- Published: Monday, 20 June 2016
- Written by Jon Chandler
My FAA Wake Turbulence Timers have been installed at 10 test sites for a year. The evaluations from the Air Traffic Controllers who have used them are favorable, but one requested feature was a volume control for the piezo beeper used to signal the end of the countdown period. In some towers, the beeper was just the right volume, but in quiet towers, it was way too loud. This didn't seem like a difficult problem to solve.
The beeper used was actually a magnetic beeper - it's an active beeper, requiring only the application of 5VDC to sound. An active piezo beeper could just as easily be used, so I started with a search for controllable-volume piezo beepers. There are indeed piezo beepers with a volume control - a mechanical shutter to control the size of opening of the sound exit. Beepers of this type are huge and not suited to my application where the maximum beeper diameter is about 16mm.Discuss this article in the forums (15 replies).