On 10/24/05, Josh Koffman <joshybear@gmail.com> wrote:
> Hi all. Some of you might remember the discussion I started about
> building a mic split a little while ago. I've mulled it over a bunch
> (when I have had a few moments) and decided that building my own just
> isn't economical at the moment. If I was to spend the money to do it
> properly, I might as well buy a system premade. The only thing I gain
> by doing it myself is customizability and the burden of a lot of
> soldering. In addition, since I lack enough mic preamps, I would have
> to buy or build more (not a small task).
>
> Then I had another idea. I think I can pull the audio off of another
> part of the signal chain, after the mic preamps in the console (for
> the curious, I'd build a box that will pull the audio off the insert
> jack, while still allowing inserts on every channel). The problem is
> that on that output, there is the possibility that I wouldn't have
> exclusive use of that signal. So I think I need to use an opamp as a
> high impedance buffer so as not to load down the output.
>
> Questions:
>
> 1. Am I on the right track? If I wanted to "steal" an audio signal,
> would an opamp buffer be the best way to do it with minimal impact to
> the original signal chain?
>
> 2. Any recommendations on how to design a follower that won't effect
> the audio signal too much?
>
> 3. Any better ways to do this that don't involve expensive transformers?
>
> Thanks!
>
> Josh

If you're just trying to run one mic to two mixers, you can plug the
mic into the first mixer, and run a 1/4" unbalanced (e.g. guitar)
cable from the insert to the insert on the second mixer.  Plug the
cable in "halfway" on the first board so the NC switch on the jack
isn't opened and the signal can still go through the first mixer.  If
you need to connect to more mixers, use a Y cable.

Repeat for each channel you need to share.

The mixer should buffer the insert send, so you don't need to do it yourself.

If you need to preserve inserts on the mixers, then just wire up the
box you were thinking of.  No passive or active electronics necessary.
 You'll be in for a lot of soldering, though.  Might be worth making a
PCB for it, to keep your sanity.

Regards,
Mark
markrages@gmail

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