BARACUDA-Legend-1

[kt315]

new pics of new rev B pcb

[kt315]

NE5534 in SO8 package on Bara board setted via adapter DIP8-SO8

[ripsdevala]

Just curious.... why my pinpoint coil make a sound (speaker to) when metal object at 0 cm, is that normal?
7.5mm diameter ferit, 100 turns

[ripsdevala]

The pinpoint is very good to, 1 cm resistor legs is detected

Thats why its very hard to find it in the ground with naked aye and search coil.

[Koala]

Yes I think, its ok now tho.
Done it, max 25cm for coin, will use it in the field while I wait for rev.3 release.

For now I need pin pointing probe, the last time i use the md its very difficult to find a nail without an effort.
Do you have a simple circuit to use with what lying around here...
- Ready to use Bfo
- Assembled unused Bara
- Etc
..

Sounds about right. This is the best compromise I could get on all targets. http://www.geotech1.com/forums/showt...893#post215893

[ripsdevala]

Mehhh...make a tiny coil and attach to MD will do the job.

[ripsdevala]

Yes I think, its ok now tho.
Done it, max 25cm for coin, will use it in the field while I wait for rev.3 release.

For now I need pin pointing probe, the last time i use the md its very difficult to find a nail without an effort.
Do you have a simple circuit to use with what lying around here...
- Ready to use Bfo
- Assembled unused Bara
- Etc
..

[Old cart]

Let me see....
$180 .... too much for me.
Old cart, what if i dont get +5 out on 78L05, but a negative. Is my 7660 is broken?

It is only about $100 in the US. Funny becuase it is made in China!
As far as negative voltage out of 78l05 you must have your leads to the meter reversed. black should always go to grnd (battery minus) What is the reading?

[ripsdevala]

I think im wrong cableing, test out of the box work fine.
How is mike progress on rev.3, hope will finish soon

[ripsdevala]

Let me see....
$180 .... too much for me.
Old cart, what if i dont get +5 out on 78L05, but a negative. Is my 7660 is broken?

[Old cart]

good cheap scope

There is firmware upgrade when i google, maybe can inprove the reading

@old chart leme do some research...

i did some research. For a cheap scope check out the Owon VDS1022I model. This has everything you might need. You do need a notebook PC to run it though. This model is unique in its price range be uses it has an isolated USB which keeps you from blowing up your PC!

[ripsdevala]

Ohh... its ground, okay
Cut 220uf track and make a bridge would be work right, and for two 10uf i will make a new hole.

Btw the MD is working alright, on the ground the sweep beep almost gone, only the magnetic ground that have long beep at first contact.

[Old cart]

I see... Change two 220uf and add 10uf to 0v, btw where is 0v track according to Queozi mod?
Qiaozi mod
[ATTACH]36376[/ATTACH]

My current board, please dont scold me tin every where
Top
[ATTACH]36377[/ATTACH]

Bottom
[ATTACH]36378[/ATTACH]

And this is unfinish bara, i will use it as pointing detector.
[ATTACH]36379[/ATTACH]

Thanks for supporting me old_chart.

I think you have it. The 0 volt track is the one attached to the minus side of the battery.It usually runs around the outside edge of the board, but you should be easily able to trace it from the battery- lead.

[ripsdevala]

I see... Change two 220uf and add 10uf to 0v, btw where is 0v track according to Queozi mod?
Qiaozi mod


My current board, please dont scold me tin every where
Top


Bottom


And this is unfinish bara, i will use it as pointing detector.


7.5v battery is working, same as full 12v battery, 12v make 7660 warm.
Thanks for supporting me old_chart.

[Old cart]

I use 2x 9v battery in pararel, now im using 8x AA 1.5v to get 12v.
My board doesnt have 47uf and 10uf polarity caps, the big one is 6800uf, in that scheme is 4700uf, its very different with ver.2

For more details on what is likely going wrong read this thread.

http://www.geotech1.com/forums/showthread.php?23009-Baracuda-Build-(silverdog-kit-Rev2)/page3

focus on post 102 but read the whole thread and make notes.
you may simply have the power supply wrong and this could be blowing out the (new) 40106.