RELIC HAWK

[robopatt]

I have tested with good coil.A little bit better.
But not the result that we search for.
Now its time to see how others units will work.
Its look like all functions are there but in same time when target detected close to coil only constant sound in all modes.Sens is TOO low.
And frequency is 6.0kHz with original coil.So still a lot of work there.
Try to use TL272 and 271 but this only make the things worst.
This should be matched very well.

[porkluvr]

Look this shot. It is so clear those two are BC547 and BC557...
Third one ( and probably most important one) is smt...and i can not see any label...hmmm...

Ivconic, if you (or anyone) get the chance please tell the SMD code on the unknown transistor. Most SMD code directories are not complete (and sometimes ambiguous) so there's no guaranteed lookup, but there is a chance that Marsport.org or somebody will have it listed.

If that doesn't work, manufacturers' data sheets usually list the SMD codes that are printed on their devices. There is a chance somebody will run across it in a product data sheet.

NXP BC807-40 is "5Cp". Did I get lucky? (fat chance)

[porkluvr]

No!
MAKE PROPER COIL!
DONT WASTE TIME WITH BAD COIL!
DONT CONFUSE YOURSELF MORE!

Hmmm. GOOD ADVICE. How is throwing different opamps at the problem going to solve it?

Robopatt, two important questions:
Did you measure the capacitor C?
Did you measure the coil L?

One or the other or some combination of the two is way off if you have 5900. I don't mean just a little.
You are shooting yourself in the foot.

[robopatt]

OK.
I told you before inductance is 1mH.
And which capacitator you want me to measure?
Did you measure the capacitor C?
I still havent added yet capacitators.
Just some tests.

[porkluvr]

OK.
I told you before inductance is 1mH.
And which capacitator you want me to measure?
Did you measure the capacitor C?
I still havent added yet capacitators.
Just some tests.

This is nonsense. You did not answer my question. I don't have time for this.

[Unregistered]

This is nonsense. You did not answer my question. I don't have time for this.

ROBOPATT OR TIKTAK?????

[Unregistered]

This is nonsense. You did not answer my question. I don't have time for this.

IS IT ROBOPATT OR TIKTAK?????

[robopatt]

I now who I am and post with my name.But why you don register or use your name here and then make funny conclusions.I am not taking your words serious.
And not offend but I can TIKTAK your mother!!!
If my skills are not on your level you cant just spit worlds.
Simple description would do the job just fine.Or just keep acting silly.

[Unregistered]

Guest

I now who I am and post with my name.But why you don register or use your name here and then make funny conclusions.I am not taking your words serious.
And not offend but I can TIKTAK your mother!!!
If my skills are not on your level you cant just spit worlds.
Simple description would do the job just fine.Or just keep acting silly.

Yesterday, 10:28 PM
robopatt
Junior Member Join Date: Mar 2009
Posts: 26

TRS coil

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I need larger coil for Tesoro Royal Sabre.
Have old DD17,5 this is 8'' I think.Its widescan DD.
I wanna make lets say 27,30 DD.
The strange thing is that all pins on coil buxe make contact when tested???
How is this wired actualy?
This original one have such datas 5,71 mH /20,5 ohms and 5,60mH/20,3 ohms.

02-20-2009, 10:00 PM
tiktak
Guru Join Date: Jul 2007
Posts: 516

Hi,

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Hi,
Ectremly small coil 8''=17,5cmDD.
Weight is 319gr.The sound is diferent from TGS but and coils are.
Can somebody tell me is that on molzars picture royal sabre or royal sabre plus?
What are diferances?
Thanks
p.s.So now I am very happy from TGS and TGSL results!
Hahah

1 inch = 2,54 centimeter 8x 2.54=20.32 cm

[porkluvr]

I'll try again.
Robopatt,
I don't want to appear hostile, but the information you gave seems illogical, and yet you seem so sure of yourself. That's frustrating.

Then tank is the parallel LC network including the TX coil. Anybody wanting to assist you would need to know the values of your tank capacitor and tank inductor. Those are the frequency determining devices in the transmit circuit.
Using 1uF and 1mH, to calculate frequency:
F=1/(2pi(sqrt(LC)))=5000

Working backwords from that formula, (or having related formulas on hand, which is much easier) something is bad wrong if you have 6000. You would either need a 700uH coil or a 700nF capacitor to get there, or those two components could both be half that bad. It is not a trivial error, and the detector will very likely not work right until that is fixed.

If you have not measured your coil then you should not bluntly state that it is 1mH. You can't know with any degree of accuracy without measuring, or unless you have measured another one exactly like it. Maybe I'm wrong, but it seems to me that if you have a means to measure the tx coil and the tx frequency, then you would probably also have a means to measure the capacitor because I believe capacitance meters are more common than inductance meters. But, there's no guarantee.

I asked if you measured the capacitor. Forgive me for not being more specific, but I assumed you would know which capacitor I was referring to. I thought it would be obvious that I wanted to know about the capacitor that determines frequency. It should be 1uF (+/- 5%), assuming 5% tolerance.

Have you measured the 1uF parallel capacitor in the TX tank?
Have you measured the TX coil, or did you assume that you wound it correctly?

Five percent error in your output frequency may be OK, but you have almost 20% error That is not good.

[ivconic]

Ivconic, if you (or anyone) get the chance please tell the SMD code on the unknown transistor. Most SMD code directories are not complete (and sometimes ambiguous) so there's no guaranteed lookup, but there is a chance that Marsport.org or somebody will have it listed.

If that doesn't work, manufacturers' data sheets usually list the SMD codes that are printed on their devices. There is a chance somebody will run across it in a product data sheet.

NXP BC807-40 is "5Cp". Did I get lucky? (fat chance)

Yes i understand you. But at few devices i saw so far, there wasn't any label... Just blank!?
Right now i don't have any device at me. Hopefully i will get one soon.

[porkluvr]

Hopefully i will get one soon.

It's not important but it would satisfy curiosity "exactly" what is that part.
I know a few things what it aint!

[porkluvr]

I have tested with good coil.A little bit better.
...frequency is 6.0kHz with original coil..

Another possible explanation for incorrect frequency reading: if TX coil and capacitor are very close to optimum values there could be something else causing waveform jitter with a frequency component being picked up by your freq meter. If you have a scope you should be able to see it.

(Scope, what's that?) Yeah, me too.

[Fred]

....(Scope, what's that?) Yeah, me too.

This is a scope:



with this you can see small jitter in a waveform from far away

[robopatt]

Porkluvr,

Have you measured the 1uF parallel capacitor in the TX tank?
No I haven't.Just put one there.Small yellow ceramic with 105 label.
I will try change it.

Have you measured the TX coil, or did you assume that you wound it correctly?
Yes I have measured this and it shows 1mH.

Sorry I don't have a scope.Hope get one soon.