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Old 8th July 2004, 06:41 PM   #1
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Default 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
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Old 8th July 2004, 08:43 PM   #2
Fenris is online now Fenris  United States
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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.
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Old 9th July 2004, 12:02 AM   #3
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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
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Old 14th May 2007, 08:31 PM   #4
daviswe is offline daviswe  United States
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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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