? on Mr Hall Effect

[ECMnut at aol.com]

In a message dated 11/10/98 11:28:48 AM Eastern Standard Time,
rah at horizon.hit.net writes:

> 
>  All of those devices work on transients that are probably too fast to
>  catch with a DVM.  If you have it, you may try feeding it into a sound
>  card and see what the wave really looks like.  Also if you where
>  spinning the disk past the sensor you would be able to detect the
>  level out the output signal (average level) changing, but would owuld
>  not be able to detect any of the waveforms themselves.  You might in
>  the case be able to put the DVM on HZ (if yours had this) and count
>  the number of teeth.
>  
If you get some time, would you explain how this is done?
Most interesting (affordable) tool, that sound card is..
Thx Mike V