BARACUDA-Legend-1

[6666]

Nice job Bernd

[TH Jim]

NICE !

Well done Bernd. Did you make the coil too?

Regards, Jim.

[bernte_one]

thanks for positive comments

i made the inner assembly of coil, the coil shell istself was ordered from georgi (buy sell thread) coil is 27cm and shielded with mylar or other thin al foil und filed with epoxy and foam

regards

[volcano]

Please I need help

Hello all
Please, I want to give me a sketch shows how to make coil and all the dimensions and measurements and diameter copper.

[bernte_one]

detetion of ferrous and nonferrous

hello

i observe that the baracuda is more sensitive to nonferrous object
with optimal delay setting it is a difference for a carpet knife and a screwdriver(ferrous) to copper pcb bord or coins (nonferrous)

could we improve this ability? or i am not right



@volcano

try litz or cable from 24AWG
20-24 turns
diameter 25cm
shielding not necessary
should work

regards

[volcano]

thank you mr bernte_one

But i do not know the 24AWG

please I wont the section with mm2

[silverdog]

0.5mm diameter should be ok

[bernte_one]

thank you mr bernte_one

But i do not know the 24AWG

please I wont the section with mm2

hello volcano

internet is your friend so try to ask internet first
http://de.wikipedia.org/wiki/American_Wire_Gauge
but you also can ask here

regards

[6666]

Try here

http://www.geotech1.com/forums/showthread.php?t=18920

[gcause]

Hi All,

Got my Barra boards back from 6666 yesterday, he has been trying to work out where I went wrong with them. Tried them out today and they work great with the new coil he made up for me.

Just wanted to give a big thank you to 6666 for all his assistance with this it is greatly appreciated.

Cant wait to get out onto the goldfields to try them out. Time for my happy dance

Regards,

Grant

[bernte_one]

hello 6666

can you give some infos how you do the coil for gcause
i have made some in different designs but not sure if there aren´t some
improvements i can made
did you shield the coil ? and which datas: cable, diameter, uH, resistance?

thanks

[6666]

hello 6666

can you give some infos how you do the coil for gcause
i have made some in different designs but not sure if there aren´t some
improvements i can made
did you shield the coil ? and which datas: cable, diameter, uH, resistance?

thanks

Hi bernte_one
there was nothing special about the coil, it was just a 450uH coil made from solid copper wire, thin pvc insulation, about 8 inches, about .47mm, unshielded, I only measured the inductance not the resistance, it was made just to get the project going on the bench for Grant.
6666

[Brian Deese]

Barracuda not working

finished up my barracuda kit tonight,started out good on a 9v battery I damped the coil with about 750 ohms,it was detecting but only a few inches on pliers.The 9v got too low i guess because the -supply was less than -4v so I hooked it up to a power supply to finish the adjustments.I got a threshold when I turned it on with the new supply,I did not have a threshold with the 9v,it lasted for a little while then it was gone,the 5v supplies were solid now,but the coil was ringing and the mosfet was hot.I soldered back in my damping pot, and it will not damp. 175 ohms will just start to get the right shape. coil is .350mH and 3.5ohms about 11.5" diameter not sheilded yet. 28awg teflon wire.Any ideas,I have everything I need to test it.

[silverdog]

I think 28AWG may be too thin, your resistance is high
something like 24AWG may be better

[Brian Deese]

I think 28AWG may be too thin, your resistance is high
something like 24AWG may be better

In bbsailors pdf "Making a fast pulse induction mono coil" He uses 30 awg wire and ends up with 5.4 ohms resistance.The resistance should limit the current in the mosfet to 3amps,which should not make it get hot. Nice kits,I put the surf pi together also but I want to get barra perfect before I move on.