Surf PI Pro

[au1]

which one is this ?

Just above LT1115 (NE5534). It's also on the placement drawing marked "12R" And on the photo of Apberg's board.

Counting the caps on Apberg's finished board there are 19 caps. Appears theres two unaccounted for.

[sdesic]

And I found 470 uF from PCB layout that is not on my list... where is it on schematics ?

12R on schematics is R34 150 Ohm (1 W) and there is not

[sdesic]

There is also 100 nF beside IC4066.

[au1]

where is it on schematics ?

I didn't see it on schematics. Thats one of the issues I've encountered. But it is on Apberg's board. It appears to be part of Apberg's circuit for the sound but not on the schematics.
Here's another issue. Your list is showing 30 fixed resistors. I can only count 29 on Apberg's board.

12R on schematics is R34 150 Ohm (1 W) and there is not

R34 goes in the board near the bottom right corner. Marked R34 22r on placement. The schematic just says 150 ohms. It doesn't look like a 1 watt.

[sdesic]

I think it is double potentiometers ... on schematics it's R and on PCB position pic it is only pot.

[sdesic]

R34

R34 22R is on part placement - R34 is 150 Ohm on schematics ...

[sdesic]

SURF XX part list (update):
C1 22 nF
C10 1 nF
C11 1 nF
C12 1 nF
C13 220 uF
C14 220 uF
C15 220 uF
C16 100 nF
C19 100pF
C2 2200 uF ( 1000 uF)
C20 100 nF
C3 100 nF
C4 100 nF
C5 220 nF
C6 220 nF
C7 1 uF
C8 47 nF
C9 1 nF
D1 1N4148
D2 1N4148
D3 1N4148
D4 1N5819
D6 1N4001
IC1 TLC555
IC2 NE5534 or LT1115
IC3 LM358
IC4 CD4093
IC5 78L05
IC6 ICL7660
IC7 CD4066
P 10k Potentiometer
P1 100k Pot. gain
P5 10k Pot. delay
R1 100k
R10 100k Pot. offset
R11 22k
R12 10k
R13 1k
R14 1k
R15 470k
R16 470k
R17 10 k
R18 47k
R2 5k (3k3)
R20 47k
R20 47k
R21 1k
R21 1k
R22 220k
R23 22k
R25 5k1
R26 51 k
R28 240k
R28 240k
R29 51k
R3 3k3
R33 1k Pot. volume
R34 22 Ohm
R34 150 Ohm schem.
R35 100k
R36 12 Ohm 1 W
R4 2k2
R5 1k5
R6 390 Ohm 2W
R7 1k
R8 1k
R9 1M Ohm
T1 Q1 2N3906
T2 Q2 IRF9640
T6 Q6 MPSA13

[au1]

sdesic,
Finally got all my parts and applied power. Works good. I still have coil configurations to test but the first one I used is 23 turns, 28awg, 8 inch diameter.
Picks up a penny or quarter at 8 inches. Picks up my steel toed boot at 12 inches. Here's alist of parts I used.
SURF XX part list (update):
C1 22 nF
C10 1 nF
C11 1 nF
C12 1 nF
C13 220 uF
C14 220 uF
C15 220 uF
C16 100 nF
C19 100pF
C2 1000 uF
C20 100 nF
C3 100 nF
C4 100 nF
C5 220 nF
C6 220 nF
C7 1 uF
C8 47 nF
C9 1 nF
D1 1N4148
D2 1N4148
D3 1N4148
D4 1N5819
D6 1N4001
IC1 TLC555
IC2 NE5534
IC3 LM358
IC4 CD4093
IC5 78L05
IC6 ICL7660
IC7 CD4066
P 10k Potentiometer
P1 100k Pot. gain
P5 10k Pot. delay
R1 100k
R10 100k Pot. offset
R11 22k
R12 10k
R13 1k
R14 1k
R15 470k
R16 470k
R17 10 k
R18 47k
R2 5k (trimmer) set at 3.3k
R20 47k
R21 1k
R21 1k
R22 220k
R23 22k
R25 5k1
R26 51 k
R28 240k
R29 51k
R3 3k3
R33 1k Pot. volume
R34 150 Ohm
R35 100k
R36 12 Ohm 1 W ( I used a 10 ohm 1 W.)
R4 2k2
R5 1k5
R6 390 Ohm 2W
R7 1k
R8 1k
R9 1M Ohm
T1 Q1 2N3906
T2 Q2 IRF9640
T6 Q6 MPSA13


This is one project, unlike most of the others I've built, that won't end up in the junk bin. Appears the only thing missing is a pinpointing mod.

[sdesic]

I am waiting for IC's and almost finished with other components.
>23 turns, 28awg, 8 inch diameter.
I think that diameter of 20-21 cm is OK that is about 7.8" - 8.2"...
can you measure your coil in Ohm ?

Look at this thread for some ideas...
http://www.geotech1.com/forums/showt...-effectiveness

or this site for making Surf PI (coil and all)
http://www.adrianandgenese.com/blogg...rom-a-diy-kit/

[au1]

I would have had mine finished last week but forgot to order a 4093. The coil measures 2.3 ohms. I've read alot about coils and think that 21 turns might be better. But for the sake of wire I elected to start high and then reduce by a turn. Still experimenting with wire guage. Just tried with 22 awg and not so good results so far.
Have you seen the pinpointing mod somebody posted for the surf pi older model? I know very little about electronics but can sometimes follow directions if they're in english.
Thanks for the links! I'll check them out.

[au1]

http://www.adrianandgenese.com/blogg...rom-a-diy-kit/

That was a great link. Wish I had seen that before. Gives a different variation on the coil. All the steps are detailed with photo's. One doesn't have to be concerned that more than one project is being discussed in the same thread. I see my ohms are still a bit high which leads me to believe that if I'm getting 8 inches of distance now on a coin, then it will most likely get much better.

[sdesic]

Have not seen pinpoint mod for surf pi yet... maybe you shoul'd adjust this one first for more depth or something.

[sdesic]

I think that is very nice page, all in one place from kit to working condition and with coments and original instructional manual.

Have you seen any video of home made surf pro in action ?
I had only seen one from bernte_one ... on the beach searching his coin...

[au1]

I haven't yet altered my first coil. But 1.4 ohms seems to be the desired resistance. And my first was 2.3, I think. I'm attaching the pinpointer mod I was talking about. It came from here but in the surf pi first edition. Once you build your detector then you will see that if you move a coin across it and stop, the sound stops. I have a friend that owns a White's 5000, I believe it to be. His has a pinpointing button on it. Momentary open. Just not sure how to implement it on this version. But I do know someone locally that is pretty good at this stuff. I'll ask him next time I see him about it.
As far as video, I live in the backwoods, hill country. The only option for anything close to high speed internet is satelite. It's over priced and still not fast enough to watch videos.
What are you going to use for power? I'm using a 9 volt battery at the moment.

[sdesic]

You are using 9V battery ... there is your problem with depth... if you use 12 V range of detecting will be greater.