Simple Siren


Posted on Feb 5, 2014

THE circuit shown provides a smooth, piercing, wailing siren with a minimum of components. Not only this, but three spare gates of hex inverter IC1 remain, which means that a true cacophony could be created by running two sirens off the same i. c. Gate IC1a is configured as a slow oscillator which repeatedly charges and discharges capacito


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

r C1. The charge on C1 is used to control the conductance of power MOSFET TR1, which in turn modifies the frequency of the audio oscillator formed around IC1b. IC1c serves as a buffer. The period of the siren is determined by C1 and resistor R1, and its frequency by C2 and R2. Ideally, C2 and R2 will be selected to find the resonant frequency of the piezo sounder for maximum volume. If a piezo tweeter is used, the Simple Siren will produce an impressive volume. An inductive sounder (e. g. a speaker) may be used if a capacitor (e. g. 100F) is wired in series with it.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Electronic-music
    SimpleThermometer
    ATmega16 Programmer
    1000 watt power inverter circuit diagram
    Momentary Switch Teamed With Latching Relay
    pmw driver circuit class d amp
    just sanity check transformers
    HQ Notch Filter Without Close-Tolerance components
    High Resolution 24-bit Data Acquisition System instrument-control
    Switching Regulator Circuit
    Voice music outlet circuit diagram SK- made



    Top