Speaker

The speaker module turns electrical current into sounds! This module is a bit special because it requires to be connected to a module that produce electrical “tones” rather than flat current. Typically, you’ll use a controller to do that.

Some tiny speakers can be powered directly from a micro-controller, however other ones need to have an amplifier. For simple square tones, a single transistor or MOSFET can be used.

Make

• Trim out the two cables coming out of the speaker
• Connect them to binder clip
• Secure everything with glue and add green tape to mark the module

Circuits

In this circuit, the speaker is attached to the MOSFET 0 of the micro:bit relay module. The code on the micro:bit generates square tones on pin 0 which open and close the current flowing via the MOSFET.

Gallery