Oscilloscope D.I.Y

Soundcard Oscilloscopedeutsche Version

Author: Christian Zeitnitz
Main features:
The PC based Soundcard Oscilloscope receives its data from the Soundcard with 44.1kHz and 16 Bit resolution. The data source can be selected in the Windows mixer (Microphone, Line-In or Wave). The frequency range depends on the sound card, but 20-20000Hz should be possible with all modern cards. The low frequency end is limited by the AC coupling of the line-in signal. Be aware, that most microphone inputs are only mono.
The oscilloscope contains in addition a signal generator for 2 channels for sine, square, triangular, sawtooth wave forms and different noise spectra in the frequency range from 0 to 20kHz. The signal can be defined by a mathematical formula as well. The signals are available at the speaker output of the sound card. These can be fed back to the oscillocope in order to generate Lissajous figures in the x-y mode.
Download the latest version: scope V1.46
Obtain a commercial license here
Interested in a customized version?

Support the development of this program by obtaining a private donation license

Additional features

• Trigger modes: off, automatic, normal and single shot
• Triggerlevel can be set with the mouse
• The signals of the two channels can be added, subtracted and multiplied
• x-y mode
• Frequency analysis (Fourier spectrum)
• Waterfall diagram (frequency spectrum as function of time)
• Frequency filter: low-, high-, band-pass and band-stop
• Cursors to measure amplitude, time and frequency in the main window
• Audio Recorder to save data to a wave file
• For multi soundcard system, the used card can be selected in the settings tab

The program has been written in LabView (™ by National Instruments). For the actual Sound I/O part the WaveIO package by the same author has been used. 

Signal Sources

The signals for the oscilloscope can be internal to the computer (MP3 player, function generator etc.) or from external sources (line-in, microphone). For external sources care has to be taken, not to exceed the voltage range of the inputs. The range is usually only ±0.7V !! If higher voltage need to be analyzed, a voltage divider has to be used. Additional protection diodes are recommended in order to avoid any damage to the sound card and to the computer. 

Requirements

This program will run on Windows 2000/XP/Vista/7/8 (32bit and 64bit) computers with a sound card. It will not install on older versions of Windows. The speed requirements are not very hard. A 1GHz machine is suffient. On slower CPUs the load on the system might lead to reduced responsiveness of the system.

Terms of usage and licenses

This Software and all previous versions are NO Freeware!

• The use of the software and of the documentation is granted free of charge for private and non-commercial use in educational institutions
• Any commercial application requires a corresponding license (see below)
• Distribution and sale of the program is prohibited. Contact the author in order to obtain a resale license.

If you like to support the further development of this program please obtain a private license by following this link
Commercial usage: In order to obtain a commercial license follow this link
All right reserved.

The signal generator is utilizing.

Downloads

Instructions: The program comes as a self-extracting archive and will start the installation automatically. After the installation start the scope from the entry in the program menu. Enjoy !
Version 1.46

• Changes
  • Improved mouse control of the amplitude measurement: after the acquisition is stopped (Run/Stop) a right click into the scope window starts the measurements. A left click positions the cursor on the time axis. The left and right cursor keys allow a fine adjustment of the cursor
  • Mouse control of measurement in the frequency window: left click positions the cursor on the frequency axis. Fine adjustment with the left and right cursor keys
  • Expert mode allows to modify the sampling rate within the program and direct access to the configuration file
  • Solved CPU load problem for long time window
  • Memory problem solved
  • One more crash problem solved when running under Windows 2k/XP behoben
• Version 1.46 of the program (all languages): scope_146
• Only the englisch manual für Version 1.46
• License
  • All licenses obtained for previous scope versions are valid for this version as well
  • Private license to support the further development of the program
  • Commercial license for the usage in companies and non-public educational institutions

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+Older versions

Final Remarks

The program requires a correctly installed and configured soundcard on your Windows computer. In case of problems consult the manual and the frequently asked question.
If you still have a software related problem send mail to C.Zeitnitz

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