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combining signal from microphones...

Started by Dj Task Manager, November 22, 2010, 09:24:23 PM

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Dj Task Manager

Hello all,
I was wondering what the best way is to combine the signal from two microphones.  Some sort of super simple passive mixer I was thinking...  My very basic knowledge of electronics has lead me to speculate on sending the signal of each through a diode so it can only go one way and not loose steam trying to drive the other microphone as if it were a speaker.  Yes, thats right I really dont know what im talking about, hopefully my musing are lol-worthy and not jsut plain tradgic!

Any thoughts?

Cheers!

Mike

untune

Hi Mike,

I don't know if you're intending to build this specifically, but Maplin do a passive 3 channel mic mixer for a tenner if that's any good to you?

http://www.maplin.co.uk/Module.aspx?ModuleNo=36158&C=Froogle&U=36158&T=Module

Dj Task Manager

something a like that is the sort of thing, it certainly looks like the level of simplicity im after.  Any ideas on what circuit is inside the box then?!

Cheers!

Mike

untune

I can't imagine there's much complexity to it.  Try googling for passive mono mixer circuits or even pick one of those up and take it apart! :P

Circuitbenders

i am not paid to listen to this drivel, you are a terminal fool

Gordonjcp

Microphones are at a pretty low level to begin with, so really you do want some sort of active mixer.  It can be a really simple circuit with just a single transistor preamp for each channel, followed by a couple of resistors to combine the outputs.

A diode definitely won't do it, but might give you some horrible crunching distortion that sounds like your speaker coil is rubbing on the magnet.  This might be what you want.
If at first you don't succeed, stick it through a fuzzbox.