TESORO GOLDEN SABRE

[paku]

who on this forum have recompile file for pic16f88 for vdi project
can share

[Qiaozhi]

anyone got good tip how to hold the 4mv null when potting epoxy? the thing is its hard to gt close to 4mv.. once got it, hot glued it, then when epoxy cured, it would rise back to 100+mv.. a bit frustrated..

Leave an adjustable loop that you can use to get the correct null after the epoxy has cured. Then apply a thin layer of epoxy on top of the loop to complete the coil.

[der_fisherman]

Don't do it all at once, do say 75%, let it harden, correct and glue 10% more, let it harden, correct and glue another 10%, then let it harden, do the last 5%.......
I actually glue one coil completely and round75% of the second one, except for the part that overlaps the other....that gets glued in small stages, looking at the scope....
Its not perfect method by any means.....but it gets you closer......not that I am an expert, still VERY amateur.....
Hopefully someone knows an even better way!!

[sukri01]

anyone got good tip how to hold the 4mv null when potting epoxy? the thing is its hard to gt close to 4mv.. once got it, hot glued it, then when epoxy cured, it would rise back to 100+mv.. a bit frustrated..

[zlatica]

If you're measuring the signal at the output of the preamp, then (with perhaps 4mV residual voltage across the coil) you should get approximately 4mV * 50 [gain of preamp] = 200mV at the preamp output. You do not want to find the lowest possible null, as this will upset the ground balance and discrimination settings. Try reading the TGSL documentation that Ivconic produced, where he explains how to null the coil properly.

Ok. Thanks Qiaozhi

[Qiaozhi]

Mimimum range on my DVM is 20 V AC. 30mV is 0.03 V. I can´t to measure voltage below 10mV. Because I´m measurng voltage on pin 7 LF353.

If you're measuring the signal at the output of the preamp, then (with perhaps 4mV residual voltage across the coil) you should get approximately 4mV * 50 [gain of preamp] = 200mV at the preamp output. You do not want to find the lowest possible null, as this will upset the ground balance and discrimination settings. Try reading the TGSL documentation that Ivconic produced, where he explains how to null the coil properly.

[zlatica]

???
If you don't have a millivoltmeter, how are you measuring the minimum voltage as 30mV?

Mimimum range on my DVM is 20 V AC. 30mV is 0.03 V. I can´t to measure voltage below 10mV. Because I´m measurng voltage on pin 7 LF353.

[Qiaozhi]

Hello,

I don´t have milivoltmeter and I´m measuring voltage on pin 7 LF353. Minimum voltage on pin 7 is about 30 mV. Is it a good or no?

???
If you don't have a millivoltmeter, how are you measuring the minimum voltage as 30mV?

[zlatica]

Hello,

I don´t have milivoltmeter and I´m measuring voltage on pin 7 LF353. Minimum voltage on pin 7 is about 30 mV. Is it a good or no?

[zoomix]

Hello,

Here is finally the TGSL functioning properly. Very diffcult to achieve a proper coil.

Dicrimination works fine
impeccable GB

Test in air:

https://www.youtube.com/watch?v=Zu7G7DSoCXE

I am testing in the earth:

50cent euro is taken by TGSL at 20 cm and I compared with the Goldmaxx power who also takes limit.

I noticed that the TGSL must be swept slowly to make the target.

I would now improved sensitivity because I noticed the potentiometer varies very little

have you some tips to make measurements of sensitivity and improved?

Thanks

[zlatica]

Hello. I need the data for coil of 36 or 39 cm. Diameter and windings?

[Qiaozhi]

ko pg cari la charger nokia lama2 ko tgk la output dia berapa tu pun bleh pakai direct je

Please read the forum rules -> Basic Rules of the Forums
and make your posts in English.

[paku]

hi .. i i just got 3 li ion battery, each is 4.2v and 4200mah, anybody got battery chager circuit for this? i need to add this to my tgsl.

ko pg cari la charger nokia lama2 ko tgk la output dia berapa tu pun bleh pakai direct je

[der_fisherman]

The batteries you have are sometimes marked as 3.7 volts and sometimes it seems as 4.2 volts. But I believe they are 18650, check on the cell body for this number. If it is another number, ignore this post.
Then they are nominal 3.6 to 3.7 volts....

http://www.aliexpress.com/store/product/2-X-18650-4200mAh-4-2v-li-ion-Rechargeable-Battery-and-2-slots-charger-RED/710505_1223471732.html

These chargers are available EVERYWHERE!! ebay, internet, some shops and and and......
I hope this helps.
Andy

[sukri01]

hi .. i i just got 3 li ion battery, each is 4.2v and 4200mah, anybody got battery chager circuit for this? i need to add this to my tgsl.