Mean machine

[ivconic]

I agree.
Although...it would not be a problem to use 3g also. We can try 3g and later BC557c and see differences, if any (by observing signal on scope, by measuring drains...etc..etc)
Ok...TX doubts are solved, i guess.
Now...audio part is next. Relic Hawk has only earphones, Musketerer has earphone jack and speaker 8 ohms... Any difference in output stages? I dont think so, but i will check that also. But i am sure audio output transistor is BSR51, already checked and proved....so...BC517 will do the job also.

[Fred]

Even so...BC548 is NPN !?

good point!,

I alway see bc547/557 548/558 549/559 as equivalent pairs, so i didn´t even look at polarity
will be noce to compare in real world anyway...
Regards,
Fred.

[ivconic]

Uhm... maybe is better, if you have time and an mp3 recorder, to capture that sounds (even better if on soil, during real search) and post here!

Cause I'm going crazy trying to understand the sound... adding spittings etc

So, the transitor issue was solved !? BC857C... fine! Very good!

Kind regards,
Max

Hey Max, it's been a while. Sorry i could'nt done it earlier.
Well...
Recording was done in my living room, right next to pc. Somehow i managed to put all togather and avoid much of interference.
Keep in mind that those recs were made under those conditions and so as i noticed md behavior is a bit different (not to much) than if it was done outdoor on soil.
I collected few items and made mp3 file upon each one. No need to explain more. I give here photos and mp3 files.
Oh...yes...need to explain a bit more. Coil was faced up and steady. I took item and by swinging on 30cm over , cm by cm closed to coil surface. So you will easilly notice differences. First few swings are slow and than goes faster as item reach coil surface.
When you listening cannon ball.mp3 dont be confused about sudden appearance of some background noise, it was damn car passed by my window!!!
Ok... that was all...ask if you have something else to ask...
Regards!

[ivconic]

Oh yes;
i forgot only...most important thing!

Item---------- Disc at 1st half of mp3----- Disc at 2nd half of mp3
************************************************** ******

-1e coin --------------- 4 -------------------------------- 4
-2cm coin ------------- 4 -------------------------------- 4
-fat brass washer --- 4 -------------------------------- 8
-Al disc --------------- 4 -------------------------------- 8
-Fe arrow (rusty) --- 4 -------------------------------- 8
-Al can ---------------- 4 ------------------------------- 8
-Cannon ball ---------- 4 ------------------------------- 8
-Fe key (rusty) ------- 4 ------------------------------- 8
-Silver plate ---------- 4 ------------------------------- 8

You will notice one item from photo is missing in this list. It is nail look like item. It was totally rejected in all cases.

About silver plate mp3; you will hear strange behavior (much different) somewhere from the middle of mp3 file. That is because i turned it lateraly during swinging... Interesting change of behavior, that's why i recorded it in that manner.

[ivconic]

Yes...;
most of the spitting you can hear at Fe key mp3. And most pleasant signal to me (subjective) is reaction on Silver plate..of course!
Possibly at other models too, but at Musketeer there is very significant difference between sound from speaker and sound from earphones.
Nothing can compare to sound from earphones. Sound from speaker is poor comparing to it. That's why is desirable to use earphones as often as
possible. Sound what you can hear in those mp3 files was recorded from speaker. But since mic was very close to Musketeer speaker i am noticing
very good simillarity to sound i used to hear using earphones....So..it is probably due enclosure acoustic and speaker features itself...
Use earphones whenever you can.

[ivconic]

"...About silver plate mp3; you will hear strange behavior (much different) somewhere from the middle of mp3 file. That is because i turned it lateraly during swinging... Interesting change of behavior, that's why i recorded it in that manner.."

This is excellent example to understand better how eddy currents from item surface directly affects signal.

[ivconic]

I forgot to attach this draw. Maybe is not art, but it can illustrate what i ment in previous post...

[Ultimate_Haze]

Great.
So there is some kind of sampler there?
You get pretty good info about the target:size,depth,material!
I just cant wait winter to see this masterpiece busted.No matter that it will be hardly replicated.GP and all.

[WM6]

The BC857 is an SMD with a total power dissipation (Ptot) of 200mW, whereas the BC557 (TO-92F) has a Ptot of 500mW.

