Sandshark schematic

[kt315]

I thought the Etched coils were good on small gold! Not True?

true. like LRL is good on the nuggets. BUT... there is a question! where you get these Mythes' massive, man?
are are ready TRUE? we go to you NOW!




there was good old time I did capacitors of low value. I cuted a textolite on parts and solder pins to them. 1...5 pF on lendth 1 cm. no problem was to get the capacitors!!!

[homefire]

I thought the Etched coils were good on small gold! Not True?

[Sean_Goddard]

PIC offers more flexibility.

AND NOISE!!

[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.

[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]

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]

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]

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.

[Carl-NC]

PIC offers more flexibility.

[Geo]

So... construct a Surfmaster

[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.

[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

[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 ...

[mario]

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

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

[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.