> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Kyrre Aalerud
> Sent: Monday, 19 May 2003 5:09 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: Building a PC-based oscilloscope...
>
>
> 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
Sounds great. My Tek TDS220 has les ram to be shared between 2 saved
waveforms (2.5K each) a 2.5K record buffer and user setups, it is annoying
as it is not quite enough, I wonder if anyone has a mod to add more ram
:o)))))

I would like to build a device with lots of ram for single channel digital
capture device (IE capturing Ibutton data or DMX 512 data) I would like to
capture 10 minutes worth, and as SDram is CHEAP 128Mbyte for only au$20 inc
GST what the heck :o)

Just need to find something to address that much ram lol


Regards,

Kat.

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