|GCSE Transducer Battery Bulb >Buzzer< Driver Loudspeaker Microphone Motor Neon Piezoelectric Sounder Servo Seven Segment Solenoid|
Input: A DC Voltage
Output: Sound waves - a buzzing noise.
The DC buzzer often uses a piezoelectric disc to generate the sound.
It also contains an oscillator circuit the generate the AC signal needed to drive the piezoelectric disc.
Its main advantage is simplicity of use.
Its main disadvantage is lack of choice ofer the pitch of the buzz.
These do not generate their own sound. A separate circuit like an Astable is needed. An audio power amplifier might be needed.
Buzzers convert a Direct Current into a buzzing noise. This can be anything from an unobtrusive warning sound to a deafening noise designed to be heard in very noisy environments.
Some are semi-mechanical. Others use an oscillator circuit to produce an AC signal. This is used to drive a transducer that converts the AC signals into sound energy.
In all cases the sound is produced by a vibrating surface that creates pressure waves in the air (sound).
The vibrating surface can be made of quartz, using the piezoelectric effect or a moving coil can vibrate a paper cone (a loudspeaker).
A bell is a special case. There is a vibrating clapper which strikes the bell.
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