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loolykinns

sound mixer questions

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I saw this article about doin' a sound mixer... but i'm still wondering... why using resisters? i mean is it really important that we use resisters in such thing or its just to reduce the sound coming in because its faster than reducing the sound from these devices...

anyway here's the link... if someone could explain the necessity of the resisters I'll be more than happy

http://gajo.us/docs/cheap-mixer.htm

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Its a shame the article didn't include a circuit diagram, this would make it easier to understand.... see http://www.nirvis.com/mixers.htm

The main reason for a resistors in a passive mixer is to prevent 'shorting' the two outputs from the sources (Xbox and PC in this case) together.

Think of the outputs providing a voltage level (but changing really quickly) at a moment in time one might be +1V whilst the other is -1V connecting these together would be 'bad' ('don't cross the streams' you know!). The resistors provide a resistive load so that the outputs are not overloaded, the output of the mixer will be half way between the 2 inputs.

The resistors will attenuate the signal levels, but that should not be a issue when using amplified PC speakers.

Munge.

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