Networked Audiomixer

Networked Audiomixer
Participants	User:buzz
Skills	Electronics
Status	Planning
Niche	Electronics
Purpose	Infra
Tool	No
Location
Cost
Tool category

Networked Audiomixer

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What

We've had experience with hardware like this through the Nexia_PM, but thats a very expensive device.

This project aims to make a simple 4x in 1x out (or maybe 2x out) stereo mixer that is controllable over network -only-.

• 

How

Dreamer suggested this circuit ; https://www.cgs.synth.net/modules/cgs33_matrix_mixer_euro.html *archive*

This shows a mono 4 to 1 summing mixer, which would be adequate. As i have 12 digipots in home, not 16, i'll adjust it to 3 to 1.

My idea is to end up with 2x the input (buffer) circuit, and 4x the output (mixing) circuit, so i end up with a 3x2 matrix mixer.

After this version works, i want to remix it to a cheaper version, using FM62429 as digipots perhaps, and have the dual voltage regulator on the pcb?

Components

• 2x Input boards 'row board'
• 4x Output boards 'column board'
• Power Supply
• Input and output connectors
• SBC part to operate the digipots, and receive the second stereo output

Stuff to get

Input boards

This gets 3x mono inputs.

Resistors

• 3x 100k
• 3x 1k

Capacitors

• 2x 10uF 25V
• 2x 100nF

Opamps

• 3x TL071 , or 1x TL074

Huh

• 2x Ferrite beads

Output boards

This gets 3x mono outputs.

Resistors

• 6x 100k
• 1x 220R

Capacitors

• 2x 47pF
• 2x 100nF

Opamps

• 2x TL071 , or 1x TL072 (or as i need 4x these output boards, 1x TL074 and share half to second output board)

Others =

• connectors , ???
• some powersupply? (this circuit needs -15, 0 and +15V) , maybe this meanwell

• some kinda case?
• some SBC with line-in and network (and storage?) :)