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Quote Oscilloscope V2.51 (freeware) for Windows is a Windows application that converts your PC into a powerful dual-trace oscilloscope. Oscilloscope uses your PC's sound card as an Analog-to-Digital Converter (ADC) to digitize any input waveform (speech, music, electric signal, etc.) and then presents it on the monitor in real time, allowing the user to control the display in the same way as on a conventional 'standalone' scope, for example change gain, timebase or plot Lissajous patterns. Main features: Any sound card can be used Single trace, dual trace and XY modes Spectrum analyzer (realtime, built-in) 20 kHz bandwidth Triggering Point-and-click meter function Storage mode Data export to Windows clipboard or disk file System requirements: The current version of Oscilloscope, V2.51, requires a 80486 or higher PC running Windows95. A stereo sound card with drivers installed is required (either 8- or 16-bit).

I have just downloaded Oscilloscope.zip from here, and tested. No errors detected in compressed data of Oscilloscope.zip. The oscilloscope with a Wheatstone bridge configuration. The Wheatstone bridge is a very useful circuit.

When the bridge is fully balanced, the right side resistors identical to the left side resistors (R1=R3, and R2=Rx), the voltage across the bridge is zero. However, with a small change in resistance on one of the resistors, and the bridge becomes unbalanced, and a voltage difference appears. Wheatstone bridge are used in all sorts of sensor devices such as strain gauges, pressure gauges, etc.

A differencing amplifier can be used to extract the common mode signal, while rejecting all of the common mode noise. As a result very small signals and changes can be extracted from the bridge, because common mode noise is easily rejected.

Ref: The X and Y are connected to a simple, but accurate frequency oscillator circuit. A low-frequency oscillator (LFO) is an electronic oscillator that generates an AC waveform at a frequency below ˜20 Hz. This term is typically used in the field of audio synthesizers, to distinguish it from an audio frequency oscillator. Better still, a Voltage-controlled oscillator.

Wheatstone bridge. I would gladly provide my license of TrueRTA level 4, which I have not used in over a year, but it's under my real name. The only difference is that it lets you drill down to 1/24th of an octave using the RTA, and it allows quick sweeps. Not sure that any of it is even relevant in this case. There are several USB to PC oscilloscope modules available now-a-days. The Vellemann one, which I own, is OK as long as the voltage is kept under 50V.

Only one channel. 'NEEWER Hantek PC Based USB Digital Storage Oscilloscope 6022BE' might also work. (not tested) Also, before buying a Vellemann, look into the Oswon digital oscilloscopes. (own one) - very neat, and has USB connectivity. I use it in my other hobby (speakers and car audio stuff) I realize that the thread is old and that's likely why that bit of info was missing.

A little background on the kind of signal to be measured, and I could provide more accurate suggestions.

Home TrueRTA 's audio spectrum analyzer software shows you a detailed picture of what you're hearing in real-time, that is, as it happens. All you need is a Windows PC with basic sound capability. The test instruments found in TrueRTA include: ● Real Time Audio Analyzer ● Low Distortion Signal Generator ● Dual Trace Oscilloscope ● dB SPL, dBu and Crest Factor Meters WinSpeakerz is a loudspeaker simulation program. This popular speaker simulator lets you propose various speaker systems and then evaluate them in software before you cut wood or order expensive transducer components. ● Customize your Driver Library ● Box Calculators ● Crossover Calculators Introduction to Loudspeaker Design is written for students, technicians, engineers and hobbyists seeking an overview of the technology of loudspeakers. Topics include: ● Loudspeaker Design Tradeoffs ● Spatial Loading ● Diffraction Loss ● Cavity Effect ● Enclosure Construction DATS measures loudspeaker parameters or passive component values in just seconds and even includes our unique impedance based Rub and Buzz test. ● Measure Speaker Parameters ● Perform Rub and Buzz Testing ● Measure R, C and L values ● Generate Audio Waveforms.