Sandshark schematic

[Carl-NC]

Finally found my hand-drawn schematic, which was a mess, so I made a new one. Obviously a lot of ancillary details are missing, and I don't have time to do any more work on this, but what matters is here and the rest is easy to figure out.

- Carl

[6666]

Thanks Carl
much appreciated

[ivconic]

Awfully HUGE and GIGANTIC schematic!
I guess it took hours and hours of hard labour to get it!?

[Carl-NC]

Yup, not much to it but it I'm sure I spent a few hours tracing it out. It's a tightly packed SMT board.

[mario]

Its not suppose to be that bad: http://www.metaldetector.com/learn/f...ark-field-test

How can we finish this project and replace the micro with our own? What needs to be done?

[maikl]

Perhaps one way would be to make the Piranha, which was the forerunner of the present Sandshark. Unfortunately I do not have a complete schematic of any of them ...

[Carl-NC]

SS performance isn't great. The printed spiral coil, somewhat short pulse width, and excessive sampling delay limit performance. All this is easy to fix. What's left is to pick a micro (any common PIC will work fine) and write some code.

- Carl

[Carl-NC]

Perhaps one way would be to make the Piranha, which was the forerunner of the present Sandshark. Unfortunately I do not have a complete schematic of any of them ...

I'm told the Piranha was basically a copy of the Surfmaster PI. The Sandshark is the Piranha with a PIC micro.

[Geo]

So... construct a Surfmaster

[Carl-NC]

PIC offers more flexibility.

[maikl]

I'm told the Piranha was basically a copy of the Surfmaster PI. The Sandshark is the Piranha with a PIC micro.

Carl-NC thanks for the explanation. I assumed, but i wasn't sure the Piranha was basically a copy of the PI Surfmaster.

[kt315]

Carl-NC thanks for the explanation. I assumed, but i wasn't sure the Piranha was basically a copy of the PI Surfmaster.

what you hope yet to get on? Carl has made the great well-described compilation and that is hard enough in PI matter. make HH and you will get and Piranha and Surf PI and any PI you can only imagine of.

[maikl]

kt315 thanks for the advice but for now I will not make a second detector, because I am very satisfied Barracuda. What I will do his experiment with different types of coils for better detection of small gold. Some ideas I've picked up from Russian forum...

[kt315]

there is not the idea in these textolite coils, Maikl. if you had noticed (i hope) Andrej Fiodorov (andy) uses only basket type coil in last Clone as it has minimal parazitic feedthrough turn-to-turn capacitance. do not waste a time on them...

[maikl]

Yes i saw the coil of Andy and several other variants. I do not plan to make the "PCB coil" etching copper with classical PCB but only by means of wires. I have a lot of wire just a little time and I'll play around a bit ... Best regards.