simple 2->1 mixer

amacks · 8th July 2004, 06:41 PM

[warning newbie question]
I'm trying to build a device that will combine 2 headphone-level stereo signals into one headphone-level output, some loss of signal strength is acceptable. Am I correct that a resistor on each of the hot legs of each of the puts will do the trick?
tia
Aaron

Fenris · 8th July 2004, 08:43 PM

A better option would be a pair of op-amps per input set in unity gain (buffers). This would prevent signal bleed-through between channels. Each of the headphone level outputs would get a buffer and then after the buffer the signals could be combined.

officeboy · 9th July 2004, 12:02 AM

I won't touch the op-amps being better, but the simple resistor trick will work.

A little more info here.
http://www.hut.fi/Misc/Electronics/c...s/linesum.html

daviswe · 14th May 2007, 08:31 PM

I like the idea of using unity-gain (or even gain controlled) buffers (amps) since the signal levels are below the power supply levels of 12V (in the application I'm considering).

Would you use a simple unity gain mixer stage after the buffers, in other words, two buffers to the non-inverting input of a single op amp? This could all be done on a 4-amp chip.

Ed

8th July 2004, 06:41 PM	#1
amacks diyAudio Member Join Date: Jan 2003 Location: Boston, MA	simple 2->1 mixer [warning newbie question] I'm trying to build a device that will combine 2 headphone-level stereo signals into one headphone-level output, some loss of signal strength is acceptable. Am I correct that a resistor on each of the hot legs of each of the puts will do the trick? tia Aaron

8th July 2004, 08:43 PM	#2
Fenris diyAudio Member Join Date: Jun 2004 Location: The last frontier	A better option would be a pair of op-amps per input set in unity gain (buffers). This would prevent signal bleed-through between channels. Each of the headphone level outputs would get a buffer and then after the buffer the signals could be combined. __________________ Listen to the music through the stereo, not the stereo through the music.

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9th July 2004, 12:02 AM	#3
officeboy diyAudio Member Join Date: Nov 2003 Location: NW Washington	I won't touch the op-amps being better, but the simple resistor trick will work. A little more info here. http://www.hut.fi/Misc/Electronics/c...s/linesum.html

14th May 2007, 08:31 PM	#4
daviswe diyAudio Member Join Date: May 2007	I like the idea of using unity-gain (or even gain controlled) buffers (amps) since the signal levels are below the power supply levels of 12V (in the application I'm considering). Would you use a simple unity gain mixer stage after the buffers, in other words, two buffers to the non-inverting input of a single op amp? This could all be done on a 4-amp chip. Ed

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