Sound card as PC oscilloscope

[Chilton]

hello i am interested to know about how can i built PC based digital oscilloscope using sound card. i read at somewhere but i dont know how to make it i am just enthusiastic to know about it so please any one know please tell me.thank you.

[Fabian]

with PCScope application you can use the Sound Importer module along with Plot module to make a fully functional PC based digital oscilloscope using sound card. The mic input of the sound card can be used to probe real signals. The sound card digitizes the input signal and the SoundImp module can acquire the digitized signal from the sound card ,so download PCScope and install it.

Feature:

* Dual channels use stereo inputs of the sound card.
* View any number of channels simultaneously from CH1, CH2, CH1+CH2, CH1-CH2 and CHxCH2.
* Independent manual or auto control of vertical gain, offset and position of each channel.
* Horizontal scale and offset allow for zoom-in of the acquired data in auto or manual mode.
* Free running (Auto) and triggered (Normal) modes.
* Edge trigger on rising, falling or both edges.
* Trigger source channel can be either CH1 or CH2.
* Adjustable trigger position from 0% to 100% lets you view pre-trigger and post-trigger data.
* Selectable record length (Number of samples per acquisition) from 10 to 1M.
* Selectable sample rate upto 192 KSPS.
* Dual manual horizontal cursors with delta.
* Dual automatic or manual vertical cursors with delta.
* Single, Run/Stop, number of acquisitions and time duration acquisition modes.
* Setup save and recall.
* Waveform save in ascii format.
* Controls can be aligned to top, bottom, right or left of the window for ease of use.

[deoWo]

Zelscope is a Windows software that converts your PC into a dual-trace storage oscilloscope and spectrum analyzer. It uses your computer's sound card as analog-to-digital converter, presenting a real-time waveform or spectrum of the signal - which can be music, speech, or output from an electronic circuit. Zelscope features the interface of a traditional oscilloscope, with conventional gain, offset, timebase, and trigger controls. As a real-time spectrum analyzer, Zelscope can display the amplitude and phase components of the spectrum. go here and try it http://www.zelscope.com/

[Killen]

A sound card oscilloscope will have around 100KHz bw, which is usable for most audio signals and it is a good usable range for analog electronics. It has 3 basic problems:

1) With frequencies less than around 10Hz, you will not able to identify signals . Also distortion will occur by the AC coupling capacitor for lower frequency below 20Hz
2) Sound cards have an input impedance that varies around 1KOhm. This means that a circuit with a small signal will not be able to read it. you can use pre amplifier to fix this.
3) Sound cards can only safely read around 1.3V peak to peak so try here scaling the signal

[McDavid]

This sound card oscilloscope probe seems to be able to solve the problems of impedance matching, over-voltage protection and limited measurement range.

http://www.virtins.com/Virtins_Sound...obe_Manual.pdf

[RoninBlade]

You can use the Sound Importer module along with Plot module to make a fully functional PC based digital oscilloscope using sound card. The PC-Oscilloscope receives its data from the Sound card with 44.1kHz and 16 Bit resolution. The data source can be selected in the Windows mixer (Microphone, Line-In or Wave).