Garrett (pulse) XL 500

[reptooyep]

Are there somebody who have traced the control signals timing of the two sampling points?
I am studying the circuit with purpose to do some modifications; I found it very interesting!!!
Any help would be appreciated.

Hi,
What kind of mods do you want to do ?
I think the man who will help you much on this thread is blobber (Fred).
My circuit react with metal but it's not working properly for the moment ...
When it will, i'll be interrested to help you and know more about your mods.

[blobber]

Are there somebody who have traced the control signals timing of the two sampling points?
I am studying the circuit with purpose to do some modifications; I found it very interesting!!!
Any help would be appreciated.

Maybe I can do this. Yesterday before I closed my box again, I had made some new measurement screenshot.
Could you please explain what you need and which modification you plan to do!

[Altair]

Reptooyep and Blobber,
thanks for reply. I am thinking about a microprocessing generations of control signals in order to manage it dinamically and thus add more capability in detection.
A better preamp stage would be another point to develop, with also a new coil drive stage.
I should like a time diagram (oscilloscope tracing, manual sketch) with time signals durations of the two sampling control signals, in the range: min, max of eliminator pot.
Ok, I could draw it by himself but if it's already available....

[bernte_one]

hello fred, try this way
http://www.geotech1.com/forums/attac...6&d=1464802146
you can buy all parts in Germany from hgt Technik
just pcb has to be modified or try another Project like pickini pi (just on on off Switch needed, rest is automatic calibration)

[blobber]

Nice design bernte_one, but this is made for divers. I like to use my unit, while snorkeling in breast deep water.

[blobber]

Reptooyep and Blobber,
thanks for reply. I am thinking about a microprocessing generations of control signals in order to manage it dinamically and thus add more capability in detection.
A better preamp stage would be another point to develop, with also a new coil drive stage.
I should like a time diagram (oscilloscope tracing, manual sketch) with time signals durations of the two sampling control signals, in the range: min, max of eliminator pot.
Ok, I could draw it by himself but if it's already available....

Sounds interesting.
.. dynamic PI detector with micro processor.
I hope this pictures, which I had made yesterday, could be what you need. If not so, please let me know!


What kind of micro processor do you think to use. Is there a possibility to use the ATXMEGA32A4U, like in the IB detector Krot FM2?
I would be glad, if you are planing an open source project, as you could share your information with this forum here.
In #29 of this thread, is a version with a PIC18 chip. It seems, that many people are very interested in such detector, but the hex file is unfortunately not included.

[blobber]

[blobber]

This time, I had made all measurements with plus pole of pcb to ground.

[ripsdevala]

This is a joke....

Glad to hear that.. what about the functionning ?

Not yet do futher test repto, need to do some work for the next few days.

[reptooyep]

Your drawing skills are great !!!

[bernte_one]

Nice design bernte_one, but this is made for divers. I like to use my unit, while snorkeling in breast deep water.

the desgin from minelab excalibur would fit
pot detector in pipe or if pie doesnt fit for pcb size use water sealed freeze container (tupper box) with rubber sealing
so you have nor probelsm to build a enclosure

[ripsdevala]

Progress...
Test signal from T2 collector...ok got signal
Put 709 (use LM308 )to check small signal...no, but my coil is make sound zzzzzzzztt when metal is close...???

[blobber]

I don't know, what you are doing...

When I make a detector, I never place all parts in a fast way, like a components soldering championship.
Every component has to be controlled, for the proper value, before you doing the placement in the board.
I start at first with the voltage supply , when this is working correct, I place the parts for the transmitter oscillator, after control with oscilloscope, I place in the receiver parts and make a test, than the amplifier, again control...and further stage by stage..part by part...test by test..
After every solded part, I also test the connection and the pads around, to see and protect of any short cuts. Also I make a check with the schematic, before I place any part in the pcb.

[ripsdevala]

Yes Mr.fred, its a bad habit, I will postpone this xl500, I will figure it somehow like my other detector, i have too much work outside from few days ago.

[WM6]

I don't know, what you are doing...

When I make a detector, I never place all parts in a fast way, like a components soldering championship.
Every component has to be controlled, for the proper value, before you doing the placement in the board.
I start at first with the voltage supply , when this is working correct, I place the parts for the transmitter oscillator,
after control with oscilloscope, I place in the receiver parts and make a test, than the amplifier, again control...and
further stage by stage..part by part...test by test..
After every solded part, I also test the connection and the pads around, to see and protect of any short cuts.
Also I make a check with the schematic, before I place any part in the pcb.

Good approach - suggested to anyone builder.