COBRA II. what we know about it.

[kt315]

hi all.
pls write here what you think about COBRA. can anyone give a list of components? I see quartzed generator and probably the schematic is similar to Fisher 1266 on it.

yours

[kt315]

can anybody give a full IC's list of COBRA II? some are not visible.

[amtech2005]

cobra II. what we know about it.

Hello KT315. I am looking forward to a schematic and coil information also ! ! ! Cobra II was a Great machine , deep-seeking from late 1980's. Reminds me a little of the bandido II . Thank-You for posting the above information. Eugene [email protected]

[kt315]

I re-copied these I hope useful replies from Metal Detecting Equipment, folks can speedy drive in the subject for.


Posted by JB(MS) on 12/10/2005, 9:59 pm, in reply to "What is a Cobra ll and"

There have been two Cobra II's, both made by Discovery and both sold by Kelleyco as a house brand. The first Cobra II, in 1995 or 96, was a base Treasure Baron with an added Notch feature, the same as the A&S Special Baron. The current Cobra II is the Millennium II Cointrax Baron with the new chip George programmed, whether or not they have the last version of the chip is open to question..... JB





Posted by Joe in Austin on 12/10/2005, 9:54 pm, in reply to "What is a Cobra ll and"


Hey BJ:

A Cobra II is a Discovery Treasure Baron variant with built-in notch, marketed by Kellyco... maybe 10 years ago or so. Starting to lose track of the years...

It's a bit of a sleeper because the Kellyco brand name throws people off the trail, not that many people know about the Discovery detectors anyway, but that is improving.

It is a heavy sucker but goes deep. It has a two tone notch system and an iron accept setting to prevent masking (or find iron, if that's what you're looking for).

You can set the notch knob at, say, nickel accept and everything below nickel will be low tone and everything above will be high tone.

I like it because it lets you hear all the iron in the ground while picking out the non-ferrous targets by tone.

The Cobra II is a very effective metal detecting machine--probably better than I'm making it sound with this description...

If you search the archives of this list for "Cobra II" or "A&S Baron" or "A&S Special" (A&S sold a similarly configured Baron for a number of years) you will find more user comments on this unit.

I like to think of mine as my "Kobra II" since it came from the Big "K"! "Cobra" is sort of an in-store house brand name for Kellyco. They have a machine now called the "Cobra Beach Hunter" or something like that. Joe

[amtech2005]

cobra II. What we know about it.

To KT315, Any information yet on cobra II , Please e-mail me, Have a Great Christmas and prosporous New year, 2006 ! ! ! Thank- You for all the great information you contribute to this forum. Eugene [email protected]

[willy]

The Cobra II with the 2 coils (one black on the bottom) is mine. It's one hell of a detector. I did head to head tests of it against a GTI 1500, Excalibur, and Sov. XS pro. With the 8" coil on the Cobra it beat the pants off the minelabs & matched the GTI.. while finding smaller targets. It's extremely sensitive to low conductors like gold & lead. Mine is modded with, from top left to right: 20 turn GB, Vsat, threshold. It also has 2 all metal modes: stock (very slow autotune) and Vsat. ..Willy.

[Valchev]

Cobra II is a great detector. I use elements from the Cobras schematic in my detectors, and make it and sale from many years. Equivalent operational amplifiers are NE5534 -input, TL062, TL064. The Cobra is rather different to Bandido II and Fisher 1266 . The generator is not quartzed, but is very sophisticated, it is to can be made with a little coils.

[Sean_Goddard]

Anyone have a diagram of any of these machines (just for reference of course) . Can you email it to me please?

[rumensat]

very nice PCboard KT315 , can You upload front and back side of this PCB?

[kt315]

sorry rumensat. it is not mine. I did take photo off another forum. PCB with an update by Mr. Bill. as I yet remember the photo was accompanied his comment (update advertising).

[kt315]

-01-2006, 07:06 PM
willy vbmenu_register("postmenu_46240", true);
Junior Member
Join Date: Dec 2005
Location: B.C. Canada
Posts: 24



Might ruffle a few feathers, but here it goes. I've had quite a few detectors over the years and have even done head-to-head in-ground comparisons. The ground where I hunt is probably some of the worst and is often loaded with hotrocks. Lately, I've been reduced to just one detector and that's the X70. Compared to other detectors I've used/tested (Sov., GTI's, MXT, Cobra II, CZ6a, various Tesoros) it matches or exceeds the others in depth and definitely has the edge in sensitivity re. small targets. Took it up the Tulameen to see how it would do as a prospecting unit (with the HF 5x10" DD coil) and was pleasantly surprised. This area is soooo loaded with hotrocks that a number of local residents had advised me not to even bother using a VLF. Indeed, other VLF's I've used there would signal like crazy on the (literally) millions of hotrocks to a degree that made them almost unuseable. The MXT, with 5x10" DD, could be used.. but it also had problems. The X70 was surprisingly quiet and hotrocks that did sound off could be quickly ID'ed by switching to disc. mode. In some respects, it did better than my PI insofar as some of the hotrocks would give a good solid signal that even advancing the delay wouldn't eliminate. I dug a number of them up to check and .. yup, you guessed it, hotrocks. I would then do a comparison with the X70 and, while signalling strongly in AM, would ID down in the hotrock/iron range in disc. mode. The target would also have a broader "footprint". I'll be going out in a few days to play around on some claims and will be able to expand a bit on the subject afterwards. So far though, it seems to be a pretty damn good detector. As an aside, one of the most successful TH'rs that I've known swung an old Garrett Gold Stinger and, when that finally bit the biscuit, an older White's 4900d. ...Willy.


hi, Willy. I hope you read me now. and my request to you. can you give me a Part List on Cobra or maybe good photos of the board?
second, can anyone say what quartz's frequency is? I read '2700' on it, but what is it in Hz?
sorry, I get much requests on my e-mail, but I have still not any info on COBRA.

[Sean_Goddard]

That's not a quartz anything I'm afraid, it's a polystyrene capacitor of 2700pF.

I suspect the other chip is an LM357 by the looks of it.

STILL looking for any diagrams of these machines, there's a certain part of ot I'm VERY intrigued by, any offers. PAYS cash if need be!!

[Qiaozhi]

That's not a quartz anything I'm afraid, it's a polystyrene capacitor of 2700pF.

I suspect the other chip is an LM357 by the looks of it.

STILL looking for any diagrams of these machines, there's a certain part of ot I'm VERY intrigued by, any offers. PAYS cash if need be!!

Yep - it's a 2700pF polystyrene capacitor alright!
Why would anyone think this was a crystal?? Maybe a visit to the opticians is needed.

[kt315]

thanks lots! I am surprised why they did not use ordinary ceramic. maybe there is a need in stability of the generator... this optic is the complete science
regards.

[Qiaozhi]

thanks lots! I am surprised why they did not use ordinary ceramic. maybe there is a need in stability of the generator... this optic is the complete science
regards.

It must be for their stability and tight tolerance. Although in practice it probably wouldn't make much difference if it was replaced with a ceramic.