Starting Electronics Needs Your Help!
It is that time of the year when we need to pay for web hosting and buy new components and equipment for new tutorials. You can help by making a donation. Contribute to this website by clicking the Donate button. The total will be updated once daily. (You may need to clear your browser cache to see the updates.)
Target Amount: $2000
Amount Raised: $1016
Top Donor: C.C. $100
Created on: 15 May 2013
This circuit can easily be built on an electronic breadboard and uses a 555 timer IC to produce an audible tone of about 750Hz on a loudspeaker.
The circuit can be used as a warning siren or in place of a buzzer.
Although the circuit diagram shows the circuit operating from 9V, it should operate from about 5V to about 12V.
An 8 ohm loudspeaker driven by the 555 IC produces the audible square-wave tone.
This video shows the circuit operating and the frequency produced by the 555 being measured.
Can't see the video? View on YouTube →