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]

I don't know why is that resistor changed, I will use what ever is on paper... don't want any new changes...
This PI has already 4 different potentiometers, don't need more adjusting, I will use basic coil.


>So you think the resistor marked 12r is 150 ohms? I had that on my bom. I was going to use a 1 watt.
which one is this ?

[Davor]

On Apberg's board there's a resistor that appears to be a 1 watt.

Beware of the font glitch - symbol for ohm is often at the same place in a code map as a letter "w" so it just happens. In this particular case it is so because of the high voltage, and it makes sense. 1W that is.

[au1]

Large cap 3900uF was 1000uF, for NE 5534 now LT1115.

Ok, thanks I missed that. So it appears now if you use NE5534 = 1000uf cap.
If you use LT1115 = 3900uf cap.
Yes, I see Apberg used a fixed resistor 3k3. But the etched board has place for trimmer. I was reading in the Surf PI (older version) where they used a trimmer and I have one allready. Has to do with adjusting the coil.
So you think the resistor marked 12r is 150 ohms? I had that on my bom. I was going to use a 1 watt.

I've etched my board and installed ic sockets and jumpers. Some of the parts I have here allready.

[sdesic]

There is also C19 100pF

[sdesic]

I didn't start building yet, I am still collecting parts, so I looked at this schematics...
From that picture of assembled board ApBerg used fixed resistor 3k3
And C2 is 3900 uF at his photo... page 4 in this thread

***** C8 is 47 nF ***** it is my mistake ****

[au1]

Sdesic,
It looks like R2 can be either a 5k trimmer or 3.3k resistor. I elected to use a 5k trimmer. What are you using for C2? 1000uf?
For C8 I have 47nf instead of uf.
On Apberg's board there's a resistor that appears to be a 1 watt. Just above LT1115 (NE5534). It's also on the placement drawing marked "12R" ?

By the way, thanks for your input.

[sdesic]

I am trying to make a list for Surf XX ...
parts are not matching PCB and schematics
C2 is 2200nF on PCB and 1000uF on schematics (+12 V and ground) ... bigger is better ?
R2 on PCB is 5k and schematics says 3.3k

Here is list of parts for Surf XX:
C1 22 nF
C10 1 nF
C11 1 nF
C12 1 nF
C13 220 uF
C14 220 uF
C15 220 uF
C16 100 nF
C2 2200 uF ( 1000 uF)
C3 100 nF
C4 100 nF
C5 220 nF
C6 220 nF
C7 1 uF
C8 47 uF
C9 1 nF
D1 1N4148
D2 1N4148
D3 1N4148
D4 1N5819
D6 1N4001
IC1 TLC555
IC2 NE5534
IC3 LM358
IC4 4093
IC5 78L05
IC6 ICL7660
IC7 4066
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 150 Ohm
R35 100k
R4 2k2
R5 1k5
R6 390 Ohm 2W
R7 1k
R8 1k
R9 1M Ohm
T1 Q1 2N3906
T2 Q2 IRF9640
T6 Q6 MPSA13

If I made a mistake please correct me...

[6666]

The bottom part of the shaft is generally non metallic .

http://www.geotech1.com/forums/showthread.php?17958-detector-stem&highlight=crutch

[sdesic]

I am going to build Surf XX.
Part list is not available... I must collect from schematics

Bought aluminium crutch for shaft, housing for electronics, t-shirt transfer paper for etching, pertinax...
parts are waiting for final list.

Aluminium shaft or part of it... can it be a problem for detection?

[bernte_one]

design from james is prooven also like the design from apberg (surf xx)

i made two boards of james owen layout the next will be surf xx

placement for some part is better there, it has also a trimmer for pulswidth include

so boards a working same but there are some improovements on surf xx included
regards

[sdesic]

There are few different models of Surf PI Pro...
SurfXX PCB and SurfPi Pro James Owen 2012 PCB ... are they the same device with only difference in PCB design ?

[au1]

SurfXX

Have downloaded files titled SurfXX posted by Apberg. Found here http://www.geotech1.com/forums/showt...516#post149516 I Etched board but some of the components are questionable, to me. Could you kindly post a
partslist?
Thanks

[ossamaussama]

note

yes sure delay will have effect

surf pi is not suitable for searching in Land

only sand or beach area


another note

there is no good gradual change in volume so cannot estimate if signal is week or strong

trying to use audio VCO circuit
or voltage level indicator such as analogue voltage meter or led voltage indicator with LM324

[ossamaussama]

@ ossamaussama

Thank´s for your Posting


With this data could i fix my Delayproblems.

yes sure delay will have effect