TESORO GOLDEN SABRE

[tiktak]

hi

Thanks.
My idea is that if I reach 22 cm for 1 euro coin this mean that my coil is good and olny have to change TL082 with 353.
But Ivconic talk about 1cm coin this mean DIME!!!!!
Much smaller than 1 euro coin!
Please explain.
Thanks

[Max]

Thanks.
My idea is that if I reach 22 cm for 1 euro coin this mean that my coil is good and olny have to change TL082 with 353.
But Ivconic talk about 1cm coin this mean DIME!!!!!
Much smaller than 1 euro coin!
Please explain.
Thanks

Hi,
yes, but what about coil used. You have to ask Ivconic.

Flux chaining is "proportional" to coil diameter, if you use e.g. 28cm diameter you get some more depth.

1cm coin is very small thing and require a very good coil to detect at big distance.

Kind regards,
Max

[tiktak]

hi

Hi,
Max.
I just make new coil DD22 with wire from DD28!
But the resistance is almost the same 18,8!
What I am doing wrong?
The turns are 162 for both windings.
I am gonna test and tell you the results.


Ivconic can you tell us is the depth 38 cm in air with 28DD coil for dime?/what you understand buy 1cm coin?/!

[Qiaozhi]

PCB Cleaner

Hi tiktak,

This is what you need to look for at the electronics shop -> http://www.maplin.co.uk/module.aspx?...=27521&doy=9m8

[tiktak]

hi

Hi,
Max.
No differance,even lorst.Less depth.Not shielded,but ......
I will shield tomorrow and tell you results!
Around 18cm for 1 euro coin POOR.....

[tiktak]

Hi

interesting is that nelsons resistance were too high,and my is too low!
Why?
How you meashure the pik-to-pik voltage?
Is TEA2262 (STM)
category: MISCELLANEOUS I.C.'S
decription: SMPS CONTROLLER

Same thing like TLC2262?
Thanks

[nelson]

MINE WAS 13 CMS.

I STILL DON´T HAVE THE TIME TO PLAY WITH MY NEW COIL.
REGARDS
NELSON

Nelson,
What is this distance that you use/look at the picture in my previous post!/for your DD 22 coil?
How is this new coil that you made preformance?
Tks

[Max]

interesting is that nelsons resistance were too high,and my is too low!
Why?
How you meashure the pik-to-pik voltage?
Is TEA2262 (STM)
category: MISCELLANEOUS I.C.'S
decription: SMPS CONTROLLER

Same thing like TLC2262?
Thanks

Hi tiktak,
about coil 18cm for 1eur is low. But maybe problem is not at coil, maybe some mistake in circuit.
Also you have to exchange rx leads at each test you made... cause if no right phase you'll lose performances.
I swear, that my GS detector detect in air 1eur coin at 27cm, with DD22 without any tuning... even geb in mid position! I had no time for testing and tuning at best now. Coil is the same of bandidoII, no mods., nothing.
So try swap rx leads, sometimes there is the problem; if not you maybe have some wrong thing on PCB.
About TEA2262 is not same of TLC2262, it's another thing (used in TV sets and old VCR, switching power supplies).

If can't find TLC2262 you maybe could find TS27L2 or TS27M2 that are not so well but have much less noise than TL062.

Kind regards,
Max

[Max]

LF353 REPLACEMENTS

Hi all,
I've not tested but from a research I've made seems that a good solution could be :

AD712 from analog devices

I haven't it so can't try, but think is even better than LF353 there.

Another thing that would be even better could be OPA2604 (TI).

If someone here have them please try, then post the results.

Kind regards,
Max

[tiktak]

Hi,

I think that the probleme is in coil!
Can you tell me what you think for NE5532 it should be very good to be used according to data that I have.
Low noise....

[tiktak]

Hi

Look at this:

Had anyone ever compare the electrical charateristic of TL072 to TLC2262?
What is the thing make 2262 produce lower noise ?

other than 072, What other chip is comparable to 2262?






Re: TL072 compares TLC2262 « Reply #1 on: July 05, 2007, 07:01:58 AM »

At 9v there will be no difference, but at + & - 15v possibly, but probably not losing any sleep over!



I think that there are no mistakes when I check!
I give it attention.
May be flux as you say,but I doubt!I will try to wash with acetone!
Thanks

[tiktak]

Hi

http://www.diystompboxes.com/smfforu...8954.msg461001

If you have NE5532 please try to change with 353 and see the differance.

And this 566 is inposible to be found!

[nelson]

Hi tiktak and Max.
Tiktak, my last 22 coil, is the same made by Max and now is giving me the correct values on inductance and resistance. So this weekend i ll play chanhing leads connections to get rigth on phase.
I also had a terrible mistake, when i discover that my rx cap value was wrong. This was around 10 pF and the correct value needed is 15nF, so i replaced it and the detector is working good by now and only need little work to go has Ivconic and Max said.
So i recomend you, to take the time to do all advices that Max is telling you. The main obstacle was passed, that is building the detector and make it work. Now you need to find were is the fault to correct it.

Regards

Nelson

Hi tiktak,
about coil 18cm for 1eur is low. But maybe problem is not at coil, maybe some mistake in circuit.
Also you have to exchange rx leads at each test you made... cause if no right phase you'll lose performances.
I swear, that my GS detector detect in air 1eur coin at 27cm, with DD22 without any tuning... even geb in mid position! I had no time for testing and tuning at best now. Coil is the same of bandidoII, no mods., nothing.
So try swap rx leads, sometimes there is the problem; if not you maybe have some wrong thing on PCB.
About TEA2262 is not same of TLC2262, it's another thing (used in TV sets and old VCR, switching power supplies).

If can't find TLC2262 you maybe could find TS27L2 or TS27M2 that are not so well but have much less noise than TL062.

Kind regards,
Max

[Max]

http://www.diystompboxes.com/smfforu...8954.msg461001

If you have NE5532 please try to change with 353 and see the differance.

And this 566 is inposible to be found!

Hi Nelson,
I've some 50 ne5532... tested there and it's not good (for me) as replacement this time, at least for my taste: lose many performances... and TL072 is better than it this time.

I have NE5532 originals by Philips.

If you have dubts, buy one and see with your eyes.
Very easy to find and cheap.

What I'm talking about is not just related to noise at preamp. but have more to do with input stage of op. amp. that is a very tipical fingerprint expecially for jfet inputs op. amp.

That's why I've indicated the analog and TI replacements.

I've tested 566 circuit (the one you can see in Sasho's thread, with bc547 and bc557, but arrows are in wrong places... anyway) I'm not so happy of results... get sound and VCO operations, of course, but sound it's not loud as I want. Think that a TBA820M could solve any problem of loudness.

Yes, LM566 is almost impossible to find. My new 3 pieces were from an old 80's stock. I'm sure somewhere is possible to find it from old stocks unselled products, but it's a hard challenge not for anyone to get this stuff.

Best regards,
Max

[Max]

Hi,
About equiv. noise voltage vs freq typ (at 1KHz):
(and not considering load...)

LF353 : 16nV/sqrt{Hz} (data from National's datasheet)
TL062 CN : 42nV/sqrt{Hz} (data from STmicro's database)
TL072 CN : 15nV/sqrt{Hz} (data from STmicro's database)
TLC2262 CP: 12nV/sqrt{Hz} (data from TI's database)
NE5532 : 5 nV/sqrt{Hz} (data from Philips' datasheet)

So seems that 5532 beat all the others... well NO. On equiv. noise YES, but there are other things to keep in mind when playing with an RX coil signal.
This is not a microphone or guitar preamp...

So one have to consider other things too.

Kind regards,
Max