Creating a DIY mixer with levels, panning and EQ to Master out

Hey,

Haven’t been around for a while, happy to be back, was curious to try a new build, but I couldn’t find a thread where this was fully discussed, like a mixer with multiple inputs and levels, panning, LP/HP knobs per channel. I mean There is the thread and tutorial on the main website on how to build a mixer but I wouldn’t know how to integrate the rest into that. Like a 4-8 channel with level knob + LED indicator, panning knob, eq knob (left=low, right=high) and then a Master knob controlling the Left + right output level.

Super curious to hear your thoughts on how to make this in either an analog or digital (arduino) way.

Best!

A/

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I think this is a case where analog is so much easier than Arduino which would require some kind of analog multiplexing to get multiple potentiometers per channel and ADC per audio input, and sound quality would be worse than with pure analog system.

Adding panning knob to a simple mixer is easy, just use dual-potentiometer as volume control and feed signal to opposite pins in the potentiometers in it.

There are lots of different EQ-designs, simple 6 dB/oct low and high pass filters are easiest to make (literally one pot and one capacitor) and could just be added to signal path, preferably with some buffering. Fully parametric band pass EQs get much more complicated.

I just designed myself a 3 mono channel and one stereo channel mixer with panning on the mono channels and switch to have the stereo input as line or modular level. Output also has switch for line and modular level and of course master volume pot. Yesterday I ordered pcb:s for that, I’ll post the schematic when I’ve received, built and tested it. So probably not very soon, as how often first prototype works as intended and doesn’t have some stupid mistakes?

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my partner in crime has been really interested in a cv-controlled panning mixer. she loves playing with stereo.

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almost never but it always feels like magic when it happens

I think a great example of a somewhat more complex mixer is the Befaco Hexmix, for which the schematic can be seen here.
There is also the Hexpander which adds aux sends and other stuff :slight_smile:

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Here’s an example of a cv-controlled panner: Voltage-controlled panner/crossfader

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Yeah, I saw a filter project here with just a capacitor to the knob and tried it it worked as a lowpass, I guess I could kind of mix up different tutorials. I will give the panning a go with the dual pot.

For the EQ design, I think I better inspire myself either from capacitors or maybe push it and use a filter design.

Yeah, I would be curious to see how you have built it, I am a real beginner when it comes to schematics but it’s never too later to dive in I guess.

Thanks for the input!

Yeah, that was kind of the inspiration behind the project, and my current big studio mixer, I basically just wanted one in modular form.

But it’s so cool I didn’t know they shared the schematics, even though I don’t know how to read them properly at least I can have a look at how it’s built, thanks for the share!

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There is a very good writeup on eq here: Equalisers
And yeah, it really helps to be able to read schematics, just start with simple ones and go on from there, it’s not that hard once you get the basics :slight_smile:

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it seems like one of those things that just isn’t worth diy , by the time you design get parts and build and deal with the diy wonkyness [ not that your building skills are sub par ] but yeah there are dozens of commercially available mixers . everything from pcb’s to fully built units.
I have built Ray Wilson’s MFOS mixers from the pcb’s available at Synthcube and they work fine just really simple like no cv and I also own the Befaco Hexmix with the hexpander as mentioned above while they cost a bit the features are many .

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the YT algorithm just offered me this

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But why buy something ready-made when you can spend double the price to build it yourself?

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LOL , you are a masochist .

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I think it’s a cool project just for learning, but yeah if the cost of all pieces come up to the price of a module I might start with a passive build.

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