Simple Police Siren US-Style


Posted on Feb 5, 2014

The circuit described here can create three different US-style` siren sounds: police, 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 adequate device for driver T5, sinc


Simple Police Siren US-Style
Click here to download the full size of the above Circuit.

e 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 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

    Modular Burglar Alarm
    3V Power Supply For Portable Radios
    Automatic light activated switch circuit
    Charging the Earth
    Buck Boost Voltage Converter
    3D Printed Netduino Remote Controlled Car
    controlling your trains with an arduino
    tv transmitter and pal video modulation
    U-110 1.5 Mhz Current Mode Ic Controlled 50-watt Power Supply
    ISL83490 3.3V Full Duplex 10Mbps RS-485/RS-422 Transceiver
    Ridiculously Simple AVR AM Radio Transmitter
    Slave Flash Trigger
    AM circuit by MC1496



    Top