The AMX-2A, AMX-4A and AMX-4B are high-performance
audio mixers. They all share the same base circuit board, as
indicated by the similarity of their schematics. The original
physical designs were crafted to fit into slightly modified standard
DB-25 connector backshells. The resulting products weighed
only a few grams and occupied very little space.
Similarly, the ASX-2A and ASX-2B share a base circuit board design. These designs provide the capability of adding high-fidelity music into a standard aircraft intercom system. They support auto-mute, which is the capability of automatically muting music audio when communications audio is active. The ASX-2B provides an additional interface to allow voice communication on standard cell phones or music phones (combined cell phone and music player).
Although designed for aircraft use, these circuits are universal in their applications, working from a power supply of up to 30 volts, and driving loads as small as 32 ohms impedance. The wide bandwidth of approximately 40 Hz to 15 KHz (-1dB) makes these devices idea for high fidelity applications.
The AL-1A is an alarm tone annunciator that can be used to generate tones in an aircraft audio system when a switch closure (high or low) is sensed.
AMX-2A 10-channel audio mixer
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.
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.
AMX-2A, packaged in a D-SUB 25 connector shell.
|AMX-4A/4B 5-channel audio mixer
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).
AMX-4A or AMX-4B, packaged in a D-SUB 25 connector shell.
|ASX-2A/2B stereo music adapter
(with optional cell phone interface)
ASX-2A and ASX-2B, packaged in a D-SUB 25 connector shell.
|AL-1A Alarm Tone Annunciator
The AL-1A device is a tone
annunciator for aircraft applications such as
stall or oil pressure warning systems. It senses
either high-level or low level inputs from switches
or sensors and generates a pulsed (beeped) tone in
the aircraft audio system.