Home > Circuit Bricks > Buzzer
UPDATED:.20:56 21 October 2013

FUNCTION BLOCK
DESCRIPTION

A buzzer is a device that produces a constant tone or buzzing sound.

Low voltage wire-
ended buzzer

Low voltage PCB
mount buzzer
CIRCUIT DIAGRAM

A buzzer is generally a low power device, around 20-30mA, and can often be driven directly from most outputs.

Some devices may need a transistor driver, a single transistor type should be adequate.

Remember to observe the polarity.

BUZZER DRIVE SUGGESTIONS
Method 1 - directly from an output
Method 2 - with a driver
EITHER
Connect between the output and 0v, this is called sourcing. The buzzer will sound when the "Input" goes high (to +v)

Use an NPN Transistor Driver - remember that the driver sinks current - so connect between +v and the output of the transistor.

OR
Connect between the +v and output, this is called sinking.

The buzzer will sound when the "Input" goes low (to 0v))

Written by Phil Townshend - 2008
www.edutek.ltd.uk - Working Electronics For Students & Teachers