Rating the projects

[6666]

Well here is what happened
by simply swapping r18 and r22

the air test sensitivity
went from

USA 1 cent 5"
Australian 20 cent 7 1/2 "
1 Euro 7"

to
USA 1 cent 8"
Australian 20 cent 9"
1 Euro 9"

So I am very happy with the improvement
give it a try
6666


Andy I see you have changed the part numbers and schematic
thats easier than changing the silkscreen
Admin please delete my post #16

[Comp]

[QUOTE=6666;140469]Well here is what happened
by simply swapping r18 and r22

the air test sensitivity
went from

USA 1 cent 5"
Australian 20 cent 7 1/2 "
1 Euro 7"

to
USA 1 cent 8"
Australian 20 cent 9"
1 Euro 9"

So I am very happy with the improvement
give it a try
6666


So, thats at least three of us managed to cock it up, & build it wrong!!! LOL!!
Never mind, easy put right,...... It may seem an easy project to you 'Old Timers', but for us 'first builders', easy to make a mistake.

I wonder if there is also any merit in asking Carl for a 'Surf PI' section in the projects section??? I know I would have found it useful, as a beginner, and, as I 'tweak/play' with the unit, (trying different coils, damping resistor, perhaps trying to vary the gain in the 358, to simulate a Surf Pro, ) I will have loads more questions to ask.

It seems an ideal first project to me, and I bet it is very popular at the bargain price Silverdog does them at...

Cheers all, Fred

[6666]

Fred its a top quality project from Silverdog
ideal for anybody to build
simple and it works well.
5/5

Surf Pi
Ease of build -
Initial setting up -
Sensitivity 8" mono -
Cost/availability/part sourcing -

[Comp]

Fred its a top quality project from Silverdog
ideal for anybody to build
simple and it works well.
5/5

Surf Pi
Ease of build -
Initial setting up -
Sensitivity 8" mono -
Cost/availability/part sourcing -

Ok thanks for that,... thats now quite a decent detect depth, care to share details of your 8" coil????

Cheers, Fred

(Oh, & to the O.P.,, I am thinking of having a bash at an IGSL - TGSL build,.. (might be a while before I get to rate/ finish it, though,,,, think the coils will be my holdup!! LOL!)

[usta]

Hi friend's
please let me know, can i use the deltapulse sound generator in surf pi? if yes please let me know how? ( please drow in schematic)
thanks in advance

[mikebg]

Hi friend's
please let me know, can i use the deltapulse sound generator in surf pi? if yes please let me know how? ( please drow in schematic)
thanks in advance

Usta, simply connect it to output of U3A in schematic on post #10 or #12.

[usta]

Usta, simply connect it to output of U3A in schematic on post #10 or #12.

thank you Mr
is this correct?!
and +v and -v connect to where?(for example +v to +12 volt or +5 volt?) (and -v to -5volt or GND?)
thanks in advance

[6666]

Comp I will try and take a picture of the coil for you with specs

[homefire]

Ok, so now I'm confused.

What is the Propper Values for R 18 and R 22?

[golfnut]

if you populated your pcb by looking at the screen print on the board - you will have made it wrong.




original schematic is correct

resistor between pin 1 and 2 of U3a is - and should be 100k... (R22)


R18 is 47k and should go from end of the variable resistor to -ve rail.


build it like my text for extra depth

steve

[bernte_one]

Baracuda
Ease of build -
Initial setting up -
Sensitivity 8" mono -
Cost/availability/part sourcing -

[golfnut]

I hadnt considered the Baracuda - what are its features? Is it a Surf in a slightly different style?

[Comp]

Anyone able to rate the IGSL???? I am thinking about trying this as my next build, have ordered the Musketeer and TGSL PCB's, I suspect the tricky area is going to be the coils,.... I am reading up on the threads, but one or two of you must have put these together,.... any input, Guys??


Cheers, Fred

[golfnut]

Id say the IGSL and TGSL will detect approx the same depth.#


IGSL can be fiddly to build for some.


Id ask why have the ferrous channel? Not many people want to hear bleeps from bits of rusty tractor!!

I may switch the ferrous channel off on mine - then its a TGSL ?


The coils are ok to make - 1hr each. getting them mechanically locked to your shell (nulled) can be fun - its not a five minuter like a PI mono. I flooded my coils with polyester resin for boat building..





The holy grail is a pokey descriminating PI - and they do exist.

Steve

[kliner]

I've dug a lot of oxon shoes from fairly deep with quality bought detectors because even with good discrimination they can sound good. The idea of the IGSL was to give the two tones at the same time to tell you that the target it is in fact iron