BARACUDA-Legend-1

[wizz737]

Help power supply problem

Hi Folks, my bara has developed a power supply problem. with a 10.8v supply the -5 volt regulator 79l05 has around -2.5v on output pin,the positive regulator 78l05 is +5v. If I lower the supply voltage to around 9volt the bara will work but with low sensitivity and the -5 will come up to -3.5v. I tried changing out the 79l05 but no change. I'm thinking maybe the 7660 is defective. any thoughts would be appreciated.

[Vermeer111]

ahhhh my mistake i mean 5534 with the lt1115

[silverdog]

lt1115 is not pin compatible and not a jfet opamp
you can use tl071 / tl081

apologies, make that tl072 / tl082

[porkluvr]

LF412 is a dual opamp. LT1115 is a single (also TL071, TL081). They are not interchangable.

edit: Now, if you would be wanting to replace the NE5534 with LT1115, that might work. But whether it would work without having to make some other changes, I can't really say. The compensation and offset-null pin connections are about the same so it might work, but no guarantee.

Linear Technology does not give an example of how any compensation capacitor should be connected in the LT1115 datasheet and you should not assume that it would be exactly like the NE5534 connection.

[silverdog]

I have a Question can i change the lf412 with a lt1115 (lower Noise!) my Question is have anyone do this and is the Pinout the same?

lt1115 is not pin compatible and not a jfet opamp
you can use tl071 / tl081

[Vermeer111]

I have a Question can i change the lf412 with a lt1115 (lower Noise!) my Question is have anyone do this and is the Pinout the same?

[wizz737]

Baracuda working

Hi Folks,received my Bara kit from Silverdog last week and finally got to put it together today. I must say hats off to Silverdog for this awesome Kit . Spent about 4 Hours on the pcb and then wound up a quick test coil ( 28t 9" form wire size 0.5 ) hooked up a 9v ni-cad battery for testing,adjusted offset,delay and threshold and bingo the Bara was picking up a Canadian $1.00 looney at 23cm . Can't wait to see what the Bara will do with a fast coil and a good battery pack. Thanks to all on the forum for you input on the Bara, I read all threads several times sure helped in getting good results .

Cheers.

[wesam]

yes its save my bara come from him,very fast delivery,you can pay via paypal,many members from the forum brought his kit from silverdog,very good quality,when you have problems with this kit you can ask the members in this forum,in my kit i have only a faulty 7660 (change with a good one and all is runnig)and 1 resistor (100 ohm)i have double in the kit,soldering on th pcb then make a coil then you have a good Metaldetektor greetings from tha harz forrest

thank you very much

[Vermeer111]

yes its save my bara come from him,very fast delivery,you can pay via paypal,many members from the forum brought his kit from silverdog,very good quality,when you have problems with this kit you can ask the members in this forum,in my kit i have only a faulty 7660 (change with a good one and all is runnig)and 1 resistor (100 ohm)i have double in the kit,soldering on th pcb then make a coil then you have a good Metaldetektor greetings from tha harz forrest

[wesam]

Hello Wesam i don,t have the Barracuda on eagle but you can buy a Kit from Silverdog very high Quality and its very simple to built and with proper setting you get good detection range greetings from the harz Montains

Thank you very much
but Is it safe to deal with this company?
or any body try to built this Kit?
Thanks

[Vermeer111]

i have shielded with the Material from 3M (i think 3M 24) an in the Moment i dont have a Box all on Bench my shield is going on PCB

[bernte_one]

hello vermeer

which material did you use for shielding
best is thin mylar foil (rettungsdecke)
and did you connect shield to detector or box?

[Vermeer111]

Hello Wesam i don,t have the Barracuda on eagle but you can buy a Kit from Silverdog very high Quality and its very simple to built and with proper setting you get good detection range greetings from the harz Montains

[wesam]

detection range is ok for you coil
but normally you dont need the fine tuninh delay pot
use a multiturn pot or multiturn trimmer
so you can fine adjust easy


regards bernd

Hi

I wonder if any body could help me to get Baracouda schematic by Eagle pcb
I would be grateful

[Vermeer111]

normaly yes but by my machine i have tested with the "extra pot" an without,without the extra pot i have poor detection range so 20 cm on 1 euro coin and then with this pot (10 k fine delay) with sw 1 on,treshold in the middle,10 k fine delay 0 ohm,25 k delay on the board adjust that the tone go to silence then sw 1 open and adjust 10 k pot fine delay to the best detection range,30 cm a 1 euro and the small gold ring from my wife 27 cm in air without this only 20 cm 1 euro and 10-12 cm the gold ring all with a shielded coil 216 mm 0,5 mm enameled copper wire 22 turns i have brought the set from silverdog a wonderful kit only i have a faulty 7660 substitute this with a good one and all is running.