Hi Niklas-
I thought this is an interesting project and actually looked into obtaining
parts, not too bad.  I'd even be interested in sharing the cost of getting a
board made.
http://www.chocbar.demon.co.uk/
DSO Specification
                         The DSO has the following specification, this is likely
to change significantly as the project is further developed.

             Channel Spec
                            1.6MHz to 50MHz sample rate
                            8 Bit resolution
                            3MBit sample depth
                            Analogue and digital capability
           Operating Modes
                            Dual channel (2 analogue channels)
                            Single channel (double speed and depth, i.e. 100MHz
& 6MBit)
                            Logic analyser (16 digital channels)
                            Mixed mode (8 digital & 1 analogue channel)
              Triggering
                            Variable pre-trigger
                            Variable edge trigging threshold
                            External trigger input
                            Logic analyser triggering
              Software
                            Fully GUI driven
                            Full control of hardware from software
                            Zoom & Pan functions
                            Trigger level & point indicator
                            CSV export function
                Misc
                            Flexible design allows for expansion and bug fixes
without hardware modification.
                            ISP (In System Programmable)
David

Niklas Lvvgren wrote:

> Hi
> As I feel my economy wouldn't support obtaining an oscilloscope I've had
> thoughts of designing
> and building some kind of simple data acquisition gadget. Now I don't mean
> some super scope with
> +100MHz sampling more something simple with specs like:
> - Moderate sampling frequency, 10 - 40MHz
> - Triggering functionality like if >trig level then trig
> - Ability to transfer the data to computer for visual output
>
> A have a draft idea of the system architecture:
> It will consist of two parts:
> 1. The actual acquistition hardware, with two alternatives
>         a. A ADC together with one or more FIFO (which I believe is the
> commercial solution)
>         b. A ADC together with an SRAM and memory controller with adress
> count etc (would be sufficient
>            at lower fs)
> 2. A host controller, an MCU of choice, to take care of the PC interface and
> overall control.
>
> My choice of hardware would be (due to availability): MCU AT90S8515 (if
> sufficient), random logic
> Altera EPM7064, ADC TDA8703?
>
> So now my questions are:
> 1. Is there anyone who have done anything like this before?
> 2. Do you have any suggestions about improvements, additional features etc?
>
> /Niklas
>
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David Harris
  OmniPort Home Page:  http://www3.telus.net/OmniPort1/
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