We that have responded understand your dilema. You will not destroy your
discrete stereo with the passive resistor method. The stereo output impedances,
are typically 10k although I believe they are a good bit lower. I repeat, you
will *not* mar the quality of the stereo. That's the reason for the resistors.
They passively sum the audio together. The resistor to ground simply provides a
low mono impedance that reduces crosstalk. I do what you are trying to do in
many instances at home and at the radio station I engineer at.

Use the following:
http://www.pic101.com/pix/MIX.GIF

Rick

Tal wrote:

> Hello and thanks for the help
>
> To many times I do the same error and ask a question with some lack in
> details.
>
> I have a stereo satellite receiver and a stereo TV and a mono video
> cassette, so I want to be able to enjoy watching/listening in stereo but
> record in mono but have both L+R lines. I never do that before and it look
> to me if I use 2 resistor in series to join the stereo I will destroy the
> stereo signal.
>
> I know when you want to separate a dc sources or join them you can use a
> diode/s but in this case it looked to me to distorted and not acceptable. so
> AC signal give you an headache... furthermore you don't want to kill the
> sound.
>
> I think I will adopt the buffer idea and try it.
>
> Thank you all for you help!
>
> Tal
>
> --

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