3 channel quad mixer with front to rear pan - diyAudio
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Old 15th February 2014, 06:21 PM   #1
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Join Date: Feb 2014
Location: Bucharest
Default 3 channel quad mixer with front to rear pan

Hi,

I have some electronics history, but audio is way above my head. this is why I would appreciate your input in my latest project.

I will end up with a quad amplifier based on 2xSTK463 and currently I'm designing the mixer stage. the idea is to be able to use front + rear output from a PC, a spdif -> DAC output and a random line out, control their volume via a few PGA2311s, mix them all up with some OPA2134s and deliver that to the final amplifier. also one of the PGAs is supposed to pan the sound from front to back in case we only have stereo input.

https://raw.github.com/rodan/ampy/ma...ware/mixer.png

can someone please tell me if I do something wrong in this circuit?

also the OPA2134's datasheet talks about increased distorsion in case of "unmatched source impedances greater than 2k". is there something to be done about this as far as those buffers are concerned? since have no idea of the output impedance of a PC soundcard or a black-box spdif DAC. the above image only contains the audio path for the mixer. the rest of the project is being developed here: https://github.com/rodan/ampy

thanks.

Last edited by petertux; 15th February 2014 at 06:54 PM.
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