PCB to build summing mixer 2x10 balanced inputs, DIY project
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This is the listing for PCB to build passive summing mixer in 2U rack.
I have made one using this PCB and fine 1% tolerance metal film resistors (see photos).
For the XLR connectors you can opt for NC3FD-V and NC3MD-V (cutting copper pin as shown on photos) or any other you would prefer to fit your design and PCB (wire soldering is also an option if, for example, you want to solder TRS connectors, but keep wires short and screened).
The mixer has 10 balanced inputs per channel, two channels.
The mixer has two outputs per channel - one passive, right after the summing network and another is for connecting output to the make-up stage, if such is implemented inside the mixer (so you can connect the output from the summing network to the make-up stage internally, and them after make-up stage to the second output, see schematic attached).
Thus, summing 10 stereo busses, balanced I/O.
One summing PCB supplied only, other images are for the reference.
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