Gain knob barrier for UMC1820
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prevents accidental change of input gains
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I have made a microphone array for measuring polar patterns and whatnot, and it is important that the gains of all the mics are matched. Tuning them is an elaborate procedure, yet it is so easy to bump a knob off of the tuned position, and not even notice.
This barrier essentially prevents one from adjusting the gains.
To install, first, pull off all the handles. Then you'll need to drill holes for screws. For M3 screws, use 2.5mm drill. Use the shield as a stencil to drill the holes. It may be a good idea to dremel slots on the shafts of the pots to adjust the pots with a screwdriver without taking the barrier off.
Attached FreeCAD file contains the parametric model for the barrier. You'll need to install Lattice2 addon to use it. The default state is a barrier for all 8 channels; you can reduce the number of channels covered by modifying LinearArray's Count property.