BARACUDA-Legend-1

[ApBerg]

PCB

Board... draw by hand old tech

Hello Alexis,

Have made a start to make a single side pcb from your schematic...
If you have some spare time can you also give it a check ? if you find errors .... please tell, if needed I can mail you the sprint file. ( if no errors also here on Geotech )

Best regards.

Ap

[Geo]

Bravo Aq.
Good work!!!

Regards

[nelson]

Hi ApBerg.
I am also interested on barracuda, so can you send me sprint layout file to [email protected]?
In advance many thanks
Nelson

Hello Alexis,

Have made a start to make a single side pcb from your schematic...
If you have some spare time can you also give it a check ? if you find errors .... please tell, if needed I can mail you the sprint file. ( if no errors also here on Geotech )

Best regards.

Ap

[WM6]

Bravo Aq.
Good work!!!

Regards

Yes, very nice design, as usually from ApBerg.

[dom44]

about the filter your talking about Alex i Built mine by your hand drawn circuit it shows the resistor as 2m2 with the diode and 4n7 cap in parralel going to pin 7 of the 7660 also when i put my scope on pin 7 there is no signal coming out of it i must be missing something?
and when i read the data sheet on the 7660 says pin 7 is used to control the osscilator and reduce runing current as well as Synchronizing to an External Clock.

[Alexismex]

Hello Dom,
yes pin 7 of the 7660 is controled from the pulse PPS of the Barracuda in this way is syncronysed at the same Fcy, you can check in the photo the arrangment "off board"

[Alexismex]

Hello Berg,
Good work, you have good skill men!!!bravo... i have check your board i encounter :
- Q1 is TIP 127 not a Fet...
- Pin 4 of U2 goto C9 and pin 7 of U2 goto C8 ( the denomination is just inverted) ,not very important....
- D11 must be inverted ,ok
i just see that
For the moment it is ok because i check and recheck several times for make the drawing of the schematic ....NOW it is time to populated your board and go to the Baracuda party !!!! and also we have another schematic from the blurr copy that will confirm all data ...Efforts will give a good result and satisfaction ...because for me the Baracuda is much better that the Surf...far
When you check take the COIL L1 with inductance 453 uH and resistance 1R4
Thank again to make the board...
Have a good time
Alexis.

[ApBerg]

Hello Berg,
Good work, you have good skill men!!!bravo... i have check your board i encounter :
- Q1 is TIP 127 not a Fet...
- Pin 4 of U2 goto C9 and pin 7 of U2 goto C8 ( the denomination is just inverted) ,not very important....
- D11 must be inverted ,ok
i just see that
For the moment it is ok because i check and recheck several times for make the drawing of the schematic ....NOW it is time to populated your board and go to the Baracuda party !!!! and also we have another schematic from the blurr copy that will confirm all data ...Efforts will give a good result and satisfaction ...because for me the Baracuda is much better that the Surf...far
When you check take the COIL L1 with inductance 453 uH and resistance 1R4
Thank again to make the board...
Have a good time
Alexis.

Hello Alexis,

Made some corrections, send also the Sprint Layout file now.....but I have not build the board (yet) so there can be errors in it !

If anybody make's the pcb it is at his own risk !! (pfff.. I do not like this...) but I have no time to make the pcb in the next weeks ...

Best regards.

Ap

[Patrick]

Very nice work.
- Q7 appears inverted.

[porkluvr]

Very nice work.
- Q7 appears inverted.

According to a Fairchild Semiconductor datasheet, 2N5484~6 have interchangeable S and D terminals. Just make sure to get "G" in the correct hole and all is OK.

BUT... I don't know about the MPF102 being such a wonderful substitute. Some individual MPF102 devices may work better than others.

Thanks for the great work, Alexismex, ApBerg, Kt315. By the way, I apologize for having previously impugned the Baracuda circuit. My LTspice schmitt trigger models have important details "starred out". I was wrong.

[nelson]

Congratulations Alexismex and many thanks for supporting metal detector construction
Best regards
Nelson

Hello Alexis,

Made some corrections, send also the Sprint Layout file now.....but I have not build the board (yet) so there can be errors in it !

If anybody make's the pcb it is at his own risk !! (pfff.. I do not like this...) but I have no time to make the pcb in the next weeks ...

Best regards.

Ap

[dom44]

I used 2N5484 fet in mine works no problem at all

Domenic

[nelson]

Hi dom44 and congratulations for your good job.
Also can you post test results for Barracuda?
Regards
Nelson

I used 2N5484 fet in mine works no problem at all

Domenic

[dom44]

With my detector i am getting about 30cm with a 2cm 20cent Australian coin clear but i am using a fast coil i built for another detector havent tryed it with the correct coil yet, and i used a MJE3055 transistor for coil drive, so iy has good performance for sure. here is a pic i have a 7905 temporarily in it till i get a 79L05.

[dom44]

I also noticed something about this circuit the led is very dependent on the impedence of the head phones with out the right match the LED does not work correctly will light brightly if impedence is to low or not at all if to high.