Getting to know PI with nucleo board and SD2000

[detectormods]

This is a good project to learn from, tap into an old SD2000 and switch between how it functions on its own and experimentally through a development board, eventually you will exceed the SD2000 operational performance and use the information to build your own detector.

[Orbit]

This is a good project to learn from, tap into an old SD2000 and switch between how it functions on its own and experimentally through a development board, eventually you will exceed the SD2000 operational performance and use the information to build your own detector.

Believe me, most people do not know exactly the performance of the original sd 2000 ! Nowhere did I come across data on the range in Australia, but in my country I don't think anyone has an sd 2000, there are newer models, but I don't think anyone has an sd 2000. Whenever I asked some people specifically about the depth, no one gave me a specific answer, most of us in Europe are interested in relics, coins, not native gold. I can only say that it took me a while to fully understand how sd 2000 works. My final version it has a range, for example, a coin with a diameter of 2cm =40cm,, coin with a diameter 2.8cm=50cm, gold coin 39.6mm=70 cm, aluminum lid made of NIVEA cream diameter 11 cm=120cm detects, coil commander 10 inches ! The same cream cover I tested a 50cm coil detects that cover at 160cm. The detector works very quietly, all functions work well !

I am personally very satisfied is it good I don't know, if the original sd 2000 can do better ?

[eclipse]

Probably removed the GB method? Most soils in Europe don't need ground balance. I have few SD2100s /similar to SD2000/ and these are a bit noisy.
If you came up with something to remove chattery behavior you can squeeze in some more depth. Some improvements in the preamp perhaps?

Anyhow on the topic, isn't the TX feedback going to be problem for nucleo? Or you suggest stripping the snubber tx circuit and limiting the TX voltage with simpler method thus keeping the timings easier to achieve?

[Orbit]

Probably removed the GB method? Most soils in Europe don't need ground balance. I have few SD2100s /similar to SD2000/ and these are a bit noisy.
If you came up with something to remove chattery behavior you can squeeze in some more depth. Some improvements in the preamp perhaps?

Anyhow on the topic, isn't the TX feedback going to be problem for nucleo? Or you suggest stripping the snubber tx circuit and limiting the TX voltage with simpler method thus keeping the timings easier to achieve?

No geb still plays his role, but you gave me the idea that geb is not needed in some places here. The frenzy comes from positive 5v volts, the preamplifier must still be like ad797 or something even better ,I can increase the gain from 47 to 100 because it is quiet ,if you look at the power supply signal +5V or 62KHZ there are sudden jumps at first I thought it was the generator however, everything is interconnected the problem is not the generator because I also measured the signal on the digital one with the processor I got peace of mind by playing around a bit with moving the second sample away from the first on all three channels and of course +5v created a little differently in the power supply..

[detectormods]

No geb still plays his role, but you gave me the idea that geb is not needed in some places here. The frenzy comes from positive 5v volts, the preamplifier must still be like ad797 or something even better ,I can increase the gain from 47 to 100 because it is quiet ,if you look at the power supply signal +5V or 62KHZ there are sudden jumps at first I thought it was the generator however, everything is interconnected the problem is not the generator because I also measured the signal on the digital one with the processor I got peace of mind by playing around a bit with moving the second sample away from the first on all three channels and of course +5v created a little differently in the power supply..

The internal switch mode is as noisy as a night club on Saturday night, but can be replaced to improve noise from 20mv to less than 2 or better, it does require mosfet switched damping to unload the receiver, but i only say it is a building block, having timings generated from a development board also allows for timing changes, and digital signal processing.

[detectormods]

Probably removed the GB method? Most soils in Europe don't need ground balance. I have few SD2100s /similar to SD2000/ and these are a bit noisy.
If you came up with something to remove chattery behavior you can squeeze in some more depth. Some improvements in the preamp perhaps?

Anyhow on the topic, isn't the TX feedback going to be problem for nucleo? Or you suggest stripping the snubber tx circuit and limiting the TX voltage with simpler method thus keeping the timings easier to achieve?

The existing ground balance is functional but not optimum, much improvements have been made.

[rickodetrader]

Is the ground channel subtracted from each channel in the sd2000?

[detectormods]

Is the ground channel subtracted from each channel in the sd2000?

It has to b subtracted from both channels or the ch 2 will be noisy as hell.

[Orbit]

Who wants to play with the sd 2000 or 2100, here is a mod for similar discrimination as on the tdi, the led on the iron dims and on the high conductors it lights up more.

[Hassanp]

Hello friends, I live in Iran and there are many problems here. Can you email me the files for making sd2000 or sd2100? Thank you [email protected]

[Op04]

Who wants to play with the sd 2000 or 2100, here is a mod for similar discrimination as on the tdi, the led on the iron dims and on the high conductors it lights up more.

Many thanks for this mod! Incredible! Somehow I missed this post. But, is it possible that you will share the hex and fuse setting for this? Thank you Sir Orbit

[detectormods]

I added automatic ground balance to the SD2000, only have had time to bench test but it seems to work.

[Op04]

I added automatic ground balance to the SD2000, only have had time to bench test but it seems to work.

Wow!! Please share the schematic with us here Sir?.....many thanks!

[detectormods]

I have not even made a schematic yet, but it is just an auto level servo with null detection and long time constant, but I am working on a better one using a pic and fast ADC.

[Op04]

I have not even made a schematic yet, but it is just an auto level servo with null detection and long time constant, but I am working on a better one using a pic and fast ADC.

Thanks for the hints.