> > Can also be used as a basic, very basic two-channel, logic analyser

> Interesting. How is your setup for this?

I have to admit not doing this myself, merely pointing it out to Lindy as
an inexpensive way to get a useful tool for debugging his circuits. I
should have also mentioned oscilloscope s/w rather than audio s/w.
Dropped the ball there, sorry

But to make a logic analyser should be very simple, assuming normal
5V signals. Feed straight into the soundcard (one signal per channel),
and it would be clipped automatically. This may not be recommended,
so better would be to use a resistive divider to get it down to or below
the input voltage limit of the sound card. Timing is the important function
of an digital analyser rather than voltage (which for digital you know
anyway - 5V) but a sound card has an advantage that a normal analyser
doesn't. You could measure the effect of a digital signal on an analogue
signal, or the analogue's response to a digital signal. For example
converting PWM to a waveform by measuring input and output

The other attractive feature about a PC-based oscilloscope/analyser
is that you could monitor and record both digital/analogue signals in a
PIC circuit for literally hours using the installed RAM and drive space

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