This circuit uses a 555 timer IC and produces a fixed frequency audible tone that is played through a loudspeaker. No amplifier is necessary as the 555 puts out a signal of high enough amplitude. The circuit is easy to build for beginners in electronics and can be built on an electronic breadboard. Click the above link to find the circuit diagram.
This two transistor metronome circuit can easily be built on an electronic breadboard. The circuit is easy enough for beginners in electronics consisting of only six components, a loudspeaker and a nine volt battery or 9V power supply.
Find the circuit diagram for the metronome at the above link.
This article shows how to solder wires to a small loudspeaker so that it can be easily plugged into an electronic breadboard and used in various breadboard projects.
In this tutorial you will build a wailing siren that plays a tone that increases and decreases in pitch. The circuit is built from two 555 timer ICs and some additional electronic components. The wailing tone is played on a loudspeaker.
A Wailing Siren Circuit that uses Two 555 Timer ICs
A light activated alarm is built in this tutorial. When enough light falls on the LDR in this circuit, an alarm tone is played on the loudspeaker.
Light Activated Alarm Circuit Diagram