why PD3200 has different component tested board and schema ?

[ashkelon]

Hello friends
I am playing copy/demo pd3200 to make a similar detector.
more important components are different tested board and given schematic. the user manuel imformation and schematic not allow us to reading non-ferrous metals. This is not possible demo program and your written program, because of the wire thickness and R41-R42-R43 resistor values in manuel.
Its very hard to move slope part while detecting metal. Ferrous metals are easer to read because these signals occur end of the slope part.

If you make a coil 1mm wire and 22turn, 38cm, inductance is higher and contain the reading part of the non-ferrous metals. User manuel explaned the higher inductance , change 470 ohm to 1K but sensitivity more poor.

whats the orginal values of these resistors and coil detail ?

[Alexismex]

hello ,
My board is different but i have
R41=470 R (your 310?? )
R14= 470 R (your ????)
Do not exist in my board (your 220 ?)
For the coil your must experiment many times, making many coils ....i was working 10 days in this board !!! but never have good result for discrimination and also poor depth (60cm for a aluminium coke)...Another friend also work hard to try to have results but nothing else...with another board trying many sequences in program !!!!
Yes in the video you can see some discrim ...but really it is easy to adjust the target distance for to have the "discrim result" like you want ....it is not the minelab discrim ...never

[ashkelon]

R41=470 R (your 310?? )
R14= 470 R (your ????)
Do not exist in my board (your 220 ?)
"Alexismex"
my board resistors are same with you, but i say that , in picture pd3200 orginal and has different value components.

don't worry, orginal pd detect the cola can 80cm away, i never see 1m detected MD with 38cm coil.

[ashkelon]

PD3200 sample and hold scope pictures