Electronic Siren Circuit


Posted on Feb 6, 2014

The DIY Electronic Siren circuit described here can create three different US-style siren sounds: DIY police, DIY ambulance and fire engine. The desired sound can be selected using switch S1. The circuit can be used in toys (such as model vehicles), as part of an alarm system, and in many other applications. For use in a toy, a BC337 is an adequat


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

e device for driver T5, since it is capable of directly driving a 200mW (8 ©) loudspeaker. In this case the current consumption from a 9 V power supply is around 140 mA. If a louder sound is required, a BD136 is recommended: this can drive a 5W (8 ©) loudspeaker. The current consumption of the electronic siren from a 12 V supply will then be about 180mA. If still more volume is desired, then T5 (a BD136) can be used as a first driver stage, and a 15W (8 ©) loudspeaker can be connected via output transistor T6. Here an AD162 or an MJ2955 can be used, which, for continuous operation, must be provided with cooling. The peak current consumption of the circuit will now be about 500mA with a 12V power supply. Capacitor C1 is not required for battery operation.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Remote Controlled Digital Clock with AT89C2051
    Remote IR controller
    Telephone-handset-encoder
    Radio Commercial Zapper Circuit
    beat frequency oscillator simple metal
    Astable Multivibrator using NE 555 timer IC
    app note high voltage led applications
    modifying fm transmitter circuit 3
    TDA2030 200 watt amp low cost audio power amplifier
    Mini stroboscope
    Pull transistor relay delay circuit diagrams



    Top