I 2nd this suggestion.  If you are in desperate need, find $90 by=20
selling old clothes on ebay and washing friends' cars and buy this.  I=20
would not consider doing an oscilloscope design on a tight budget,=20
timetable, and especially without a scope to help debug it.

Spend your energies designing the unusual, not the easily available for=20
$100.  Leave re-inventing the wheel for when there is a really good=20
reason (saving several $thousand, minimally) or you have nothing else=20
you care to do.

My 2c.
J


Brendan Gillatt wrote:
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> On 18/02/11 16:54, V G wrote:
>> Hey all,
>>
>> I'm in desperate need of some sort of "oscilloscope" but don't really ha=
ve
>> the money to buy one at the moment. So I decided to make one.
>>
>> It's going to be a very simple, low speed oscilloscope.
>>
>> * For the ADC, I'm planning to use the LTC1418:
>> http://www.linear.com/product/ltc1418 (5V, 14 bit, 200ksps, SPI, high
>> impedance analog input, 0-4.096V input), which means around 100KHz bandw=
idth
>> tops, which is more than I need for now.
>>
>> * The input to the ADC will come from a high precision opamp, probably a=
n
>> LTC1050: http://www.linear.com/product/LTC1050
>>
>> Here's a basic overview of what I'm thinking (attached as well):
>> http://img340.imageshack.us/img340/5610/oscilloscope.png
>>
>> What do you guys think?
>>
>
> Have a look at the DSO Nano oscilliscopes if you're on a budget:
> http://www.seeedstudio.com/depot/dso-nano-v2-p-681.html?cPath=3D174
>
> They are spec'ed up to 1MHz analog bandwidth (which is a lie--they
> /sample/ at 1Msps so max 500KHz signal frequency at best).
>
> At $90 you would be hard presed to completely develop from scratch
> without spending more.
>
> Brendan
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--=20
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