AVR+DSS Frequency Mod SD2100V2

[mario]

Put in another 3 hours

Everything still stable, the mod keeps going strong.

No sparks or smoke !

My offer still remains: A FULL non-assembled AVR-DSS kit for a working "DD" coil. I don't care if you build it. I just don't want to take time to build my own.



*Lipo kit or audio amp not included

[mario]

Software updated 1.3.2

In Windows, run "notepad" utility and paste the below code. Then save your file as "AVR-DSS-1_3_2.hex" and flash your uC.

Before flashing, change fuse bit settings to: Low:77 High1 Extended:FF

In future versions, I will provide support for:

1) A preset selection of 5-10 frequencies. I don't think loading of pre-saved frequencies is necessary because even though user-found "quiet" frequencies exist, these saved frequencies still depend on the position of the ground balancing and tune knobs. In other words, you have to maintain an identical position of all 3 knobs across the whole range of your saved frequencies for this option to be useful. If you move your knobs, which will eventually happen, all your quiet frequencies become "non-quiet." Notice that most frequencies become more quiet if you use the "Tune" and ground balancing pots correctly. A more appropriate labeling of presets should include their relation to system timings: For example, "Preset 1: 30uS", "Preset 2: 20uS", "Preset 3: 10uS", etc. However, I might end up providing support for pre-selected timings in addition to user saved frequencies.

2) Eeprom write support. This feature will not be compatible with SD2000s since they lack eeproms. However, the more I experiment with system timings, the more necessary it has become to be able to load custom settings. As some of you have discovered, the key to taming the threshold lays in the signal pattern. I have not done much research on this, but this issue needs to be implemented. Fortunately, our trusty Atmega328 has just enough pins for this feature.

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[Jiminy]

Thanks, Mario.
I liked your idea of putting it in a socket. More flexible when the time comes.
Something else to add to the "to-do" list for later.
/r
Jonn

[mario]

Hi jiminy,


I would leave that eprom untouched. Removing it may be tricky, and if removed incorrectly, removing it may damage one of the surface contacts.

Considering that no other binaries have been made public, there is no point replacing it.

[Jiminy]

Mario, GREAT work!
I would still like two of your blank boards when you're ready.
I shop at Digikey, Mouser, etal so I know where to find the parts.
Thanks again for the good work. Will be interested in the timings for the
27c256 also; I have a couple blanks. I can burn them in addition to the ATMEGA chip you used with the mod.
/r
Jonn

[mario]

Software done

I have completed the software (soon to be posted) and have resolved the last remaining issues.

You may watch the video here: http://www.youtube.com/watch?v=8UnrnvRAb68

I decided to cut the little board, and incorporate the controller module inside my power unit. I found enough clearance to fit the little board entirely inside the case, but decided to subdivide the dss module and main controller. I could not find enough room for the LCD, pot, and encoder in addition to the stock pots and selection switches.

I really like this mod since it allows me to use the stock ground balancing pots and switches. Though they now feel redundant, I did find myself using them alongside the encoder for fine tuning the frequency at the lower settings.

I know this mod is more of a sophisticated frequency hack. A more refined approach would have been to replace the whole oscillator/eprom/ transmit circuitry with micro generated signals, like some of you have done, but it is what it is...

Maybe after attaining a deeper understanding of the signal train could I then try to emulate it. If any one has a solid understanding of the signal and would care to explain it, please do drop me a message. Or If any one has a link to a good article or discussion on the issue, please do email me also. I envision the day some one will digitize the signal and process its characteristics via a super fast 32bit micro, assuming none of you have attempted it yet.

Anyway, one last addition to the mod I will eventually include (later rather than sooner) has to do with the eeprom. That eeprom just begs to be re-written to. The Atmega328 has a 1k eeprom so I could theoretically fit the entire system timings inside it (the contents of the 27C256 eprom don't exceed 1k). In fact, the stock timings currently expressed don't even exceed 256 bytes (don't forget about the 3 hidden timings -it's these 3 hidden timings that bring up the eprom size to 1k!); therefore, I might simply end up re-writing the program to include support for flashing this 27C256 with the contents saved to our Atmega328.

Imagine wanting to experiment with your own hand-made timings. If I include this mod, you would, simply, flash your Atmega with your experimental timings along side the stock timings. Then, when you're ready to experiment, you would flash your detector with your saved timings. And If anything went wrong, you would revert your timings back to stock-no harm done.

The eeprom mod is a perfect compliment to the frequency mod! All we need is 3 extra pins from our current setup and separate grnd/vcc rails. Here is great potential for further enhancing our detectors.


One last thing I will mention, I need some rest, so forgive me for disappearing for the next week or so....I've been working on this and need to stop. In addition to my regular job, I'm really really exhausted. To all of you that have posted and have shown interest in the boards, I have reserved them for you. I will just need the types of configurations you desire (board-only or board+component combos). I will only sell the AD9851 chips to those who can not find suppliers -they're really pricey, digikey's selling them at $29US!

