Full m/lab SD2000 schematics

[porkluvr]

Your guys should not copy intellectual property. You all should make use of your own brain.
Aziz

Hey, it's my idea - I stole it.

Qiaozhi, I may have to get one of those round tuit thingies.
My philosophy has always been "never put-off today what can be put-off tomorrow".

[Aziz]

Hi porkluvr,

you don't need the complete digital logic. Using a simple and low-cost AVR µC (e.g. ATtiny 2313-20PU) does the job well. You can dramatically reduce the complexity of the circuit with appropriate software coding. BTW, you can also reduce the other circuit parts (analog parts, DC-DC converter, audio-stage and so on). Then, you do not need the original circuit anymore.
It is more easy to start from the beginning. I am sure, there are some bugs or inconsistencies in the circuit. So why wasting time and effort?

Aziz

[discovery777]

The schematics is not true.Some Does SD 2000 for selling .

[discovery777]

Give me some meil for board.

[ismail surek]

hi to all of friends
has anyone have a pcb layer of minelab sd2000
i need it
thanks

[Unregistered]

Still lol.... I was told by a good source that David Murphy was doing the ring around to see what they could do to have this schematic removed. Seems like Graham Walters did not give a rats posterior as they are being paid out of their stock holdings by Codan. I wonder if Codan took into account the up and coming expiration of Candy's patents? By the way there is an engineering Goof on the circuit of the front end that holds back some depth performance..any takers? This not a copy Goof but a Goof when this thing was designed by that marvelous engineer Bruce (do the maths) (again) Baby.

On that topic, if the overall input resistance on the front end is halved then we have 6db better noise performance. This is an old but good overall design that leaves the later machines for dead if a few modifications are carried out to the unit. By the way if you want a psuedo sensitive smooth mode on a SD2000 add a larger capacitor to the r/c network on the on the (or lower the R) collectors on the input transistor pair.

Enough from me today..

P.S When can I publish the 4000 circuit? It is 90% the same as a 2000 bar the stepped pulse voltage circuit and the micro. No wonder they grind the part numbers off, must be pretty scared of being copied..lol

Enough from me today..lol

HI unregistered
Could you please expand on your input .. preferably about the values you would subsitute.
Am in the middle of modding my 2000 and would like some ideas .. asking you as i think you would have some better knowledge
thanks
george

[veltex]

Experimental PCB project PDF continuation follows on 2 payments

Experimental PCB project PDF continuation follows on 2 payments http://slil.ru/27023261

[aft_72005]

Experimental PCB project PDF continuation follows on 2 payments http://slil.ru/27023261

Hi veltex
Thanking for your nice drawing .
I had some of your drawing.
Best regards.

[veltex]

I spread first payment CD2000 REV 1.0 PCB AUDIO, RECEIVE CCT.
http://slil.ru/27036360

[gef12]

Nothing at the site .. it says link is broken ???

[Unregistered]

Here it is accessible http://filegu.ru/f/XWpJXZJO/CD2000A.rar.html

[kt315]

http://rapidshare.de/files/45986816/CD2000A.rar.html

[porkluvr]

typographical error

This is hardly worth mentioning but I've found a typo mistake on page one of Veltex's schematic. CA3080 is shown driving the NE5532 headphone amplifier. CA3080 is an 8-pin transconductance amplifier so that it would be hard to fall for that. Change the label to CA3083, which is a transistor array, same as shown on earlier schematics.

[veltex]

I spread second payment SD2000 REV 1.0 PCB http://slil.ru/27040620

[porkluvr]

Is BUK455-600 the correct part number for the two output FETs? I am wondering how the BYV28-200 can survive in a pulse circuit where peaks could reach 600V, but I won't stress over the apparent incongruity.

Veltex, thank you very much for the nice drawings. I don't plan on cloning the SD2000 but the subcircuits look very useful. Thanks you too, Zed. Good thread. Educational.