Experimental Airplane Solutions

Audio Alert System


An Audio & Vocal Alert System to send alerts or notifications to headsets/intercom.

Custom configuration and trigger rules using airspeed and activate time.


In stock

SKU: EBAAC_V1 Category:
  • Description


A powerful and unique controller with vocal alerts heard over the headset/intercom.  

  • Select your own unique audio alerts and your own rules.
  • Customize this system to suit your airplane and equipments exactly.    
  • This Audio Alert System includes a Pitot-Static differential pressure sensor that is temperature compensated and calibrated.  It also includes 4 trigger inputs, each trigger input comes with its own stopwatch.
  • Each trigger can utilize the airspeed and/or stopwatch for the alert operation.  
  • Each trigger can also utilize the status of another trigger. See examples below for a small portion of various possibilities and combinations.  
  • No two units will be identical, each unit will be unique to each design/airplane or system.  
  • The system is pre-configured for each scenario requested.
  • You can even send your own Audio/Voice files to be used in any language or we can use a computer-generated voice in several languages and even various accents.  

The 4 trigger inputs are divided into two (2) 12V-triggers and two (2) Switch-to-ground triggers.    

The 12V trigger means that this input is triggered (activated) when it senses 12V in the connected wire.  

The Switch-to-ground trigger pins get activated when the connected wire is grounded.  

These switch-to-ground triggers are compatible with any glass panel or system that offer Open-Collector outputs for alarms or signals.  The Open-Collector output sinks or connects the signal to ground to indicate a status and these can be connected directly to this system.  

Connecting Limit switches, Plunger switches, Hall-Effect switches are also straightforward as normally these type of switches are also switch-to-ground.  

These Switch-to-ground triggers can also be converted to be 12V triggers.  

Any device that is normally-open or normally-close contacts can be connected to this system to trigger an audio alert over the headset.  Devices such as normally-open temperature sensors, pressure sensors, and CO sensors are an ideal add-on to the Audio Alert System.  

The system can also alert if a certain trigger pin did not get activated for a set time or speed.  Any airplane can utilize the vocal alert controller to customize specific alerts depending on various input/scenarios.   


Example of a unique unit:

A pilot with a retractable landing gear decides for Trigger-1 to be Teed into the Gear Up switch and whenever airspeed reaches 90 kt with Trigger-1 pin still have 12V (meaning the Gear Switch still on UP position), a vocal “Check Landing Gear” will be sent to the intercom/headset every two seconds until either the Gear Switch changed to down or speed is increased.  

The pilot also selects Trigger-2 to be connected to the Gear Pump power, when the pump starts running, Trigger-2 senses 12V and starts a stopwatch.  An Audio alert is sent to the headset if the set time passed and 12V still sensed on that pin.  

Trigger-3 is selected to be connected to the Automatic Fuel-pump transfer system between the tanks.  If the fuel pump had to run for more than a set time, for example, 4 min, an Audio Alert is sent.  

Trigger-4 is connected to a Limit switch or a magnetic switch which is connected to the canopy.  When the canopy closes, the limit switch/magnetic switch is closed, grounding the pin connected to the system.  The rule for this trigger is to alert if the switch is not closed and speed is more than 20 kt for example. Below 20kt, regardless of the status of the switch, no alerts are sent.  


Another pilot with a similar airplane may choose different Audio Alert rules and sequence altogether.  

The design still uses Trigger-1 for Vocal alerts for the gear up below a certain speed, and also uses Trigger-2 for pump duration but selects different vocal alerts and different speed and duration for the pump.  Trigger 3 is used for Canopy, and Trigger 4 is selected to monitor carbon monoxide (CO) sensor output and issue an Audio alert if activated.


A third pilot with a fixed landing gear and no gear pump can design the system completely different such as

Trigger-1 is used for Canopy/Doors.

Trigger-2 for Flaps.

Trigger-3 for CO sensor.

Trigger-4 is connected to a switch in the panel and the rule is to send a specific vocal alert every 20 min for example whenever the panel switch is active.  



Note that Video shown uses a 6-Trigger pins of this unit which was the first edition.  Currently 4-Trigger units are being offered which made the unit smaller and costs less.  V2 controller is identical to the video except it has 4 Triggers instead of 6.