combining stereo audio into mono
I picked up this little radio shack 4-way a/v switch box and I want to modify it to output mono audio with the R and L channels combined. It shouldn't be hard to do, but I've seen this done two ways. One way with just two resistors (usually a few hundred ohms each) one on the R and one on the L tied together. The other with an additional resistor (of about 10x higher value) between the combined output and ground. I'm guessing it sort of makes a voltage divider and fixes the output at a certain level. Which method works best?
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My preference is using a mono-blending transformer.
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Quote:
The outputs from older tube gear are often much higher impedance and would require higher "mixing" resistors to make a proper passive mixer/combiner as their output impedances can often be up in the hundreds of thousands of ohms. |
I use an adapter I got at walmart,it just combines 2 channels into 1.... Works very well!!!
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I typically just short both channels together, when working with line-level signals. I have seen a stereo amplifier stereo/mono switch wired that way.
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Hi to all,
Hi Adam, here is a simple resistor combiner to convert stereo to mono (photo). from the web site of one of our french radio forum members. Full article : http://www.radioman33.com/pages/mes-...prise-p-u.html This second adapter using a transistor radio small driver transformer is used for chassis isolation ("hot chassis") when feeding the phono input of a vintage tube radio. Not necessary in your case. http://www.radioman33.com/pages/mes-...3-sur-p-u.html Best Regards jhalphen Paris/France |
Yes, these simple resistor channel mixer are fine for this application.
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