Re: OK to use TV coax for microphone?

"Martin Griffith" <mart_in_medina@[EMAIL PROTECTED]
> wrote in message 
news:sh9p14hjdd2992avksh5uaiuhnset5vnek@[EMAIL PROTECTED]
> On Sat, 3 May 2008 17:01:19 +0100, in sci.electronics.design Ian
> Jackson <ianREMOVETHISjackson@[EMAIL PROTECTED]
> wrote:
>>
> 600 ohms is dead and buried, for the audio world.The only time it is
> mentioned is in data sheets, "will drive XXdB into 600R" etc
>
>
> martin

Quite so. The concept of matching a microphone's impedance to get the best

power transfer has not been practiced for a considerable time.
Modern dynamic mics expect to look at a "bridging" impedance e.g. around
10K 
for a mic having a Z of 150-200 Ohms and to operate as a voltage, rather 
than a power source.
The characteristic imedance of the feeder (over a few feet) may thus be 
disregarded.


Les.