[sdiy] Kraakdoos line out

[Ian Fritz]

At 06:56 PM 5/20/05, Metrophage wrote:
>No dice!

Aww ... too bad!  Still, there has to be something simple that will work.

>What you suggested, Ian is indeed what I usually associate with audio
>output circuits, trying to keep the voltage managable and remove DC.
>And now I have >some< idea how this is supposed to work.
>
>Whereas it is good for other circuits, it does not work for my
>Kraakdoos. More accurately, the output does work, but it changes the
>behavior of my Kraakdoos so much that it is almost unplayable. I have
>been getting a variety of sounds out of this thing - but when I connect
>the new output jack to a mixer or soundcard, the Kraakdoos output
>changes to a fairly constant buzz which does not change very much as it
>is handled.

Are you saying that the added cap and resistors themselves do not hurt the 
operation, ie there is only a problem when the cable is also connected?

>I was hoping this solution would have worked, but I need to think of
>something else!

The next step might be to add an FET source follower between the opamp and 
the big cap.  With two FETs and two resistors you can make a high impedance 
buffer with no offset voltage.  Wouldn't take up much room!

   Ian