TESORO GOLDEN SABRE

[Waikiki_Sweep]

3200 ft (more than 1 km.) of AWG 30 for $22.84 + $5 shipping

here you can buy but ask for shipping to your country
http://www.spulen.com/shop/index.php?cPath=72_27

i bought last week a 1kg 0,25 spool ( 2200 meters) for 22 euro or so
http://www.spulen.com/shop/product_i...oducts_id=1423

better is this you can heat it and it melts togehter
http://www.spulen.com/shop/product_i...oducts_id=1434

Looks shipping is toooo expensive:

Delivery within Europe: 17,85 EUR independent of weight or quantity (fixed-rate charges).
Delivery outside Europe: 30,00 EUR independent of weight or quantity (fixed-rate charges).

I have purchased 3200 ft (more than 1 km.) of AWG 30 for $22.84 + $5 shipping
here:

http://shop.ebay.com/merchant/tech-f...Magnet+Wire+30

Purchased two days ago. Awaiting for delivery now.

With one kilometer if wire there is a good chance to test all types of coils:
DD, OO, Bigfoot 3.5" X 18" (TX-rectangle, RX-"8" shape). I hope Bigfoot will work for TGSL with proper inductances because I need discriminating metal detector that will cover big areas of dry sand quick.
Also I hope to make very light fiberglass coil and fishing rod stem becase I am tired of heavy coil on my ACE-250. (Very good and quick detector. I am spending 5-6 hours running with it every day. But small coil and it is too heavy to sweep fast) I will try to chage timing for TGSL filters to make it much more faster. Speed is more important here than depth because all stuff gone from the beach every evening till it still warm .
My last experiments with Surf PI were successful. I have made streamline 5 mm. thick fiberglass coil and thin fiberglass stem from fishing spear that can be moved in water 3 times faster than original Whites Surf PI and may-be 5-6 times faster (less muscle tension) than Whites Surf PI Dualfield or Minelab Excalibur. Resistance to movement in water is the most important quality that every brand manufacturer still neglecting .

Also I have found inexpensive digital LC meter ($29 with free shipping in US) that is necessary to measure inductance of coils:

http://www.amazon.com/Multimeter-Res...sbs_01_04_t_lh

Thanks everybody!

[juka vk]

Also I have found inexpensive digital LC meter ($29 with free shipping in US) that is necessary to measure inductance of coils:

http://www.amazon.com/Multimeter-Res...sbs_01_04_t_lh

Thanks everybody!

I bought this few day ago and it looks pretty good. http://cgi.ebay.com/LCR-RCL-INDUCTAN...item3a6692dc0c

[der_fisherman]

I bought this few day ago and it looks pretty good. http://cgi.ebay.com/LCR-RCL-INDUCTAN...item3a6692dc0c

If price is really important, Silverdog in the UK sells a cheap one, explicitly for MD coils.
Look here:-
http://www.silverdog.co.uk/
Click on the little dog and check the first page 10 ponds Sterling, what is that $15 or so?

[juka vk]

Hi, i have problem with winding coils. I made 107 windings and i get 5,45 mH, but it need to be 6,3mH. What should i do ?? Help please !!!!

[der_fisherman]

a) If you haven't cut the wire (if you have cut the wire goto b), add a few turns, bare a bit back, measure. Keep adding turns till you get the right value.

b) Personally, I doubt if it will matter much.......try it as it is.

[simonbaker]

Hi, i have problem with winding coils. I made 107 windings and i get 5,45 mH, but it need to be 6,3mH. What should i do ?? Help please !!!!

Wrap it tightly with thread or tape, it will increase the inductance. Or keep winding.

-SB

[juka vk]

a) If you haven't cut the wire (if you have cut the wire goto b), add a few turns, bare a bit back, measure. Keep adding turns till you get the right value.

b) Personally, I doubt if it will matter much.......try it as it is.

i didn't cut wire because i wanted to add more turns, but first i wanted to ask
thank you guys

..... resistance is not important, only inductance ?

[maikl]

i didn't cut wire because i wanted to add more turns, but first i wanted to ask
thank you guys

..... resistance is not important, only inductance ?

It is important to resistance, because it selects a certain thickness wire.

