Thursday, January 22, 2015

DIYcrap audio mixer #2

This is part 2 of "building an audio mixer with effects". For part 1, go here.

The mixer is coming along quite nicely. Thanks to the excellent documentation on the Music From Outer Space web site and the professional quality on the PCBs, I had no problem soldering the four boards together.

The DIYcrap audio mixer
The picture above shows how the mixer looks. The different features of the mixer will be explained as we go. First, lets take a look into the assembly of the mixer.

Testing how the jack plugs and the knobs fit the front panel layout
As explained in part 1, I created the layout in Inkscape. I printed out a test on normal paper, just to check if all the knobs and plugs fitted nicely.

Running the paper through the laminator

After a few minor errors had been sorted out, I printed out the overlay on a piece of orange paper (I wanted the mixer to look a bit vintage and a bit seventees), and laminated it. This is the method proposed by MFOS and is by far the most economical approach to making synth front panels.

The panel is glued to the aluminum Bud-box

After the front panel was sorted out, it was time to fit the PCBs.

The PCBs
The PCBs are mounted on the back-plate of the Bud-box. From left to right in the above picture: Power supply, MFOS auto panner, two MFOS Echo FXXX (on top of each other), and MFOS panning mixer.

MFOS auto panner
Two stacked MFOS Echo modules
The MFOS panning mixer
All the MFOS-components are now mounted in the mixer cabinet and works flawlessly. The stuff that remains are, the SKRM FV1 reverb unit, a highpass filter, and a distortion unit. 

Testing the mixer with a function generator and oscilloscope
Thats it for now. The next part will (probably) cover installment of the the SKRM FV-1 module i purchased from Experimental Noize.