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Old 11th August 2006, 11:47 PM   #1
regal is offline regal  United States
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Default Please review this mono-summing

I can't believe there are no commercial RCA stereo to mono summing boxes.

Please look at this circuit. Do I need a DC blocking cap on the output?
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Old 11th August 2006, 11:58 PM   #2
poobah is offline poobah  United States
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Depends on what you are connecting to.
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Old 12th August 2006, 01:48 AM   #3
regal is offline regal  United States
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I will be adding this to the output of my DIY tube preamp, going to a home theater reciever
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Old 12th August 2006, 04:20 AM   #4
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I have 20 of those things... I've been wondering what I should do with them.

Josh
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Old 8th November 2006, 10:00 PM   #5
CarlosT is offline CarlosT  United States
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Not to hijack this thread but I have a related issue. I'm trying to combine the outputs of an iPod/MP3 player into a single mono channel to feed a non-inverting LM3875 chipamp. Would a simple 10K ohm resistor in line with each + input work before summing the channels? I'm looking to do the simplest thing that'll keep me outta trouble.

Something like this...

http://www.epanorama.net/circuits/linesum.html

Does the fact the the chipamp kit is non-inverting have anything to do with anything for summing channels?

Thanks.
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Old 18th November 2006, 02:34 AM   #6
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Seems to me, you summed them at the 26k resistors. What purpose does the op amp serve? Gain? Impedance matching? Just curious.
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Poor stereo mix? Switch to mono! Perfect.
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