To everyone else who's interested, email me to reserve a board. I only have a selected remainder so some of you might not get them...I might order another print run if there's enough interest, but unlikely...

just please give me some time to take a brake...

thank you for understanding


Note: I screwed the dss sub module to the daughter pcb and will include the controller inside my power supply.

[IBGold]

Hi Mario,

That was just a bit of wishful thinking of mine with the VCO I have I find the higher frequencies quieter and with the VCO you can very slowly go through and find the most stable and quiet frequencies in any range the only problem is its jitter, I search with both channels except with the 6 MHz crystal I realise we are locked in to the pulse train we have, but frequency changing seems to work well also my sample windows open a little earlier than normal but overall I am very happy with how it performs it is a combination of many different peoples ideas and mods but the most important has been Zed's input and help and of course Stefan's help.

Regards, Ian.

[mario]

Still working on it, putting in hours here and there...

Anyways, sorry about the parts list being inaccessible. I forgot to change the privacy settings. I might add a few more caps, but the bulk of the list will not change.

Schematic is also accurate and complete.

BoM found here:
https://spreadsheets.google.com/spre...hISGc&hl=en_US

[mario]

[mario]

Hi Ian,

When I hunt, I rev up the frequency just before the ground becomes noisy. Doing so will tighten the timings enough to ignore the mineralized ground conditions while still triggering a response.

I hunt in channel one until finding a target. if I find something interesting , I confirm the target by switching to channel two. If the target triggers channel two, I start digging.

From my perspective, if we can do a frequency sweep several uS below the ground becomes noisy, we will get better sensitivity. However, if the target is too small to trigger a channel two response, then we might miss the target entirely.

So, in my honest opinion, thightening the channel two timings will probably provide us with an opportunity to make our detectors even more sensitive -assuming the user hunts in the above mentioned manner.

Unfortunately, the channel two timings and channel one timings are mutally exclusive of each other. In other words, by changng the timings through the frequency you change the timings of both channels, not one or the other.

And the only way to modify the two channel timings independently is if we go ahead and change the contents of the eprom...

[IBGold]

What woul be nice would be to be able to set the frequency range say 1.0MHz to 4.5 MHz and then sweep that range and when a signal is picked up it locks for say 10 seconds at the frequency in question now would that not be nice may elininate detector holes but it is out of my league.

Regards, Ian.

[moodz]

Hi Mario,
my comment was a bit cheeky....I was just indicating a possible shortcut for some who dont like surface mount soldering etc. Of course there is always opportunity to make a new an improved wheel like your good work.

regards,

moodz.

[mario]

Moodz,

Before building my solution, I explored several options. After my failed attempt at trying a programmable VCO (like Ian), I found the above board on ebay.

It is sometimes difficult to trust the claims of those ebay sellers. The above board does not use AD9851 for DSS, but did claim similar specs.

Sometimes it pays off to reinvent the wheel.

[mario]

Thanks Ian,

This mod should work fine with the SD2000s. i did not notice any jitter from 1-4Mhz,so there should not be any audio issues. Still, I would like confirmation.

However, with the SD2100s, the situation becomes tricky. Because I'm inderectly controlling the frequency, those two caps limit my range . if im not carefull jitter starts distorting the audio.

My next step involves finding the right cap combination before finishing up. Otherwise, I'm going to slightly mod the audio.

[moodz]

DDS 50 bucks on ebay ... sometimes buying beats building :-)


See ebay .... just search on "DDS"

eg .... item 280700041512

these are new items !!

1. Signal Output function

• Output waveforms:Sine wave, Square wave and Triangle wave
• Output amplitude:≥10Vp-p(signal output, no load)
• Output impedance:50Ω±10%(signal output)
• DC offset:±2.5V(no load)
• Display:LCD160
• Frequency range:0.01Hz ~ 5MHz(SG1005)
• Resolution:0.01Hz
• Frequency Stability:±1×10-6
• Frequency accuracy:±5×10-6
• Sine wave distortion:≤0.8% (reference frequency is 1kHz)
• Trinagle linearity:≥98% (0.01Hz~10kHz)
• Rise and fall time of square wave:≤100ns
• Square Wave Duty range:1%~99%

2.TTL Output function

• Frequency range:0.01Hz ~ 5MHz(SG1005)
• Amplitude:>3Vp-p
• Fan Out:>20 TTL loads

3.COUNTER function

• Counter Range:0-4294967295
• Frequency Meter Range:1Hz~60MHz
• Input Voltage Range:0.5Vp-p~20Vp-p

4.Others function

• Save and Load Parameter:0-9(0: default load)

Package included:

• 1 x 5MHz DDS Function Signal Generator Source Module Wave
• 1 x 5V Power Supply