Don Pearce wrote:
On 01 Dec 2009 20:04:14 GMT, mick wrote:

On Mon, 30 Nov 2009 21:09:48 +0000, Ian Bell wrote:

I need to send an audio signal from a 50K ohm source over a distance of
a couple of feet in a screened cable. However, most audio coax seems to
be about 100pF/ft so 2ft of this and 50K will turn over just below
16KHz. So, anyone know a source of low capacitance audio coax?


Does it have to be coax? Have you tried a simple twisted pair? That isn't
a great distance - you may get away with it and the capacitance can be
lower than most coax cables.

Twisted pair won't help much at these impedances; pickup will be
mostly electrical rather than magnetic. Shielding is the thing. On the
other hand, if the signals levels are high on this lead, that may not
be a problem either.

d


That's right, I am more concerned about crosstalk than interference.

Cheers

Ian