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10-channel Audio Mixer -Mono (AMX-2A)

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0.06 KGS
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Product Description

"Mini Audio Panel"

The AMX-2A device is a 10-channel audio mixer and  headphone amplifier for aircraft applications. It functions as a mini audio panel for combining various communications, navigation, alarm, warning and other audio sources, amplifies them and provides a seamless interface into common intercom systems—all in a small package that takes no valuable panel space.  System wiring is greatly simplified and the unit occupies a very small footprint, with all of the circuitry contained in a standard 25-pin D-subminiature connector shell.  A large number of signal ground pins are provided to simplify the connections of cable shields.  All of the audio connections are made to the 25-pin connector built into the unit. Four of the ten audio inputs have volume controls that are screwdriver adjustable, while the other six are fixed level for connection to instruments that have their own volume adjustment capability. The output is designed to drive headphone busses directly and has a unique capability of combining the audio from a primary comm transceiver onto the output in a fail-safe fashion.  It is compatible with all intercom systems, including those that do not provide an auxiliary input.

The wide bandwidth and robust output power provide high quality audio. The amplifier stage has a voltage gain of 4 for all inputs.  When connected to a 150 ohm impedance load, this provides a 6 dB power gain, to a maximum of 32 milliwatts RMS over the frequency range of 50 Hz to 15 KHz. The flexibility of the device allows for use as an audio mixer, as a headphone amplifier or as a combination of both as the application requires. 
This product is also available as a kit. See the project page in The Hangar Workshop for the open source documentation.
Technical Summary
  • 10 audio inputs
    • 6 fixed-level with 560 ohm input impedance
    • 4 variable-level with 10 Kohm input impedance
  • Audio output capable of driving 32 mW into 150 ohms (14.2 volt supply)
  • Wide frequency range 50 Hz to 15 KHz (-3dB)
  • Audio output provides fail-safe connection to primary communications transceiver
  • Less than 100 mA current drain, 10 to 30 volt operation.  

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