[Ham-Mac] Sound Card

[Philip]

Rumor has it that Chris wrote:

> >Duffey,
> >
> >You may not have a problem. Check your TS-850 manual on the output
> >impedance on the 13-Pin ACC2 plug.  The problem seems to be unique to
> >the 4.7 k ohm TS-570 output. I look forward to your feedback and
> >please document the TS-850 impedance.
> 
> That seems somewhat surprising, as I have taken audio output from a 
> variety of radios, with output impedances of 4 ohms (directly from a 
> headphone jack), 600 ohms, as well as 10k ohms. The problem, if there 
> is one, is not related to the output impedance.  A review of my 
> previous email will explain why this is the case, as we are not 
> trying to optimize power transfer.

I am not an engineer, but I deal with audio professionally. Chris is
right on this one. As long as the input impedance is high and the output
is lower effectivly all modern circuit are happy. If the output is
unhappy, just add a load resistor. For a speaker out I would pick
something like 20-50 ohms. That should cause enough current flow for the
output to be happy but not drag the voltage down much so the input will
still have enough to work with.


--
        Philip          73, de
                        KB0SWA