TESORO GOLDEN SABRE

[simonbaker]

Hi Simon ,

This the output of the LF353 pin 1 that drives the sync pulse .
Although there is some distortion it seems to dissapear in the next stage.

[ATTACH]14722[/ATTACH]

The next 2 images are the outputs of the LM393 ...



[ATTACH]14723[/ATTACH]



[ATTACH]14724[/ATTACH]

And yes , I did build the complete TGS with notch and batterycheck : When I was reading all the posts at that moment the TGS had proven itself ... I thought .

I saw the TGSL pcb's offered by Silverdog , maybe my next project.

Whenever you need some more images for comparison let me know.

kind regards ,

Dennis the Mennis

Ok, the TGS version explains why your TX signal is less distorted (assuming you have the JFet in the oscillator circuit) than the TGSL versions.

Also bear in mind that the TGS version that you built does not have as high voltage for the TX signal (because of the JFet stabilizer), and therefore probably will not have as much depth as the TGSL versions. So that may explain some air depth limitations you observe, although you have achieved some pretty good numbers.

It also explains why your LF353 pin 1 looks more clean than most TGSL versions -- you only have one little spike instead of lots of spikes. The lower TX signal does not overdrive the LF353 to cause ringing.

I think ApBerg perhaps assumes your graph is the RX signal rather than the sync pulse driver signal, and is suggesting some tuning of the RX caps -- which is not a bad idea in general to try, although you may have already done that.

Yes, it's a good time to start another project! You can learn a lot when you have several boards and several coils to compare. We'll look forward to your results.

Cheers,

-SB

[Dennis the Mennis]

Hallo Danny,

Think you have not a good receive signal, tray to adjust it with the 'receive cap' .

Make a 'Receive Cap' test circuit and see how the receive signal changes...

Hi Ap ,

I will try this soon and let you know , still so many things to try

Fryslân Boppe ( I think there is no online-translator who can translate this )


kind regards

Danny

Dennis the Mennis

[georgi.g.zhelev]

DD27.5 sm

Hi all
Anyone searching for a casing(corpus) diam. 27.5sm for MD?

Sorry for bad English !

[georgi.g.zhelev]

DD27,5sm

DD27.5sm........ABS.

[lunamay]

hi to all
i'm thinking about special mod for tgsl. Something like audio mod for white's. i did'n made enought mesurements but i think that something like that, a multitone id could be used in tgsl modification, maybe using timer ne555 what do You think??

best regards

[simonbaker]

hi to all
i'm thinking about special mod for tgsl. Something like audio mod for white's. i did'n made enought mesurements but i think that something like that, a multitone id could be used in tgsl modification, maybe using timer ne555 what do You think??

best regards

It's a neat idea. But I think you need a way to measure phase rather than use the discriminator.

I'm still trying to make a really solid, deep TGSL first. I'm also playing with the idea of using a microcontroller to replace as many parts as possible on the TGSL, but that is a long work in progress.

-SB

[Dennis the Mennis]

Hi all
Anyone searching for a casing(corpus) diam. 27.5sm for MD?

Sorry for bad English !

Yes , I'm searching and I'm interested , how many do you have ?

It would make me happy


kind regards ,

Dennis the Mennis

[Qiaozhi]

Hi all
Anyone searching for a casing(corpus) diam. 27.5sm for MD?

Sorry for bad English !

What is the distance between the lugs on the coil shell where the stem is attached?

[georgi.g.zhelev]

DD27.5sm

What is the distance between the lugs on the coil shell where the stem is attached?

Hi, distance is 20mm(standart).weight 160gr. Please, PM for more questions.

[manurespreder]

Hello there i made my first metal detector tgsl eldorado latest version. Now i am planning to buy a coil for it and. i found few on ebay

1st one http://cgi.ebay.co.uk/MINELAB-EXPLOR...item53e59a4d28

and second one
http://cgi.ebay.co.uk/MINELAB-EXPLOR...item2a0d72269a

witch one is better for my tgsl?

waiting for few parts to arrive and cant wait to do first tests of my tgsl. i really hope it will work.

[dfbowers]

You mean "Eduardo's" PCB, right?

I don't think that is what you want to look for in the way of coils. The Explorer coils are wideband coils and the inductances are way off. You want 6.0mH and 6.5mH for Tx and Rx.. Not 470uH and 580uH.. You might want to look for the original Tesoro coils that match the parameters in the database below.

Here is a link to the coils database.

http://www.geotech1.com/cgi-bin/page...oils/index.dat

[Qiaozhi]

Hello there i made my first metal detector tgsl eldorado latest version. Now i am planning to buy a coil for it and. i found few on ebay

1st one http://cgi.ebay.co.uk/MINELAB-EXPLOR...item53e59a4d28

and second one
http://cgi.ebay.co.uk/MINELAB-EXPLOR...item2a0d72269a

witch one is better for my tgsl?

waiting for few parts to arrive and cant wait to do first tests of my tgsl. i really hope it will work.

Any one of these would work -> http://shop.ebay.co.uk/?_from=R40&_t...All-Categories

But the prices are a bit high at the moment, and you should be able to get a secondhand one cheaper. You need to look for a Tesoro coil with the 5-pin connector. A Laser coil (5-pin) should also work ok.

[manurespreder]

dfbowers: yes i meant "Eduardo's" PCB

Any one of these would work -> http://shop.ebay.co.uk/?_from=R40&_t...All-Categories

But the prices are a bit high at the moment, and you should be able to get a secondhand one cheaper. You need to look for a Tesoro coil with the 5-pin connector. A Laser coil (5-pin) should also work ok.

Ohh i thought i need 4-pin connector cause on pcb i have only 4fires rx tx. forgot about ground..

I planned to do coil by my self but when i saw prices of wires in my local shop i had to forget about it...

[Qiaozhi]

dfbowers: yes i meant "Eduardo's" PCB



Ohh i thought i need 4-pin connector cause on pcb i have only 4fires rx tx. forgot about ground..

I planned to do coil by my self but when i saw prices of wires in my local shop i had to forget about it...

I think the 4-pin connector coils have different inductance values to the 5-pin. It would be great if someone could confirm / deny this. The original Troy detectors were derivatives of Tesoro, and these use a 4-pin connector. The TX and RX coil inductances are something like 1mH and 15mH, if I remember correctly.

[woody]

i thought tesoro 4-pin connectors were 14-18 khz and the 5-pin connectors were 10khz