Re: PC Digital Oscilloscope and Audio Generator interface Software
- --- "wdavis364" <wdavis@...> wrote:
> Looking for opinions and advice on PC Digital Oscilloscope and
> Generator interface Software. I'm not an electronic expert by anyBill:
> means. I just need something that will give me some ideal what a
> circuit is doing.
> What are the pros and cons?
I built a simple one a few years ago using an old audio card, from
which I hacked out the Low-Pass filter (used to clip nything above
20KHz). It was from a site on the web somewhere. However, I spent 5
minuts and could not find the reference. I am sure I have it on
paper somewhere. Search the web. You will find free schematics and
I achieved very good results up to about ~200KHz. Afer that, the
accuracy really dropped off. However, at the time I was not seeking
accuracy, but rather the "general shape" of signals. I could get a
decent read on signals to about 1MHz (with a bit of extrapolation on
What is your budget? If you are one of the lucky ones that can spare
~$100 to $200, then you can buy some ready made ones that are not
http://www.parallax.com/detail.asp?product_id=28014 - $129
http://electronickits.com/gold/vepcs100.htm - $179.95
(there are lots of others out there)
Parallax has a good support record, at least in my book.
These will not rival a professional (Tek) model. However, they may
get you what you need at a decent price point.
Three other quick sources:
1) http://www.ebay.com <- several people here have purchased used
but working equipment from ebay (myself included). When I upgraded
the homebuilt model, I went that route. You may have to hunt a bit
before finding a deal, but occassionally you can snag one for pretty
2) Although this is slight off of what you requested, there was a
review of logic analyzers in EDN back in December. Although these
are not exactly what you are seeking, the article is useful in
demonstrating what to look for:
3) I was conversing with a guy in India (Ramachandra) who built a
DSO using an 8051 Micro. His was good in the audio range (up to
~125Khz). He offered some time ago to work together on a project to
design and build a higher BW project. I have not spoken with him in
about a month. However, he might still be interested in
collaborating on one with you if you want to build one from scratch.
Let me know and I will introduce you two.