[juka vk]

now i finished coil and inductance is 6.52~6,53mH (it needs to be 6,50) is this probelm? I can remove insulating tape and Al foil and remove one or two turns, IF it is necessary, but i think that that can be measurement error

Before putting AL tape inductance was 6,50mH.

[dfbowers]

now i finished coil and inductance is 6.52~6,53mH (it needs to be 6,50) is this probelm? I can remove insulating tape and Al foil and remove one or two turns, IF it is necessary, but i think that that can be measurement error

Before putting AL tape inductance was 6,50mH.

I don't think that will be much of a problem. Your Tx coil is likely to change by that much as well once sheilds are installed. If inductances are off by too much you will be unable to GB to ferrite in the A.M. mode.

[der_fisherman]

now i finished coil and inductance is 6.52~6,53mH (it needs to be 6,50) is this probelm? I can remove insulating tape and Al foil and remove one or two turns, IF it is necessary, but i think that that can be measurement error

Before putting AL tape inductance was 6,50mH.

AS DFB said, it shouldn't matter, you are REALLY close to the correct figure.

[dfbowers]

TGSL - More coil options!

I just had to try to get the coil off of my Cibola to work on the TGSL Circuit. I have been finding that doing things with just one hand has some definite challenges but finally success!

Ivconic, you were right. The coil is close enough to the Minelab coil that it works perfectly!! (on the work bench at least). GB and disc work correctly. I have not done any detection range testing but will post something up as soon as I can get my carousel hooked up again. I suspect that it will be similar to the TGSL coil.

I need to figure out how the sheild is grounded to post the correct pinout, but will do that soon as well. Again, I am challenged at the moment with posting schematics, etc..

Now for the bad part. I could not get the "Minelab" oscillator section to work correctly on breadboard, but was able to piggyback the oscillator from the SMW directly to the TGSL. I just had to cut one of the leads to the 2k2 resistor (R1) and change C6 below to 330n and I ran V- to ground instead. Audio is a little lower so might want to cut or relocate D5. Oscillator frequency is in the mid 8kHz range and varies depending on the amplitude setting. I suspect no different from the oscillator section on the Minelab coil version of the IGSL.

More to come..

Don

[der_fisherman]

Resistance is not as important as the inductance of the coil, the frequency of a Colpitts Oscillator is given by this formulae:-

You will notice that resistance does not form part of the equation, the capacitors and the inductance does.....

I hope this explains my recent post better.

You can look this up here:-

http://en.wikipedia.org/wiki/Collpitts_oscillator

[dfbowers]

I just had to try to get the coil off of my Cibola to work on the TGSL Circuit. I have been finding that doing things with just one hand has some definite challenges but finally success!

Ivconic, you were right. The coil is close enough to the Minelab coil that it works perfectly!! (on the work bench at least). GB and disc work correctly. I have not done any detection range testing but will post something up as soon as I can get my carousel hooked up again. I suspect that it will be similar to the TGSL coil.

I need to figure out how the sheild is grounded to post the correct pinout, but will do that soon as well. Again, I am challenged at the moment with posting schematics, etc..

Now for the bad part. I could not get the "Minelab" oscillator section to work correctly on breadboard, but was able to piggyback the oscillator from the SMW directly to the TGSL. I just had to cut one of the leads to the 2k2 resistor (R1) and change C6 below to 330n and I ran V- to ground instead. Audio is a little lower so might want to cut or relocate D5. Oscillator frequency is in the mid 8kHz range and varies depending on the amplitude setting. I suspect no different from the oscillator section on the Minelab coil version of the IGSL.

More to come..

Don

Some initial testing.. With Tx amplitude of 8v, a 1e detection range is 33cm using an 8" x 9" concentric coil for Cibola/ Vaquero. (I can run the Tx voltage up to 16V p-p).

Looking as some coil prices:

Minelab coil (10" for Musketeer) - $310 retail
A good reason to use a Tesoro coil - $149 retail.
A great reason to make our own coils - about $45 !!

[ivconic]

Some initial testing.. With Tx amplitude of 8v, a 1e detection range is 33cm using an 8" x 9" concentric coil for Cibola/ Vaquero. (I can run the Tx voltage up to 16V p-p).

Looking as some coil prices:

Minelab coil (10" for Musketeer) - $310 retail
A good reason to use a Tesoro coil - $149 retail.
A great reason to make our own coils - about $45 !!