Overkill guitar circuit

[ELS122]

so I went on a goal to make a circuit capable of having every combination possible with 2 humbucker pickups, it's really complicated (to me at least), I think it's genius how it does the switching cause I thought it up on my free time  and I don't even know how I'm gonna fit it in my guitar.
it's based on a Teensy 4.0, and you can just look at the schematic:
https://easyeda.com/EdLS/guitar-circuit

and yes I had to put my name all over it, otherwise, I have nightmares about someone stealing my circuits and getting all the credit for it.

I know why you wouldn't have all this circuit in a guitar, but I want to experiment with it.
what are your thoughts? maybe I should change something? also, I intend to have an external box that has a linear power supply for the power supply rails.

[Cyberdragon]

I have nightmares about guitars that need a whole 5-pin XLR to connect it...

[obiwanjacobi]

I would first try a prototype setup where you test if the GS4157-CR switch you intent to use actually works with the high impedance passive pickups.
I did not know these and not sure if the 2.8 ohm will cause an issue (probably not - unless there are a lot in series).

Music Man brought out a model they called 'Game Changer' that had a similar concept. Completely programmable.

I did give this subject some thought myself:
You could also think of throwing in some digital pots to color the sound (tone) and set the amplitude (volume) for each pickup.
Have presets in your guitar for several favorite settings which can be easily selected by a multi-position switch (more than 3 settings would be my choice)
Support MIDI-in to get your guitar to switch guitar 'presets' when you change presets on your effects unit.

Would love to hear how this goes.
[2c]

[ELS122]

the 2.8ohm impeadance wont matter at all. pretty much anything below ~5k usually wont matter, except if you plug it into an amp with a low value resistor on the input, then it would, but in this circuit wont.
the digital pot I want it to adjust the volume so when you switch it between settings you don't have a volume change.

my biggest problem now pretty much is the current draw of the analog switches, they each draw about 80mA, and with like 20 of them it draws A LOT of current.
maybe there's something that can also switch a signal like them but without a massive current draw?
then I could make it not use a din 5 connector and instead a 9v battery perhaps, even if not it would be better that it doesn't draw that much current.
also I could use a stereo connector also to supply power BUT, then I would need to step down the voltage to 5V for the logic circuits and still have 12V for the op amps.
and that would mean 2 things, noise and heat.

oh also my plan was from the start to have presets and have them selectable by the rotary encoder, and also having the ability to set "favorite" presets with it too.

[OwO]

I've never heard of analog switches that draw 80mA; it is probably the maximum rated thru current and not quiescent current.

[obiwanjacobi]

I see an idle current of 1uA but nothing else to be concerned about (quick scan)
https://datasheet.lcsc.com/szlcsc/1912111437_Gainsil-GS4157-CR_C280709.pdf

Making a simple prototype can also shed light on that subject...?

[ELS122]

ABSOLUTE MAXIMUM RATINGS
Supply Voltage VCC.........................................–0.5V to +7V DC
Switch Voltage (VS)(2)...................–0.5V to VCC +0.5V
DC Input Voltage (VIN)(2)...........................–0.5V to +7.0V
DC VCC or Ground Current (ICC/IGND)..................±100mA 
DC Output Current (VOUT) .......................................128mA
Storage Temperature Range (TSTG) ....... –65°C to +150°C
Junction Temperature under Bias (TJ) ...................... 150°C
Junction Lead Temperature (TL)  (Soldering, 10 seconds) .................................... 260°C
Power Dissipation (PD) @ +85°C .............................180mW

is that current draw or am I stupid?

[obiwanjacobi]

I interpreted that as max current to sink or source...?
More a load thingy..?

[ELS122]

Well the ”VCC or ground” part makes me think it's power line current draw. Idk, gonna think this over more tomorrow!

[ELS122]

but isn't 100ma a shit ton of current? it would mean that it like dissipated half a watt of heat. and I don't know much about surface mount packadges but that seems a whole lot for that smol ic.