SV: [sdiy] scope recommendations wanted (or even "wtb: scope in england")

[Seb Francis]

WeAreAs1 at aol.com wrote:

>Unfortunately, soundcard-based scopes will only measure AC signals.  This is 
>because all soundcards are AC-coupled at the inputs (with coupling capacitors, 
>which block all incoming DC).
>  
>

Of course this is something that can be fixed by modifying the soundcard 
and adding a small external circuit..
http://www.qsl.net/om3cph/sb/dcwithsb.htm

In any case when using a soundcard you should at least have an external 
buffer circuit since the impedance of a soundcard is very low compared 
to a scope and will tend to influence what you are trying to measure.

Seb