Would you like a free oscilloscope and spectrum analyzer?

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Would you like a free oscilloscope and spectrum analyzer?

Postby vanessa » 20 Jan 2008, 23:08

Got a Sound card built into that thing? Download here,

http://www.sillanumsoft.org/
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Postby jt » 21 Jan 2008, 07:18

Thanks Vanessa,I will give it a try.
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Postby marshmellow » 21 Jan 2008, 18:37

Cool, I always wanted to try that with the soundcard. I didn't even get the idea there could be already software for that :roll:.
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Re: Would you like a free oscilloscope and spectrum analyzer?

Postby modman » 27 Aug 2008, 00:19

I get the idea, but don't understand how it's done hardware-wise. Could somebody explain how to hook up the circuit to the soundcard?

thanks
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Re: Would you like a free oscilloscope and spectrum analyzer?

Postby pz » 29 Aug 2008, 09:28

If you'd like to use the software function generator first mute the Line In in the soundcards playback mixer.
Then:
- connect the line out to your FX input
- connect the output of your FX to the line input of the souncard.

To mimic the guitar amp input and to protect the lineIn on the soudcard i'd use some opamp based 1M input Z buffer with protection diodes, or even better - instead of the 1M resistor i'd use a 1M log pot to have the input level control.

I'm using the VisualAnalyser for some time and it's simply great for developing low frequency (<audio band) circuits.
As an example, here's a yt movie i did once, its an OD based on Arsenio Novo's circuit:
http://www.youtube.com/watch?v=hRQMZqgSnK0
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Re: Would you like a free oscilloscope and spectrum analyzer?

Postby Bside2234 » 27 May 2009, 05:04

I too have been trying to figure this out.

So your saying you connect the Line Out on the computer to the FX input.
Connect the FX output to the Line Input of the soundcard/computer.

I thought I would try to use my audio interface (Tascam US-122L) with a guitar cable I clipped off one end and put an alligator clip on the ground and a probe on the tip. I clipped the alligator clip to the ground and probed around with the probe. It almost seems to work. Am I completely off by doing this? I am getting readings but nothing like a square wave or anything. Do I need to put a signal through the circuit? I did power the circuit up with a battery. Sorry, I never used an oscilloscope before. There doesn't seem to be much instruction on how to actually use it or hook it up.
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Re: Would you like a free oscilloscope and spectrum analyzer?

Postby NickS » 12 Jun 2009, 10:04

Bside2234 wrote:I too have been trying to figure this out.

So your saying you connect the Line Out on the computer to the FX input.
Connect the FX output to the Line Input of the soundcard/computer.
If you are planning to use the built-in Waveform Generator, yes.
As the links on the site for bigger pictures don't work (they refer to local drives), here are the correct links for the pics if you're browsing:
http://www.sillanumsoft.org/images/scope.gif
http://www.sillanumsoft.org/images/spectrum.gif
http://www.sillanumsoft.org/images/Generator1.gif
http://www.sillanumsoft.org/images/Generator2.gif

I thought I would try to use my audio interface (Tascam US-122L) with a guitar cable I clipped off one end and put an alligator clip on the ground and a probe on the tip. I clipped the alligator clip to the ground and probed around with the probe. It almost seems to work. Am I completely off by doing this? I am getting readings but nothing like a square wave or anything. Do I need to put a signal through the circuit? I did power the circuit up with a battery. Sorry, I never used an oscilloscope before. There doesn't seem to be much instruction on how to actually use it or hook it up.
You can put a signal through the circuit using the Waveform Generator, or you can connect something else to the effect input to provide a signal.
Hope that helps.
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