SD2000 Front end improvement #2

[Woody.au]

Another improvement to the SD2000 to make it more sensitive is to change the 2 P and N channel fets on the input of the detector.

Change VH2410L to TN2404KL This fet has a better voltage rating, improved threshold is half the RDS on and is faster. It also has very low Capacitance.

Change ZVP4105 to SI1021R, this device is half the RDS on and has better over all specs.

The attached pic is where the 2 fets live on the board.

[Elie]

I just realized that you do NOT know what you are talking about. You are actually making the detector more sensitive by removing all of that gunk from the board!

[J_Player]

"Gunk" meaning paint? I thought this paint was electronically inert, and has no influence on the electrical properties or frequency components in the circuitry. Am I wrong?

Best wishes,
J_P

[Woody.au]

The white paint is not conductive, except when you soak it in White spirits as I found out.

[Sean_Goddard]

Anyone would think LameBin had something "special" (other than their needs) to hide. I thought we all knew that their marketting is based on paid patsies who spout off how good their products are, and psudo truths in their adverts.

they even claim to make the best audio hi-fi amps in the world. ROFLMAO what losers.

[JC1]

Not so sure

Hi Goddard,

Having reviewed Dr. Candy's audio

designs as well as the metal detectors

I have come to the conclusion that

he is a pretty good engineer.

Perfect No, and I don't worship nobody,

but still have to give the guy some credit

from an engineering view point.

Now marketing can be a bit aggressive

I agree, and all these "new models" everybody

keeps coming out with that get the old models

shed and have to have the new one.

If people would stick with one long enough to

really get to know it they might have surprizing

success. Most this "new stuff" is just overfiltered

to make it less "noisey", but the treasure can be

in those little noises.

[Woody.au]

What is amazing is that by modifying the older units with current up to date components they can work as well as the newer detectors. My modded SD2000 blows the GP series of machines away on depth capabillities.

[Sean_Goddard]

Strangely enough JC1, I agre with you, but when they PAY people to spout rhetoric about how good their products are it's more than a little sad. Granted.. Nice if you can get it, but a really good product sells itself.

I've seen a guy with a Silver Sabre find MORE than 20 Lamebin owners combined. What Limeban machines do (Explorer, Quattro) is make a bad detectorist average.

I used a Nexus the other day, and quite frankly it ran rings around ANYTHING Nabmile make.

OK Bruce Candy is a clever guy, but he's burned out now, out of ideas, by his own admission. I have a friend who lives in Australia, and she said during a recent recruitment drive by her company they interviewed no less than THREE electronics Engineers from Malenib. When asked why they wanted to leave (She knew I would want to know this) the cited, a restrictive work environment, with constant pressure, and the fact that only one guy (candy) was ever given credit for nw ideas and he had run out a LONG time ago. make of that what you will, but I dont think we'll see anything new from Lambine anytime soon.

[Carl-NC]

Whether folks like Minelab as a company, or Candy as a person; whether you agree or not with their advertising claims or their pricing policies; whether or not people are paid to hype the products; Minelab makes some pretty darned good detectors. It seems they remain virtually unchallenged in the Australian gold fields, so they must be doing something a whole lot better than anyone else.

My philosophy is, if ya don't like Minelab, then don't buy a Minelab. Easy as that.

- Carl

[Sean_Goddard]

Until the Pulse Devil gets over there that is. Then...We'll see.

I spoke to Dave Emery last night and I can't wait. It hits the UK market VERY soon, my name is on one.

Over the past year or two, Dave has sent me schematics and explanations of how thi machine works, and I have found it is RADICALLY different in it's operation to anything available at the moment, and I didn't get paid for that, I just have faith in someone who sells his products based on facts and truth rather than lies and hype.

Six years ago, the Sovereign didn't need ground balance because it can "See through the mineralisation". Now?? We have the Sovereign GT which needs it, same machine, it's just that ML think we have forgotten about what they said 6 years ago. They also said Multifrequency was "The future. See what others have been missing". Then they hype up VFLEX on the Xterra as being somthing new and fantastic. New money old rope they should be called.

Now PLEASE don't get me wrong, they have done an excellent job, and I commend them, but I disagree with the way they have gone about it.

BTW I have heard it said that they tried to STEAL the Pulse Devil prototype. If they understood the technology that well, surely they would have worked it out for themselves by now? Looking at the ML patents and the mathematics quoted therein, it seems that what Bruce Candy has done is hit upon a method of metal detection by accident, as the math seems makes no sense at all, and indeed has little or no relevance to what the rest of the patent subject matter covers.

BTW I bought ML machines and the Explorer SUX, just for rubbish build quality. I have and keep the Sovereign XS2 because it is the BEST Beach machine on the planet. If the PD is better, the Sov WILL go.

[Wirechief]

I am an authorized Minelab dealer in West Texas and had a brief e-mail exchange with Bruce when I sent an e-mail to him about the Minelab PI machines. He told me that the next 10 years will bring in some really cool technologies in the metal detecting field. I will leave it at that.

John Tomlinson,CET
John's Detectors

[Sean_Goddard]

Ah, yes I know, BUT ML were still 15 years behind my TRUE multifrequency design, and I proposed using DSP in detectors before Garrett did in their GTi series.

I have documentary proof that I gave them this idea way back in the 80's. I even called the machine the Garrett Digidec GTi. I never got paid for my idea. More fool me for not taking out patents for using micros in detectors too, I'd be a rich(er) man today if I'd done so, but hey, that's life.

Watch the PD sales, I think ML will be wondering what happened. For a start a PI is ALWAYS going to be deeper than any VLF type machine. Don't forget the Pulse Devil was developed by ONE MAN, not a large corporation with a huge budget.

ALL things are possible if you throw enough money or manpower at it, just look at Winston Churchill's methods of fighting wars to see that, and today, business IS war, and vice versa (according to the US military).

I also believe that 95% of todays so called "detector designers" are dinosaurs, stuck in the analogue world because they just can't cut it in the REAL world of the digital Revolution. I'm not alone in this train of thought.

[Qiaozhi]

Looking at the ML patents and the mathematics quoted therein, it seems that what Bruce Candy has done is hit upon a method of metal detection by accident, as the math seems makes no sense at all, and indeed has little or no relevance to what the rest of the patent subject matter covers.

Hi Sean,
Do you have this patent, and is it possible to post it here or on tempdir?

[Wirechief]

Hi Sean, yes the PD is going to be interesting once it hits the market as long as it does what Dave says it will do. I always wish anyone success when coming out with an invention. It is not an easy feat to come up with a new device and make it to market. Those that make things are the ones that make money, usually. I just wish I lived near enough to a goldfield to put the PI stuff to use. Ok Sean take care and God Bless.

John Tomlinson,CET
John's Detectors

[Sean_Goddard]

Try these two,
http://geotech.thunting.com/pages/me.../US4942360.pdf

This one is, from what I have seen of ML schematics (sorry cannot say where I saw them) is the Explorer;

http://geotech.thunting.com/pages/me.../US5506506.pdf

IF you can get around the padding, the math and explanation of the method of operation make little or no sense, UNLESS I'm missing somethng, which is entirely possible. BUT... The diagrams though, make perfect sense which is a little confusing.

Finally;
http://geotech.thunting.com/pages/me.../US5576624.pdf