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Boeing 757 Audio Panel

The Introduction    I have had this Boeing 757 audio panel, Boeing 285T0022‑42, since 1991 and it has been sitting on a shelf, collecting dust. It has a seven position push button to switch the active mic, also a way to select the boom or oxygen mask.  It has fifteen on-off/volume switches. For ADF it has a selector for Voice/Range/Both. It has two connectors one can go to another unit and the other one can go to the controller. It also has to hold one isolation amplifier per channel.

The Analysis   

The Plan

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