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The time now is Thu 23 Oct 2014, 07:57
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 Forum index » Advanced Topics » Additional Software (PETs, n' stuff) » Engineering/Science/Simulation
xoscope_2.0.3.2 pet soundcard oscilloscope
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mister_electronico


Joined: 20 Jan 2008
Posts: 660
Location: Asturias_ España

PostPosted: Sun 16 Feb 2014, 06:36    Post subject:  xoscope_2.0.3.2 pet soundcard oscilloscope  

Xoscope is a nice oscilloscope works for linux and works through sound card.

I made this pet, and is working in puppyslacko 5.6 PAE, please if someone use please report to me.

You must install the package libcomedi_0.8-5.pet.


All packages are lightweight
libcomedi_0.8-5.pet
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Filename  libcomedi_0.8-5.pet 
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xoscope_2.0.3.2.pet
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mister_electronico


Joined: 20 Jan 2008
Posts: 660
Location: Asturias_ España

PostPosted: Sun 16 Feb 2014, 06:43    Post subject: check xoscope  

If you wan check xoscope, do not forget to look:

1) Check you alsamixer controls and set the microphone and all controls for working.

2) In the menu of xoscope File > Device --- select soundcard.

3) connect the microphone and speak.


Good luck.... see you.
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Moose On The Loose


Joined: 24 Feb 2011
Posts: 528

PostPosted: Sun 16 Feb 2014, 12:58    Post subject: Re: xoscope_2.0.3.2 pet soundcard oscilloscope  

mister_electronico wrote:
Xoscope is a nice oscilloscope works for linux and works through sound card.

I made this pet, and is working in puppyslacko 5.6 PAE, please if someone use please report to me.

You must install the package libcomedi_0.8-5.pet.


All packages are lightweight


I have a signal generator hat uses sound card outputs. Maybe if there is interest, I will make something nicer out of it and may a pet. I'll check back in a while to look for comments

Also, I have a clever idea to get high frequencies on a sound card based scope. I'll make a document of the idea if there is interest.
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mister_electronico


Joined: 20 Jan 2008
Posts: 660
Location: Asturias_ España

PostPosted: Sun 16 Feb 2014, 17:48    Post subject: of course it is interesting  

Yes Moose On The Loose, of course it is interesting, I think with one divider circuit frequency we can get more frequency.

Today I was testing the Generator wave program siggen, but when the frequency is over to 4 Khz the sine wasn't too clean.

Is sure we can improve the Generator and Oscilloscope with external circuit.

The next day I'll put the pet of siggen.


Any idea is welcome.

See you Moose On the Loose.
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Moose On The Loose


Joined: 24 Feb 2011
Posts: 528

PostPosted: Mon 17 Feb 2014, 12:58    Post subject: Re: of course it is interesting  

mister_electronico wrote:
Yes Moose On The Loose, of course it is interesting, I think with one divider circuit frequency we can get more frequency.

Today I was testing the Generator wave program siggen, but when the frequency is over to 4 Khz the sine wasn't too clean.


When you set up the sound hardware, you can set the sampling rate. Since almost all sound cards will do fairly fast rates, I suggest moving up to a faster rate. This gives you more points on the curve.

On cheap sound cards, when you get above about 2KHz a full scale sine wave gets a bit of added distortion because the hardware has a slew rate limit. As you start to get anywhere near the limit, the distortion starts to rise.


Quote:

Is sure we can improve the Generator and Oscilloscope with external circuit.

The next day I'll put the pet of siggen.


Any idea is welcome.

See you Moose On the Loose.


An external circuit can be used to "mix down" high frequencies to lower frequencies so that the sound card can be used to digitize bands at high frequencies rather than trying to go for getting a wider bandwidth.

Code:

I = Signal * cos(1MHz)
Q = Signal * sin(1MHz)

Filter I and Q
Connect to Left and Right microphone.


Signals within about 10KHz each way from 1MHz will appear on the Left and Right as signals from DC to 10KHz. Above and below will differ on the phase relationship. The idea I was thinking about here is to make a circuit that is controlled by some other path to set what I called 1MHz to various frequencies to be able to do things like make an RF spectrum.

Another thought is to repeat the experiment many times and tile together the FFTs to make the FFT of the whole signal and then do the iFFT to get the time domain. It requires that the phase of the sin() and cos() generators be based on the start of the "experiment" as their time zero for each run.
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mister_electronico


Joined: 20 Jan 2008
Posts: 660
Location: Asturias_ España

PostPosted: Tue 18 Feb 2014, 08:13    Post subject:  

Hi Moose On The Loose
Yes I was not too worried about my cheap sound card.


It is very interesting the frequency multiplier circuits, which can be done with filters, with tunnel diodes, mosfet ...

Anyway if you want to work for a fixed frequency is very good, but I think it would complicate things if we make a signal generator, which works with a wide range of frequencies.

It may be rather a work with a PLL, there is an affordable and good for beginners PLL which is the 4046.

There are many scheme in internet

http://www.learningelectronics.net/circuits/frequency-multiplier-for-lf_15.html

This way I think we have more control over the entire frequency range.

There are other schemes with 4046 you get about 200 Mhz.

What do you think about this ?

