Have to looked into this?

http://www.bitscope.com/

I know it exceeds the $70, but it seems like it'd be a good starting point.
All schematics and tech articles are available to download.

Good luck


On Monday 19 May 2003 05:09, you wrote:
> Hey, I hate to beat the dead horse but here goes anyway...
>
> Me and a friend from my university are working on a PC-based oscilloscope.
> We were just wondering if anyone had any suggestionns on how deep the
> memory on such a thing should be etc...
>
> What we have planned for now is a 40 MHz capable paralell ADC with 2 pcs of
> 32 kbyte 70ns SRAM.  (I had two of theese chips just lying around in an old
> Nokia 2110)
> By using some buffers and a odd/even tactic on the storing we can achieve
> 28 MHz from the memory.  This would give us a max resolution of 14 MHz...
>
> 28 MSPS with 64 kbyte isn't a whole lot, but is it enough ?
> The annoyingly smallish logic-analyser at my campus has only 4 kbyte...
>
> We are also incorporating a programmable clock-generator so we can select
> samplerates from 1-28 MSPS in 0.5 MSPS steps.
>
> All ideas and thoughts are welcome.  We aim to build it for less than $70
> in parts so don't go crazy.
>
>     KreAture
>
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