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5-channel Stereo Audio Mixer (AMX-4A/4B)

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0.05 KGS
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Product Description

The AMX-4A/4B device is a 5 channel stereo audio mixer for aircraft applications. It is similar to the AMX-2A mono mixer, except for the provision of stereo left and right outputs.  Connecting the two outputs together allows the device to be used in monophonic applications. Two of the five stereo audio inputs have volume controls that are screwdriver adjustable, while the other three are fixed level for connection to instruments that have their own volume adjustment capability.  The AMX-4A is capable of driving up to 3  volts peak-to-peak with a nominal gain of 3 dB (unloaded), while the AMX-4B is capable of driving up to 12 volts peak-to-peak with a nominal gain of 15 dB (unloaded).

This product is also available as a kit.  See the project page in The Hangar Workshop for the open source documentation.

Technical Summary
  • 5 stereo audio input channels
    • 3 fixed-level with 560 ohm input impedance
    • 2 variable-level with 560 ohm input impedance
  • Audio output capable of driving low-level entertainment audio inputs directly without overload (AMX-4A)
  • Audio output capable of driving 12 volts peak-to-peak, including headphones directly (AMX-4B)
  • Wide frequency range 30 Hz to 20 KHz (-3dB)
  • Output impedance of 150 ohms, each channel
  • Less than 50 mA current drain, 10 to 30 volt operation

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