Custom Speaker and Buzzer FAQ’s

The following are some of the Frequently Asked Questions that our customers ask us:

  • How Can I Adjust The Volume Level of An Alarm?
    (1) Change the voltage going to the alarm, or
    (2) Use an accessory to baffle down the volume.
  • How is Sound Level Measured?
    It is measured in decibels (abbreviated dB). It ranges from 0 dB to 130 db. 0dB represents the point at which the sound can be heard.  130db represents the point at which pain is generally felt in the human ear.  An increase of 10 dB will double the loudness of a sound.
  • How Sensitive Is the Human Ear to Changes in dB?
    Most people cannot distinguish a difference of 3 decibels.
  • How Does a Piezoelectric Transducer Alarm Work?
    This type of alarm consists of a metal disc that has a ceramic material bonded to it.  When voltage is applied to the ceramic, it caused the metal disc to physically flex and produce audible sound.
  • How Does a Electro-Magnetic Alarm Work?
    This type of alarm consists of an electro-magnet and a nearby bare metal disc. When voltage is applied to the electro-magnet,  the metal disc is flexed and audible sound is produced.
  • What is the Difference Between a Transducer and an Indicator?
    Transducers are more complex in nature and give the designer wider ranges in frequencies that can be selected.  An external driving circuit is required, so the cost of transducers are typically higher than that of an indicator.
    An indicator has its own built-in driving circuit and is simpler in design, but it limited to a fixed single frequency.  As a result, it it typically lower in cost.