See you
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alloydog

Joined: 03 Mar 2014
Posts: 6

PostPosted: Mon 03 Mar 2014, 13:58    Post subject:  

Hi gents! I find any applications like this interesting. A while back, I installed oscilloscope and spectrum analyser apps for my phone, but wanted something on a PC. I resurrected an old Sony Vaio (1 GHz AMD Athalon with a floppy drive!) and put Puppy Slacko on it.

I have just install the xscope 2.0 application and so far it works nicely - thanks! Just one question so far: Are the other input channels for if you have more than one microphone? So, for this old beast, one mic, one channel.

I intent to use for amateur radio stuff.

I'm on the look out for a spectrum analyser also.

I'm hoping to knock up something that will allow it to monitor low HF, say upto 10 MHz, with some sort of frequency converter. I'll keep you posted.

regards

Rob
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mister_electronico


Joined: 20 Jan 2008
Posts: 660
Location: Asturias_ España

PostPosted: Wed 05 Mar 2014, 08:42    Post subject: xoscope  

I think you only have the ability to only 2-channel microphone to the sound card.

Maybe if you could put another sound card or a sound card with multiple microphone inputs.

In the input device (menu) has possibility for other devices, Bitscope, Probescope, Comedi but never use.


See you.
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alloydog

Joined: 03 Mar 2014
Posts: 6

PostPosted: Wed 05 Mar 2014, 09:01    Post subject: Re: xoscope  

mister_electronico wrote:
I think you only have the ability to only 2-channel microphone to the sound card.

Maybe if you could put another sound card or a sound card with multiple microphone inputs.

In the input device (menu) has possibility for other devices, Bitscope, Probescope, Comedi but never use.


See you.


No worries: I would only need one channel, possibly two anyway.
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Rodney Byne

Joined: 31 Jan 2014
Posts: 39

PostPosted: Mon 10 Mar 2014, 03:30    Post subject: xoscope and analyser  

To mister_electronico & others:

Thanks for your posts.
I have had xoscope working ok in an old Linux Mint 8
on a netbook and now in Quirky 6.1.4. via a flashdrive
on a laptop.

For an analyser, I found Linux Baudline to be excellent.
Its operational content has good documentation.

Regards.
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Rodney Byne

Joined: 31 Jan 2014
Posts: 39

PostPosted: Mon 10 Mar 2014, 04:32    Post subject: xoscope and analyser  

To mister_electronico & others:

Thanks for your posts.
I have had xoscope working ok in an old Linux Mint 8
on a netbook and now in Quirky 6.1.4. via a flashdrive
on a laptop.

For an analyser, I found Linux Baudline to be excellent.
Its operational content has good documentation.

Years ago I tried extending the sound card range
with a divide by 10 circuit, using ic 74LS90N & 5v supply.

After breadboarding it, I realised it needed at least
4v pk-pk square wave to drive the chip hard enough
for any output. Not very practical.


Regards.
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mister_electronico


Joined: 20 Jan 2008
Posts: 660
Location: Asturias_ España

PostPosted: Mon 10 Mar 2014, 14:40    Post subject: Hi Rodney  

Hi Rodney Byne, thank you very much for the program Baudline not know him and have operated in the Puppy and works perfectly.

I will make the pet and bring it.

With respect to 74LS90N, I think to be digital, analog signals with the use is more complicated.

I see better with mixer frequencies as do the superheterodyne receivers.

Fs = Fp - Fosc

I think it's not too complicated for no very high frequencies.

Rodney Thank you for your post
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mister_electronico


Joined: 20 Jan 2008
Posts: 660
Location: Asturias_ España

PostPosted: Mon 10 Mar 2014, 15:30    Post subject: Hi Rodney  

Hi Rodney, I spent some time recording Psicofonia, and later when you wanted to detect a voice recording in 16 hours, this was a good job.

With baudline be easier to detect the voices of the dead in a big frame of audio ....In the spectrogram.... Lol

See you.
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Rodney Byne

Joined: 31 Jan 2014
Posts: 39

PostPosted: Tue 11 Mar 2014, 04:39    Post subject: Baudline oscilloscope  

Hi mister_electronico,

You seem to be a clever man,
when you write the pet for Baudline,
could you also look closely into the
original code and find a way to auto-trigger
the "display - waveform" or oscilloscope
to give a stationary waveform.

I noticed this years ago when I was testing
a homemade audio oscillator and found
it wasn't possible to make the sine wave
display still or locked.

Thanks, will look forward to your findings.
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Rodney Byne

Joined: 31 Jan 2014
Posts: 39

PostPosted: Tue 11 Mar 2014, 12:03    Post subject: Very lightweight spectrum analyser  

Hi to mister_electronico & others,

Further to Baudline and on the subject of audio spectrum analysers, yes there are any number of them to be found online,
mostly those in Windows that have to be installed.

I stumbled upon this nice "bare bones" Windows one (324k),
included in a web page trio of audio tools that can be
carried, portable on a flashdrive if you like.
It and they are exe file(s) and just run when clicked,
no need to be installed.

Found on:
http://www.techmind.org/audio/index.html

So I just wondered, if for the compiling folk around, they might
also be useful as convertible to pets, for Puppy fans.

Regards.
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