[sdiy] protection circuit at audio output

[Michael Buchstaller]

>I've lately been using my old Commodore 64 computer for making music. I dig 
>the sound of its Sound Interface Device (SID)-chip. I'm planning to build a 
>special cable for connecting the SID's audio output to my mixer. However, 
>I've heard that the SID can possibly be killed by turning off the mixer 
>where it is connected. This might be because of a voltage spike....

Do you plan to take the audio output directly from the SID chip in the C64,
or just go and use the DIN connector at the C64´s rear ?

Direct connecion would require caution, and you will have a DC offset of
several volts.
But if you use the connector, you are save - the C64 uses a transistor
follower, so this is taken care of.

-Michael