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This project contains all design files for a **6:1 audio multiplexer** , meaning it can switch six analog inputs into one analog output.
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It is based on the [BD3491 ](https://www.digikey.de/product-detail/de/rohm-semiconductor/BD3491FS-E2/BD3491FS-E2TR-ND/5720882 ) which does everthing related to the Audio signals.
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On top of switching the inputs, it is also able to condition the signal. It can
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- Apply Bass-Boosting and Treble-Boosting (essentially a crappy 3-Point Equalizer)
- Amplify the input signal by up to 20dB
- Add attenuation to the individual channels (aka. balance the left and right channel)
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All of these feature of the chip can be activated with the on-board STM32, which can in turn be controlled
with either on-board buttons or via it's integrated USB port. One can either use the serial protocol directly
or a [GUI written in python ](gui/README.md )
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The Board can be supplied over said USB port as well (if the primary use-case implies it beeing connected
to the PC constantly) or by applying power using a 2.1mm Barrel Jack.
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For more details on the pcb, check the [PCB readme ](kicad/README.md )
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For details on the Serial command syntax and firmware flashing instructions, check the [firmware readme ](firmware/README.md )
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# Why
Because ?
Sometimes you just need more inputs. This is how you do it.
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