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Tone generator circuit using 555 timer Bird sound generator, Ambulance Siren Generator These are some circuit diagrams of the sound generators. Sounds are like Bird sound, Ambulance siren, Beep Horn, and other different types. Use 9 to 12v Dc supply and components value should be the same as suggested in the diagram because any variation of components value can change the sound type. By some changes of values of some components as given below in the diagram, you can produce many different types of sounds. Use a medium-size speaker, These circuits can be useful for the making of an Alarm, Doorbell or other warning indicators. schematic diagram Bird sound generator circuit http://circuitspedia.com/wp-content/uploads/2020/09/bird-sound-generator-circuit-using-555.png http://circuitspedia.com/wp-content/uploads/2020/09/bird-sound-generator-circuit-diagram-using-555-timer-1.png http://circuitspedia.com/wp-content/uploads/2020/09/bird-sound-generator-circuit-diagram-555-timer.png Alarm sound generator circuit diagram http://circuitspedia.com/wp-content/uploads/2020/09/horn-sound-generator-circuit-using-555-timer.png http://circuitspedia.com/wp-content/uploads/2020/09/siren-sound-generator-circuit.png http://circuitspedia.com/wp-content/uploads/2020/09/beep-sound-circuit-1.png Ambulance sound generator circuit diagram http://circuitspedia.com/wp-content/uploads/2020/09/555-timer-siren-sound-generator-circuit.png Testing Video What is Opto-coupler/opto-Isolator Arduino Remote control AC Dimmer Switch ON Delay Timer circuit High power inverter with charger circuit diagram Infrared proximity sensor circuit Dark sensor circuit - 4 circuit