Outputs

Output devices allow a system to present information back into the ‘real’ world. Examples can be seen everywhere, from car indicators to doorbell buzzers or information displays.

Purpose of output devices

curriculum-key-fact
Output devices take the signal from the process device of a system and turn it back into a physical or ‘real-world’ signal, such as light or sound.

Light outputs

Light can be created using lamps:

The standard electrical symbol for a lamp alongside a photographs of a small indicator light bulb and an incandescent light bulb.Lamp - Used on control panels as an indicator or to provide illumination

Sound outputs

Sound can be produced using buzzers or speakers.

Buzzers

  • buzzers have an oscillator inside a plastic case
  • when current flows through them they produce a buzzing sound, often around 400 Hertz (Hz) in frequency depending on the type of buzzer used
  • examples of their use include in doorbells and alarms

Speakers

The standard electrical symbol for a buzzer alongside a photograph of a buzzer component and connection wires.

Buzzer - Used to generate a warning sound

Question

Name a suitable output device for an MP3 amplifier system.

Speaker.

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