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Unread 06-02-2004, 12:01 PM   #1
cristoff
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Default Wiring up something... need help

I am making a sound mixer of sorts... inputs are cd player, mic's, tape player... all needing to go to an output of a master volume knob...

I was wondering if it be possible to use something so that the sound doesn't travel backwards... the power of the sound i guess is what i mean...
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Unread 06-02-2004, 12:49 PM   #2
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?!?

You normally mix the various lines before amplifying it. What do you mean by "sound doesn't travel backwards"?
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Unread 06-02-2004, 12:56 PM   #3
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the power travel back up the other line...

what i mean is i am pre mixing... creating a mixer then amping the output...
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Unread 06-02-2004, 02:55 PM   #4
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Ah, you're talking about isolating the various inputs from each other?
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Unread 06-02-2004, 03:44 PM   #5
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You'd need to make an amplifier circuit. At the minimum, something along the lines of a variable gain diffence amp for each input, then feeding those into a summing amp.

In case you have no idea what I'm talking about, National Semiconductor has some good app-notes for their op-amps. Start with AN-20 "An Applications Guide for Op Amps".

If you value your time and audio quality, buying something professionally made is best.
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Unread 06-03-2004, 06:34 AM   #6
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Radio Scrap sells these pretty cheap, and work fine: it was my first one.
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