could you do this to a gb2

Hi im not sure but was toying with the idea has anyone thought of done or could it be done. Fitting an external plug to run a bigger battery pack and would that enable you to run a larger coil or would you gain any extra depth? I know some may think it might be silly or why not just get a pulse induction but i was just wondering its a pretty good machine but i just thought maybe you could increse depth would be good and if being able to run a larger coil would aid you at all? Thanks any considerations and thoughts would be apprectiated

You could fit a larger battery pack externally.

You can fit a larger coil. I think the largest offical GB2 coil is 14", in airtesting (grain of salt) the 6.5" coil picks up an ounce at 8" and the 14" picks it up at 14" so yes there is benefit to going to a larger coil for larger pieces. The detector will drive the coil ok so no need for external battery packs. Or are you considering like a very large coil 1m or similar? In that case get a PI, no seriously, winding induction balanced coils for a VLF machine would be a no fun excercise.

http://www.fisherlab.com/hobby/field-tests/GoldBug2FieldTest.pdf

hi ben sorry ive been busy for a few days thanks for the reply. 1mtr wow thats a huge coil i was thinking of a 14 or 18inch  I've got a sd2200v2 but also a gb2 it is good at locating pockets of flood gold in creeks but im amazed at the little depth it gets only a coupple of inch's at most and im running energizer lithium battery's silver one 14 bucks a battery. As for extra depth would it be through fitting a larger external battery pack or would it be through a larger coil but then if you wack a larger coil on wouldn't you need to upgrade the power source to run it? as i said i was just wondering if it could be done and would it be beneficial to gaining extra depth?? thanks ben and hopefully i may find some one that has modified a gb2 as im just curious. thanks  

G'day regamald

I'm guessing it runs in 9 volts, as it has 2x 9volt battries, 2 of em gives you twice as much time as 1 would thats all.

Now you could modify it to run on an external battery supply, you could use a 12volt of some description and regulate it down to around the 9 volts same as the other 2 give you, the only advantage would be you could re charge this larger external battery and get a lot longer run time.

I would not just try and run the detector on a higher voltage without doing some serious research as to what may happen, you don't want to smoke it up ay.

cheers dave

davsgold wrote:G'day regamald

I'm guessing it runs in 9 volts, as it has 2x 9volt battries, 2 of em gives you twice as much time as 1 would thats all.

Now you could modify it to run on an external battery supply, you could use a 12volt of some description and regulate it down to around the 9 volts same as the other 2 give you, the only advantage would be you could re charge this larger external battery and get a lot longer run time.

I would not just try and run the detector on a higher voltage without doing some serious research as to what may happen, you don't want to smoke it up ay.

cheers dave

thanks davsgold ill take that on board might do a bit of research on it tonite thanks

The two batteries run two different parts of the circuitry......i tried this years ago with an old bounty hunter. I wired it up to run off one larger 12v camera battery....it didn't work. For some reason you needed  two separate batteries.?? Not saying the gb2 is the same, but it sounds like it.??
So i ended up using two 12v camera batteries to run my BH red Barron RB5....and i  never used any reverse polarity protection knowing full well id be the only one ever hooking the damn thing up......well!!...i let the smoke out the very first day i took it to a gold field. You guessed it...i hooked the b@stard up the wrong way in my haste to get cracking.  All good tho...i sold it on ebay for more than i payed for it anyway.... 

Careful as she go's....you dont want to let the smoke out of that one. Better off to use 6x1.5v rechargeable battery packs. 9v battery's have very little milliamp hr ratings, and you'd  be better of making up your own battery pack for a better run time and cost saving in the long run.

regamald wrote:Hi im not sure but was toying with the idea has anyone thought of done or could it be done. Fitting an external plug to run a bigger battery pack and would that enable you to run a larger coil or would you gain any extra depth? I know some may think it might be silly or why not just get a pulse induction but i was just wondering its a pretty good machine but i just thought maybe you could increse depth would be good and if being able to run a larger coil would aid you at all? Thanks any considerations and thoughts would be apprectiated

Hi regamald, I had the 14" coil for my Gold Bug 2 but the bloody thing just empties the batteries in a very short time. So the 14" went the way of all things useless.............................Ebay.   Harry

Not only that shiraz,but over the hotter sections of mineralized ground,ground noise will double,as compared to the 10 or 6 inch coils.

Cheers Kon.

Maybe the 10" for the batsh!t at an extra inch or 2 and the 6" for the flysh!t at an inch or two.

Common Harry,you ought to know better than that.The six inch coil on the Gold Bug 2,is more than capable of pulling in flea sh*t,not alone the whoppers of fly sh*t.  

         Cheers Kon.

kon61 wrote:Common Harry,you ought to know better than that.The six inch coil on the Gold Bug 2,is more than capable of pulling in flea sh*t,not alone the whoppers of fly sh*t.  

         Cheers Kon.

I didn't want to praise the GB2 too much Kon, people might think we're selling them. 

Two 9 volt batteries gives a +/- 9v supply rail to the amplifiers, probably regulated down a little to +/-7v or so. If you made a external pack you would still need to be able to provide dual supplies. Without looking inside one you couldn't say for certain if you could run it on +/-12v (say). You would need to open it up and look at the data sheet for each component to see what the voltage limits are.