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

    Detection systems in PET
    Power Amplifier 6
    TIPE Project
    pcb How to use the same switch to control LED and vary resistance
    220 Volt Disco Lamp circuit
    maximum minimum voltage indicator
    converter r2elhc600a 10v
    Speed-Limit Alert
    49MHz Toy RF Transmitter
    TTL Load circuit
    jk electrical lighting sound systems
    100 V output with shunt regulationl



    Top