Multitone Siren


Posted on Feb 7, 2014

This multi-tone siren is useful for burglar alarms, reverse horns, etc. It produces five different audio tones and is much more ear-catching than a single-tone siren. The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio amplifier LM386. IC 4060 is used as the mult-itone generator. A 100 µH inductor is used at the


Multitone Siren
Click here to download the full size of the above Circuit.

input of IC 4060. So it oscillates within the range of about 5MHz RF. IC 4060 itself divides RF signals into AF and ultrasonic ranges. Audio signals of different frequencies are available at pins 1, 2, 3, 13 and 15 of IC 4060 (IC1). These multi-frequency signals are mixed and fed to the audio amplifier built around IC LM386. The output of IC2 is fed to the speaker through capacitor C9. If you want louder sound, use power amplifier TBA810 or TDA1010. Only five outputs of IC1 are used here as the other five outputs (pins 4 through 7 and 14) produce ultrasonic signals, which are not audible. Assemble the circuit on a general-purpose PCB and enclose in a suitable cabinet. Regulated 6V-12V (or a battery) can be used to power the circuit.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Voltage Controlled Panner
    cellphone operated land rover
    Design a esthetic and energy-conserving acousto-optic controlled lighting lamp of corridor
    Magnetic Guns
    Prototyping of White LED Drivers
    LED Light Pen
    DIY Homemade Ignition Coil Driver
    High operating voltage regulator circuit diagram
    Blackout emergency lights 4
    Common emitter amplifier works a



    Top