ANALOG/ DIGITAL .NOISE

[Fritz Oppliger]

In a ribbon cable I have analog signals on one side, digital stuff on the
other edge. I found the digital traffic was influencing the analog so I
went to a wider ribbon cable. better separation. Now I have a couple of
unused conductors in the middle.

Do I connect these unused wires to:
analog ground
digital ground
earth ground
leave unconnected

If this looks like homework, well it IS, in my homebrew electronics
self-education.
I could have the connections jumper- selectable.
from the sublime to the ridiculous.
I value your opinions first.
Thank you.

--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

 

[Michael A. Covington]

I would vote for analog ground.

"Fritz Oppliger" <invalid@nospam.biz> wrote in message
newspsdis7kqrmze7ge@free.teranews.com...

In a ribbon cable I have analog signals on one side, digital stuff on the
other edge. I found the digital traffic was influencing the analog so I
went to a wider ribbon cable. better separation. Now I have a couple of
unused conductors in the middle.

Do I connect these unused wires to:
analog ground
digital ground
earth ground
leave unconnected

If this looks like homework, well it IS, in my homebrew electronics
self-education.
I could have the connections jumper- selectable.
from the sublime to the ridiculous.
I value your opinions first.
Thank you.

--
Using M2, Opera's revolutionary e-mail client: http://www.opera.com/m2/

 

[Rich Grise]

Fritz Oppliger wrote:

In a ribbon cable I have analog signals on one side, digital stuff on the
other edge. I found the digital traffic was influencing the analog so I
went to a wider ribbon cable. better separation. Now I have a couple of
unused conductors in the middle.

Do I connect these unused wires to:
analog ground
digital ground
earth ground
leave unconnected

If this looks like homework, well it IS, in my homebrew electronics
self-education.
I could have the connections jumper- selectable.
from the sublime to the ridiculous.
I value your opinions first.
Thank you.

If you have more than one wire in the middle, use half for digital

ground and half for analog. If there's an odd number, digital gets
the odd one.

Cheers!
Rich