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Re: barracuda schematic
Hi Gene,
There doesn't exist a PCB of this Barracuda PI schematic. Because I "redraw" only the schematic circuit from a blur original copy.
Chris -
similar shematics
hello.
I see nothing of diffirencies the schematic from Hammerhead project absoliutely. it's worth of time to do a project from zero point. the time is a money... the money is the gold toothes...
yours sincerely
Anatolij
Lithuania welcomesComment
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Re: similar shematics
Thank-you Anitolij,your right again! I will try on pcb 123 software and post it if I finish. I heard this was a great detector at one time long ago. Thank-you Gene L.Comment
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Re: similar shematics
Has anyone used a barracuda or hammerhead for nugget- searchingComment
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Re: similar shematics
Hi Chris,
If things go right, I hope to give the HH a try in a couple of days. I normally use a GQ clone when I nugget hunt but I built up a second HH and want to try it to see how well it does.
The trip will be more of a test than anything since I am not going to a location where I have found gold before, but the potential is there.
Now, I will add that my HH is modified some and I will use a DD coil most of the time. I will probably try a mono for a while, but not for long if the ground conditions are bad.
RegComment
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Re: similar shematics
Hi Reg, I hope you post the results of your hunt. WilliamComment
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Re: similar shematics
Hi William,
It will be a week longer than expected before I get a chance to try the unit in the mountains. Something unexpected came up that required the trip be postponed for a week.
That is ok since I do have a couple of things I could do, or would like to do, to the HH in the mean time. For nugget hunting, a PI has to be pushed to the limit and that is what I am doing to the HH.
In the process, I ran into something on the HH that might be a problem for others also who may be trying to max out their PI. I built option 2 which is the audio increase form of indication of a target.
Now, I use headphones, rather than a speaker, but I could see how a speaker could create a bigger problem.
Anyway, in the quest to increase the max audio volume, I reduced the resistance of R 41 to the point that it caused the unit to be unstable. The audio would cause a drop in voltage which in turn effected the pulse current, which then effected the audio, etc etc.
The point I am trying to make is one might want to be careful when adjusting R 41.
Now as an interesting solution to minimize the audio loading, I decided to try something popular with many ML owners and that was to use Radio Shack mini speaker amp to increase the audio signal. This little amp sells for about $13 so it is a cheap mod.
Well, initially, the mini amp didn't work with the HH so I capacively coupled the headphone jack and got the thing to work extremely well. I was really impressed with the results. I do wish the RS amp has a gain control besides the basic volume control. It would help.
The mini amp provided a lot of additional gain which really worked effectively whether I used headphones on the mini amp or simply listened to the amp speaker.
RegComment
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Re: similar shematics
Sounds like a great idea Reg, I'll have to give that a try. WilliamComment
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Barracuda "the original"
This is the Barracuda revision "D" (maybe original), with error (555 instead voltage converter) and some values isn't in it. Has somebody success with it?Comment
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Thanks Esteban.. very interesting, also KT315 posted this one before.
There are some striking differences between drawings - check the timings part of the circuit (also the most problematic part). Voltages, resistors values...
Also: where is it written what U4 is? Do we only assume 40106 here?
I'll try with new values when I'll have the time... I still have that nonworking PCB I made one year ago.
Geo, Porkluvr, ApBerg... any news on this one??Comment
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Hi Leto.Originally posted by Leto View Post
No results yet. I stop it because now i try a ATtiny4 and 2 LRL
Maybe after a month......
I tried to modify it (the sample pulses) but without results
Never mind
Regards
Comment
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Barra
Hello Frends.
The first board I made was working reversed, metal near the coil made it silend, never made it working, there were also some problems in the pcb layout. Have made a new board in SprintLayout 4, Never even made it...
Making Pcb's is fun, even if I never built them.. (kind sudoku...I think)
The Schematic Esteban has send is having a wrong 7808 must be 7905 for the neg. volt.reg.
Wel send the new pcb, but.... there can (will) be errors in it ! if you have no background in electronics to not make it !
regards.
ApComment
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Hi Ap. How are you ???? long time to read from you.
I constructed the pcb from the schematic that you gave me, but there is problem with the sample timing. I tried to change the timing, using 4538 and 555 but without good results. I must match the voltage of each stage, so it is the same as to construct a New detector
. I leave it and maybe an other time to try to modify again the timing so to make it to work. The basic problem is that the second sample is near to the first, so it minus the signal and the total gignal is near to zero
.
My regards
btw... you make good work with the drawing of pcbs. Who program do you use???Comment
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Hi
Hello,
Can you try making this PCB for me?
Thanks in advance.
http://thunting.com/geotech/forums/s...ad.php?t=13087
I have tryed many times but cant pass the elaments right way.
Originally posted by ApBerg View PostComment
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