Rude Awakening: Low-Frequency Sounders
For years, there has been concern about the waking ability of fire alarm audible notification appliances. In general, they have gone through numerous changes since the 1980s. Back then, it was common to use bells to signal an alarm. As technology changed, it was found that the bells emitted too much electrical noise back into the system and it caused problems with transistors and integrated circuits.
from EC Mag - Power and Integrated Building Systems Magazine http://www.ecmag.com/section/systems/rude-awakening-low-frequency-sounders
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