Mini mixer for guitar

[Skinslapper]

Hi everyone,

I'm a bit of a noob who has wired a few guitars. I'm planning to build a mixer for my pedal board that will allow me blend numerous sources from my effects to two amps and swap the right channel for a second guitar as my singer plays on some songs. The basic layout is below. I'd like some advice on what values/brands I should get for the pots, and what other components I should be adding to this design to keep the noise down and the signal strong.

Thanks.

[niektb]

I don't entirely get it, why is the blue line connected to the right side of R1?
Also, you wíll get a big volume drop when you have the pots in de middle, did you realize that?
I'm unsure about the polarity of your caps, if a device you connect has DC on the output then your caps will be reverse biased and might blow.
Finally, what kind of devices are connected to the inputs? Is it already line level or still guitar level? Does the vocalist mic (is that what M9 stands for btw?) need a preamp?

[Skinslapper]

My apologies, I was using a different schem app and was working with what I had.

The M9 is the wet signal from my EHX M9 pedal (it emulates a melotron).

I'm hoping a 1MEG pots (or other) might help keep the signal clean(er).

All of the inputs are taking an instrument level signal.

I've used DIY Layout creator and made a new diagram. Hope that makes more sense.

[niektb]

Aah they're jack connectors, i thought they were DC-blocking caps lol

But like I asked you, is a volume drop in the middle of the pot a big problem?

[Skinslapper]

What would you suggest as a better option?

[Scruffie]

Unless you want lots of signal bleed, loss and headaches, you'll be wanting these links.

http://www.geofex.com/Article_Folders/panner.pdf

[Skinslapper]

Thanks, that article had a lot of good info. I especially took note when it said that last circuit would still have trouble panning between amps. Perhaps I should replace the pots with rotary switches for just wet, wet/dry, dry options.

[bartimaeus]

Seems like it'd be best to just build active mixers with mute switches on the inputs. That gives you the most flexibility and the best signal integrity. Rotary switches seem appealing for the simplicity, but you're probably better off with a toggle per input/channel.

[quad4]

Here's the schematic that the Rolls MX28 Stereo MINI-MIX VI uses.   There is some variation from this schematic (e.g., they use all 4560's in place of 4556's)

[Skinslapper]

Thanks for the input everyone. Ultimately, this has taught me I'm in over my head and should try to stick with off the shelf options.

I think I'll grab an Alctron ABY with parallel outputs for my Right blend, a Loopi ABY for the left blend and a Loopi AB to switch between Guitar 1 Right and Guitar 2. No doubt, this will have some adverse effect on my tone, but I can easily add buffers or change out the components as I go. Yes it will be a bit messier than I was hoping, but maybe one day I'll open these up, learn how they work, integrate the components into one housing, etc.

https://www.swamp.net.au/swamp-SW-21-guitar-a-b-amp-switch-y-splitter-signal-router?awcp=223364331&awgp=15781060611&awkw=&awct=48330344811&awpl=&gclid=EAIaIQobChMIpvju7o2K6gIVUX8rCh27XAuVEAQYASABEgK-DfD_BwE

https://www.loopipedals.com.au/product/active-aby-pedal/

https://www.loopipedals.com.au/product/mini-ab-pedal/

[ElectricDruid]

It'd be cheaper to buy a small stereo mixer than all that lot put together. You've got a $170 budget right there.

You could mix the signals, and pan them to the two outputs. When your singer plays guitar, you mix their guitar channel up panned hard right, and flip everything else hard left.

Here, have a look at this lot:

https://www.thomann.de/intl/analogue_mixing_desks.html?oa=pra