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Re: How do you mix 6 channels into 2, without a mixer? [Mapleshade does it]

24.154.39.178

Posted by mg16 on March 10, 2002 at 13:25:32

In Reply to: Re: How do you mix 6 channels into 2, without a mixer? [Mapleshade does it] posted by Roland on March 10, 2002 at 11:00:29:

Hi,
All that a mixer is, is a "summer". It adds whatever signals are fed to its inputs. You can take a high quality op-amp integrated circuit, and set it up with a positive and negative dc supply voltage on its vsupply pins, usually pin 4=- and pin 8 = +. Opearate it at unity gain by tying its output pin, usually pin 7, to its - input pin,(usually pin 5), through a 100k resistor. Connect (6) 100k resistors at one point to the - input pin, and keep the other ends of the resistors seperated as inputs.
If you feed each of your 6 input signals to one of the 6 100k input resistors, the output at pin 7 will be the sum of all 6 inputs.
Op amps used in this configuration, are incorporated into commercial mixers .
If you want to control how much of each of the 6 inputs level are available at the output of the op-amp, replace the 6 100k input resistors with 100k potentiometers, (sliders if you want). You can then adjust the levels of each signal fed to the mix.
Commercial mixers add additional op-amp circuitry configured for fx, eq, panning etc., after the main mix output.
mg16

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