Yes Qiaozhi. But dissipation not mean only dissipation. Especially in oscillator stage. Twice and more dissipation mean "twice and more" instability cause of heating drift, more noise added to circuit (more parasitic frequencies / stronger harmonics to basic signal) etc. SMD 857 was used by reason and TO-92 BC557 cannot be good replacement, if one follow to hold primary characteristic of detector.

Hi Ivconic I cannot recognize this Colt anymore. Congratulation. And coil set are really fantastic. This is a unique combination. Happy hunting!

[Qiaozhi]

Yes Qiaozhi. But dissipation not mean only dissipation. Especially in oscillator stage. Twice and more dissipation mean "twice and more" instability cause of heating drift, more noise added to circuit (more parasitic frequencies / stronger harmonics to basic signal) etc. SMD 857 was used by reason and TO-92 BC557 cannot be good replacement, if one follow to hold primary characteristic of detector.

The power dissipation of 500mW for the BC557 does not mean that it will always dissipate that amount of power. This is the total power that the transistor can handle. If the 857 is replaced with a 557 it will only dissipate 200mW. Therefore it is a suitable replacement. There will be no significant increase in instability, heating or noise for this circuit.

[WM6]

Therefore it is a suitable replacement.

Suitable to repeat Relic Hawk "reverse engineering" success. Good luck.

[Qiaozhi]

Suitable to repeat Relic Hawk "reverse engineering" success. Good luck.

You will have ask those who were involved in reverse-engineering the Relic Hawk.

[ivconic]

More i think - more am convinced that there are some major flaw in what we done reversing Relic Hawk. It is not simple mismatch like wrong component value or something. It is most probably some huge flaw. For example minus rail switched with gnd at some point or simillar. Why? Looking now at Musketeer i see pretty "tolerant" design - quite oposite than we thought in the past!
Machine is so stabille, i cant explain! It is not about coil resistances at all. I played a bit with some handmade coils. I didnt gained some extra results, but oscillator never refused to run. It runs on resistances from 1 to 6 ohms! So doubts about to low or to high resistances are not real.
Handmade coil for Caesar (serbian most wanted) runs pretty descent with Musketeer! Rememeber? 75 windings, wire 0.45mm for TX and 170/0.22 for RX.
DD 27cm coil.
Balancing is not easy as on TGSL. I havent measured residual voltage yet at original coils, i just played a bit with TX and RX coils prepared for Caesar.
So far that much. Will continue. Weather here is worse and worse, day by day - meaning i will be captured more in my workshop!
I will inform you when something achieved..

[N@SKO]

Hi Ivconic!
Do you know how the resistance of the transformer sound?
10x!!!!

[Sean_Goddard]

Guys from Minelab probably made strategic marketing move and predicted newer models (only guessing) so they left everything inside same and changed only outlook of models. What was the reason? I really don't know.

Same old Lamebin, NEW MONEY OLD ROPE and the fact that a LOT of detectorists are, shall I say it, GULLIBLE believing that a "new" machine will make the difference. Of course WE all know better on this forum don't we?

Tesoro started this and are STILL doing it.

The NEW Sovereign, with it's ground trac...ERM same micro and same code if you pull it from the ROM. Worse still is the fact that Limeban told us, when the Sov first appeared that it could "See through" bad ground and the like, it's plain for ALL to see in their early advertising yet now they would have us believe that it needs this new fangled system.

WHAT BULLSH*T!!

OK Milenabs marketing department is one of the best out there, but as Lebanim have were sold by Halcro a few months back I am questioning their viability as a company, in fact a friend who lives in Oz told me that her company had been sent a LOT of CV's from Engineers desperate to flee the ship, could this mean that ML are in financial trouble?

The new Pulse Devil NEMESIS will be the final nail in their coffin. Candy is out of ideas and on more than one occasion attempts have been made to STEAL PD prototypes from Dave Emery's house. How low will guys sink? I could tell you but the US and Oz authorities are still investigating the attempted thefts .

HOWEVER, ALL the above said, the Musketeer is an AWESOME machine and IF you adjust the pots right, it is the deepest VLF you can get, if a little "on the edge". Has anyone traced the schematic yet?