Hello
I've found this pc oscilloscope web page;
http://scopeonpc.tripod.com/adc.htm
Any one try this ADC for pc scope ?
Is there any freeware to do spectrum analysing (FFT) who would work with that PC parallel port ADC ?
Thank
Gaetan, Canada
I've found this pc oscilloscope web page;
http://scopeonpc.tripod.com/adc.htm
Any one try this ADC for pc scope ?
Is there any freeware to do spectrum analysing (FFT) who would work with that PC parallel port ADC ?
Thank
Gaetan, Canada
I_Forgot said:
Hello
No need of 100mhz, I will use the scope only for audio bandwidth.
I find that scope so much simple to built ; http://scopeonpc.tripod.com/adc.htm
But I need a software to do spectrum analysing (FFT) with that scope, since the ADC of this scope use the PC parallel port input, I can't use those spectrum analysing software who use the sound card.
Thank
Gaetan
Hi
I did found two pc scope plans with higher Samples/sec rate.
http://www.geocities.com/lptscope/hw.html
http://www.volny.cz/elecon/lptoscilloscope/lptoscilloscope_m.html
Gaetan
I did found two pc scope plans with higher Samples/sec rate.
http://www.geocities.com/lptscope/hw.html
http://www.volny.cz/elecon/lptoscilloscope/lptoscilloscope_m.html
Gaetan
I_Forgot said:
thanks for the link. thats a great project.
if you have other links to such PC based oscilloscopes even if they are in the 10-20Mhz range please do post them, I am really interested.
Hi
I found a web site using a Pic for a Pc scope but I don't understand how he program it.
Here's the link;
http://www.semifluid.com/?p=24
Gaetan
I found a web site using a Pic for a Pc scope but I don't understand how he program it.
Here's the link;
http://www.semifluid.com/?p=24
Gaetan
June, 2007 issue of "Nuts and Volts" Magazine, page 5 ad: http://www.link-instruments.com ... US$800 buckerroos ... Oh brother, wherefore art thou, Dan Kaminski
For those fortunate enuff to be running a Mac... i have the older OS 9 version running on an old beige G3. Will use any I/O you have (built in or an external FW or USB box)
http://www.channld.com/mts.html
dave
http://www.channld.com/mts.html
dave
Holy Cow! an Apple Scope, free for the downloading! ... that's the whole software ball of wax for using just about any audio interface as an audio 'scope ... any Apple based multichannel audio input/output device would work for an easy ~50k to ~200k+ 'scope range ... from this: http://www.digitalaudio.dk/ax24.htm to this: http://www.m-audio.com/products/en_us/JamLab-main.html
Useful oscilloscopes have knobs on.
But as was pointed out by I_Forgot, an oscilloscope that can only see audio is virtually useless for audio. There is no such thing as too much bandwidth - 20MHz is the absolute minimum and 100MHz is much better. Seriously, virtual oscilloscopes (PCs or Macs pretending to be oscilloscopes) are a waste of time and money. A decent 'scope is one that doesn't miss things and that is easy to use. Virtual oscilloscopes fail on both counts (and so do many digital "real" oscilloscopes). Buy a second-hand 100MHz Tek and be done with it.
But as was pointed out by I_Forgot, an oscilloscope that can only see audio is virtually useless for audio. There is no such thing as too much bandwidth - 20MHz is the absolute minimum and 100MHz is much better. Seriously, virtual oscilloscopes (PCs or Macs pretending to be oscilloscopes) are a waste of time and money. A decent 'scope is one that doesn't miss things and that is easy to use. Virtual oscilloscopes fail on both counts (and so do many digital "real" oscilloscopes). Buy a second-hand 100MHz Tek and be done with it.
FastEddy said:Holy Cow! an Apple Scope, free for the downloading!
It will stop at random times if not purchased but does give a good chance to try it. I mostly use mine for signal generator and speaker measurement (where its limited bandwidth is not a huge issue -- bandwidth is limited only by the I/O device and as those get wider bandwidth so does the scope)
dave
" ... bandwidth is limited only by the I/O device ..."
... same same with any 'scope software. A USB 16 bit / 48k, DAC / ADC would be limited to that 48k bandwidth and 16 bit resolution. Most 'puter 'scopes have 8 bit A to D convertrs but much broader resolution (bandwidth) ... so it would be a bad trade off for anything above audio range. I also noticed that several of the music recording software tools can display "oscilloscope like" graphics (like ProTools, etc.), also quite useful to audio types. But your link was the first I knew of this "shareware" 'scope software ... I like it.
... same same with any 'scope software. A USB 16 bit / 48k, DAC / ADC would be limited to that 48k bandwidth and 16 bit resolution. Most 'puter 'scopes have 8 bit A to D convertrs but much broader resolution (bandwidth) ... so it would be a bad trade off for anything above audio range. I also noticed that several of the music recording software tools can display "oscilloscope like" graphics (like ProTools, etc.), also quite useful to audio types. But your link was the first I knew of this "shareware" 'scope software ... I like it.
Here is the circuit I've been using for several months now. I like it.
http://xoscope.sourceforge.net/hardware/hardware.html
Its basically a buffer to protect your pc. I use it with my modified soundcards for audio BW. It has much better sensitivity than any scope I've used, and is easier to read too...
I've found a couple of programs I like:
http://www.zeitnitz.de/Christian/Scope/Scope_en.html
This one is good for basic scope functions.
http://www.sillanumsoft.com/
This one does averaging and frequency analysis, which is nice.
Sometime I'm going to dive into rmaa:
http://audio.rightmark.org/index_new.shtml
-Patrick
http://xoscope.sourceforge.net/hardware/hardware.html
Its basically a buffer to protect your pc. I use it with my modified soundcards for audio BW. It has much better sensitivity than any scope I've used, and is easier to read too...
I've found a couple of programs I like:
http://www.zeitnitz.de/Christian/Scope/Scope_en.html
This one is good for basic scope functions.
http://www.sillanumsoft.com/
This one does averaging and frequency analysis, which is nice.
Sometime I'm going to dive into rmaa:
http://audio.rightmark.org/index_new.shtml
-Patrick
FastEddy said:" ... bandwidth is limited only by the I/O device ..."
... same same with any 'scope software. A USB 16 bit / 48k, DAC / ADC would be limited to that 48k bandwidth and 16 bit resolution.
Any digital sampling scope, including one that uses a computer sound card, requires some anti aliasing filter at the input to limit bandwidth of the signal hitting the DAC. A 48 ksps DAC would have a theoretical BW of 24 kHz, but a practical BW of 10-15 kHz due to the difficulties in making good sharp cut-off filters.
Not very useful...
I_F
I_Forgot said:Any digital sampling scope, including one that uses a computer sound card, requires some anti-aliasing filter at the input to limit bandwidth of the signal hitting the DAC.
As you say, it's needed. But it's not there. It's assumed that anyone having the money to buy an oscilloscope has a nodding acquaintance with Nyquist and will recognize aliasing when they see it. The reason oscilloscopes don't have an anti-aliasing filter is that it would have to change filter frequency to suit sample rate (which changes dependent on timebase setting and record length).
This lack of anti-aliasing filter and reliance on user-expertise is one of the reasons why I try to steer people away from digital oscilloscopes. You need a whole lot more knowledge to use a digital oscilloscope than an analogue...
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