FIRE SIREN USES FLASHER


Posted on Feb 6, 2014

Low-drain circuit operating from 1. 5-V cell uses National LM3909 flasher IC to simulate fire-alarm siren. Pressing button produces rapidly rising wail, with tone coasting down in frequency after button is released. Sound from loudspeaker resembles that of motor-driven siren. Volume is adequate for child`s pedal car. -P. Lefferts, Power-Miser Flashe


FIRE SIREN USES FLASHER
Click here to download the full size of the above Circuit.

r IC Has Many Novel Applications, EDN Magazine, March 20, 1976, p 59-66.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    WinCircuit
    Sound-effects-generator
    DC Motor Control System Block Diagram
    12 volt switching power supply using ltc3810 5
    8-bit Digital to Analog converter (DAC)
    IF AGO network circuit diagram



    Top