This link has been bookmarked by 8 people . It was first bookmarked on 05 Aug 2007, by York Jong.
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06 Jul 08
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27 May 08
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05 Aug 07
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These soundcards often contain powerful analog/digital converters, able of up to 100 ksamples per second at 16 bit or more.
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When using the soundcard as an oscilloscope, the low input impedance is a large disadvantage.
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The bandwidth of the oscilloscope is limited to at max half the sample frequency, i.e. to audio signals below approx. 20kHz for a standard sound card.
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Since the signals are ac coupled, the lower frequency limit of this adapter is limited to about 16mHz.
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The circuit consists of a large bandwidth voltage follower built around a CMOS operational amplifier CA3140. The circuit is not sensitive to the type of the used opamp as long as the input resistance is sufficiently high. In order to simplify the design, a single-voltage operational amplifier should be preferred.
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