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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!

[Circuitbenders]

http://www.aaroncake.net/circuits/mixer2.asp

http://www.circuitstoday.com/3-input-mic-mixer-circuit

theres lots of circuits out there. This page is usually a good start

http://www.epanorama.net/circuits/#audiocir

[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.