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janklug 29th September 2004 01:21 PM

basic audio mixer (4 channels to 1)?

i'm new to this forum (and basically to audio electronics, too, so please forgive any newbie mistakes ;-) )

i'm planning to build a very basic audio mixer, that should combine 4 channels (2 dynamic mics, 2 line level instruments) to 1 line level channel.

the level of the in's should be set individually, and i'd like to have a master fader, too.

i've searched the internet & found several designs that (more or less) seem to fulfil these wishes; unfortunately, i don't know the used amplification methods & their pros/cons, so i can't decide what solution would sound & work best...

does anybody have any idea wich of the following schematics to prefer, and/or answers to the related questions on that design?
any help greatly appreciated! (looks like the best choice to me)
(question 1: do i need the full 'input module' also for the line level inputs?
question 2: what can be omitted to make it just a mono out?)
(question on this: Audio Taper pots - are that just logarithmic pots?)
(- question 1: does it need 9V power, or is that +9V / -9V symmetrical power? just heard of the existance of symmetrical power today ;-)
-question 2: what kind of caps are those? the 100uf seem to be polarized, but what about the 10uf at the outputs?!)
(question 1: what are those opAmps? which model to choose for that?
question 2: this actually USES a symmetrical 9V power source, right?)

well, i found more, but these seemed to be fitting best.

thanks & greetings,


rfbrw 29th September 2004 06:46 PM

You would be better served posing this question in the analogue forum.

janklug 29th September 2004 06:51 PM


Originally posted by rfbrw
You would be better served posing this question in the analogue forum.
ah, thanks for the tip!



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