Stereo to mono input

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Hi all,
I have the following problem.

I built a small radio based on a mono FM tuner and a single channel amplifier. The output goes to a single speaker. Now I would also add an input for a CD, but don't want to add another amplifier and speaker, so I was thinking of converting the CD stereo output into a mono signal that can feed the (mono) amplifier.

I found the schematic for this solution (see photo), but would like to know if it is good or there are other better solutions not too complicated. If it is the correct way, are 1/8W resistors OK?

Thanks,
Ralf
 

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