Please review this mono-summing

regal · 11th August 2006, 11:47 PM

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?

poobah · 11th August 2006, 11:58 PM

Depends on what you are connecting to.

regal · 12th August 2006, 01:48 AM

I will be adding this to the output of my DIY tube preamp, going to a home theater reciever

edjosh23 · 12th August 2006, 04:20 AM

I have 20 of those things... I've been wondering what I should do with them.

Josh

CarlosT · 8th November 2006, 10:00 PM

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.

davidlzimmer · 18th November 2006, 02:34 AM

Seems to me, you summed them at the 26k resistors. What purpose does the op amp serve? Gain? Impedance matching? Just curious.

18th November 2006, 02:34 AM	#6
davidlzimmer diyAudio Member Join Date: Jan 2006 Location: Fairmount, GA	Seems to me, you summed them at the 26k resistors. What purpose does the op amp serve? Gain? Impedance matching? Just curious. __________________ Poor stereo mix? Switch to mono! Perfect.

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11th August 2006, 11:58 PM	#2
poobah diyAudio Member Join Date: Nov 2005	Depends on what you are connecting to.

12th August 2006, 01:48 AM	#3
regal diyAudio Member Join Date: Jan 2004 Location: MD	I will be adding this to the output of my DIY tube preamp, going to a home theater reciever

12th August 2006, 04:20 AM	#4
edjosh23 diyAudio Member Join Date: Oct 2004 Location: Raleigh/Atlanta	I have 20 of those things... I've been wondering what I should do with them. Josh

8th November 2006, 10:00 PM	#5
CarlosT diyAudio Member Join Date: Oct 2006	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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