First Project: Digital Audio Patchbay

Community General Discussion
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Hi all,

I'm new to Arduino and thrilled to join this community. I can create simple Arduino projects from tutorials and have a basic understanding of electronic schematics.

Now, I'm diving into a larger project—a digitally controlled patchbay—and seeking guidance on necessary parts/modules. I'm currently exploring multiplexers and their relevance to my project.

For those unfamiliar, a patchbay simplifies connecting various music studio devices to a mixer. It eliminates the hassle of rewiring for each session with different instruments.

I aim to create a digitally controlled patchbay, prioritizing switches over AD/DA conversion. I've identified the CD74HC4067 with a 16:1 configuration, offering 16 inputs and 1 output.

Now, I'm seeking advice: With 48 audio inputs (Drum Machines, Synthesizers and so on) and 16 mixer inputs, would using 16 multiplexers effectively handle the 16 inputs? Sounds like a lot of plexing :smiley:

I appreciate any insights or alternative part suggestions for my project.

Thanks for your help!

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A 48x16 crosspoint switch.

A 48x16 matrix will allow you to connect any input to any output.
One extra column of 48 relays will connect 48 inputs to the switch.
One extra row of 16 relays will connect the matrix to the output channel.
Total relays = 48x16 + 48 + 16 = 832.

Here is an industrial example of 16x16 crosspoint switch, along with the "language" to make the connections:

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Thx xfpd! I've identified the issue now – there are just too many inputs and outputs. I plan to streamline the inputs and will experiment with two 16:16 using the AD75019 or something smaller. Alternatively, I might consider building something in combination. I'll do my best to figure it out. Your assistance is truly appreciated!

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