BARACUDA-Legend-1

[ApBerg]

Hello Wiltran,

Yes, I used both, like the Irf fets... I do not hear differents in sound.. can be my age......

[maikl]

Hi ApBerg. Have you measured the inductance and resistance of your coils. Alexismex recommended that 450uH inductance and resistance 1R5. Geotech Forums provides other information coil 8" 545uH 1.24ohms http://www.geotech1.com/cgi-bin/page...oils/index.dat You damping resistor is not 330R. On the first PCB is a 402R on the second PCB is a 19R?

[ApBerg]

Hello Maikl,

First , I believe you and Alex that you can hear different in audio response, there are more people that say they can hear the different in audio response . I made only some air test indoors using some different coils and damping resistors to get the best sensitivity but perhaps not the good combination …( had have mentioned that…)
Now busy with some unwilling logger …. if I have that thing running I will give it a tray to make the coil/resistor combination you told .
But for the results so far I think that the Baracuda is a very nice detector that, when you have learned it by experiments outdoors, will give very good results !

Best regards.

[bernte_one]

video of working baracuda legend

has anyone a video from his working baracuda legend?
please link it here
http://www.geotech1.com/forums/showthread.php?t=17538

thx

[ApBerg]

Baracuda test video on YouTube.... hope it works....

http://www.youtube.com/watch?v=EoWrGNiQfaM

Test object was a medium-size goldring, coil 20 cm. Fet used IRF9640 and used 390R
Pcb board from ......... ........make a guess

For tune potentiometer 22k can be used .. For the 2N2222 you have to check the E/B/C connections ! I use Metal version instead Plastic one's think the connections are 180 deg. turned.
The text markings on the board ( and sprint layout file ) are good.
Best regards.

Ap

[lunamay]

can anybody say something more about coil? induction, resistance how to make it
best regards

[bernte_one]

great performance!

at mine only a 2,2m resistor is missing i should finish it i think.

thx for the video ApBerg

[ApBerg]

ICL 7660

It can be that there is a problem with the ICL 7660... it can only go to 10.5 volt ?
In the baracuda schematic it is connected to the +batt so it can give problems if there is more than 10.5 volt connected ?
Thanks Leon for warning !

[ApBerg]

Look at the datasheets ....

[6666]

Where did you get the PCB ?
thanks

[smity]

In the scheme will work only 7660A and 7660SCPAZ. Sincerely.

[smity]

SW 1

I ask more to write about the button SW 1. How to use it to configure the device? Thanks in advance.

[ApBerg]

Hello Friends,

The pcb are from ...Silverdog... but before release he first wants to know if there are no errors in it !
I mostly make my pcb's myself...part from the hobby... but the Silverdog's pcb are very nice and do not cost much...

For the SW1 button...I think it is for battery check...I have not used it so I am not sure..

Best regards

[ApBerg]

In the scheme will work only 7660A and 7660SCPAZ. Sincerely.

Hello Smity

Thanks for checking, perhaps a diode in the + batt to the ICL7660 can give some drop in volts.. just to be sure ?

[smity]

Hi Appie!!! I think that the button need to adjust the sensitivity threshold. I did so .... Resistor "threshold" put in the middle position .... Closed the button .... Turned resistor "delay" in a situation where a constant audio tone passed in silence. All the more to the controller delay, I did not touch. Later you can add a "threshold" to the desired level .... Very good sensitivity to small objects made of gold (1gramm pendant and earrings 1.2 grams). Thank you so much Appie, and Alexismex! You did a great job. Sincerely.