IGSL

[mschmahl]

Hello medj.
Have you connected D1 and D2 to pin 5,6 or 9 of U2? You need it, to get a tone.
What do you want to say with your drawing (schematic) and 1 and 2?

[Stoeberix]

Hello Davor, I ask too much, but it´s important to my understanding.
What is the different between IGSL and IGSL Musk (Musketeer).
It´s only the coil? or it´s the efficience too. For the normally IGSL, I can use the TGSL coil (DD-coil);
and for using the musk coil (??-coil), I must get the IGSL musk?
What are the properties of the musk coil? Who can I take here the technical data of this coil
( ? swg cupper, ? windings of the turns about the coil, ? diameters),? with or without shield?
Can do be the housing with ALU oder plastik?, do must be a shield?
and an important, how can I know it, at what deepth is the tresure metall during the detecting?
Thanks with greetings

[Stoeberix]

Hello everybody,
I need a CAD design programm for elektronik schematas and to design pcb´s.
With my AutoCAD mechanical is the design working not so well.
Can you recommend me a design software, whom I working with well done,
to develop schematas and pcb´s. Wich software are you using?
And whom I can get it?
well thanks with greatings to award engineering together

[mschmahl]

You can use designspark. It is free and all in one program. http://www.designspark.com/eng/page/...-pcb-home-page
See your PM´s.

[Davor]

What is the different between IGSL and IGSL Musk (Musketeer).

IGSL TGSL is designed for TGSL coil, which is roughly 6mH both Tx and Rx. It uses a simple oscillator and operates at ~14kHz. You can use standard Tesoro coils with it, but most people build their own.
IGSL Musk. is intended for operation with Musketeer coil, which is ~1mH Tx and 16mH Rx, and is operated at ~8kHz. The oscillator is a bit more complex, But the rest of the device is the same.
Depth will be roughly the same, and differences are mostly minimal. In linear scale there is a slight advantage in performance for Musk version, but in reality of detecting this difference is difficult to observe.

[giuhalftrack]

Hi i's been a long time since my last post on this forum, and now i'm trying to have my IGSL TGSL (original tesoro 8" coil) originale setup + pin swap (10 -11 on FE block) working.

ferrite is rejected at both blocks (FE - NFE) only when the knobs are about 270° degrees to the right.....
i remember that I reed somewhere that this could be generated by a tuning problem (I think the ratio between TX and RX ? 1.11)
my oscillation frequency is about 14.1 KHz and the tuning capacitor in RX are the same of the original design (4n7 + 10n parallel)

The strange thing is when the detector is ground balanced, hit a 1 euro coin at about 20 - 23 cm but no sound came out for Iron objects, you must bang the coil with the iron object to get a sound

I'm planning to pack-up the detector and move in the woods to perform a test far from EMI...

Several error were fixed on my detector:
Bi-pol caps
potentiometer sense
pin swap
broken Transistor in oscillator

[Davor]

In case the phase shift is too big you get ground balance at high GB potentiometer values, but the discrimination range for ferrous objects becomes better. In case you get good GB at low potentiometer values, you'll have reduced discrimination tuning range.
Do you have an oscilloscope to check if switchers get proper drive?

[giuhalftrack]

In case the phase shift is too big you get ground balance at high GB potentiometer values

No oscilloscope avaible !! I use a software like Visula Analyzer (probe goes on PC soundcard)...

I'm planning to make the phase meter proposed in this forum to check TX-RX phase difference.. any worth on this ? do you refer at this phase shift ?

but the discrimination range for ferrous objects becomes better. In case you get good GB at low potentiometer values, you'll have reduced discrimination tuning range.
Do you have an oscilloscope to check if switchers get proper drive?

I suspect this.... last night i was thinking... I'm rejecting too much "ground" then too much Fe-Mg materials goes out..

[Davor]

Yes, I'm referring to Tx to Rx phase shift, but GB is a specific phase for your terrain and it is unlikely that you'll disappear any Fe material significantly. Provided your terrain is not extremely mineralised.

With normal terrains GB will be close to ferrite response. The ferrite response is shifted only for Tx to Rx shift, so the easy way of learning what phase difference you have is to observe Tx signal with GB shifter output. With 0° Tx-Rx shift it would produce 90° between Tx and GB shifter output, which is square shaped. So in case of 0° Tx-Rx the square signal would split the Tx sinusoid at it's peaks, but a realistic shift would pass elsewhere. Takes a little tuning on your probes and a scope.

[giuhalftrack]

Yes, I'm referring to Tx to Rx phase shift, but GB is a specific phase for your terrain and it is unlikely that you'll disappear any Fe material significantly. Provided your terrain is not extremely mineralised.

ok I investigate phase shift, if I remeber it will be 20° is this correct ?

please clarify another thing, RX(resonant frequency) = 1.11 TX(resonant frequency or the oscillation frequency ?)

Sorry but i'm out of electronics from the 1997 and i'm a little confused somethimes

[Davor]

You are correct. Rx resonance must be above the Tx resonance. The phase shift will be also influenced by the coil loading, and that one depends on your Rx front end connection, which in case of IGSL can be non-inverting, inverting, or differential. The inverting one is noisiest and provides the most coil loading of all, so avoid it if you can.

[medj]

Where pieces compose d1 and d2
...........
Do not hear the sound in igsl unless changed the direction of
diod 20 * diod 19
Where the problem, please
http://im32.gulfup.com/OmzAQ.jpg

[Davor]

Reversing these diodes makes no sense. Please make a photo of your board.

[medj]

Please help the device does not function
This link vidio in the form of WinRAR
http://www.gulfup.com/?emCg6x
or
http://www.4shared.com/rar/5_p-hOuj/proplem_igsl_.html

[liekwang]

davor is this true positive and negative pole position