looking for a matrix audio mixer circuit, with ~ 3 channels

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zsolt1

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hi ,
can somebody suggest a ~3 channel audio matrix mixer circuit ?
Some circuits which where already 'tried out' would be great .

Thanks,
zsolt
 

zsolt1 said:
hi ,
can somebody suggest a ~3 channel audio matrix mixer circuit ?
Some circuits which where already 'tried out' would be great .

Thanks,
zsolt
Click to expand...

One of the circuits here has level controls. More importantly, there is very good explanation of the circuits:

http://www.all-electric.com/schematic/simp_mix.htm

I have used the information here to successfully design and build my own circuits.

John
 

An op amp adder circuit comes to mind. make an op amp input for each channel with a control in the feedback on each for gain and then all connect to another op amp with its output as input to a preamp.
depending on the voltage available the resistors or slide pots need to be adjusted accordingly. For most preamps a 1V peak to peak voltage is considered maximum. So .5V is nominal.

a rough pic is here https://obrazki.elektroda.pl/2397098900_1373588577.jpg
 

zsolt
have a look at the Elliot Sound website: **broken link removed**
There are various proven circuit designs which can be configured as you need as an Audio Mixer in the 'Projects' section.

Various others if you do a search on't 'net

For a 'Matrix' configuration, say 3 inputs to 3 outputs, look at creating a form of crosspoint for each input to be able to be either faded individually to each output or alternatively switched (routed).
If you want to have some form of 'preset' IO setup, look into using VCA's.

Perhaps when you have a better idea of what you want to do, come back to this thread with a block diagram and parts of your mixer which you might be unsure of could be discussed further

hope this assists
Mik
 
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