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Siren Circuits
Last Updated on:
Thursday, October 30, 2014 09:22 AM


Circuits Designed by Dave Johnson, P.E. :
  • 3V Sweeping Siren Alarm
    The circuit uses a LTC1799 precision frequency generator from Linear Technology.  A 74HC14 hex Schmitt trigger from Texas Instruments is also used to perform several other functions.  One section is wired as a simple 7Hz square wave oscillator.…

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
3V Sweeping Siren Alarm
The circuit uses a LTC1799 precision frequency generator from Linear Technology.  A 74HC14 hex Schmitt trigger from Texas Instruments is also used to perform several other functions.  One section is wired as a simple 7Hz square wave oscillator.… [Designed by David A. Johnson]
American Police Car Siren (linscott) -  Scroll down to locate this circuit. The 555 on the right is wired as an alarm tone generator and the second 555 timer on the left is wired as a low frequency astable timer which generates a ramp waveform of about 6 seconds that is buffered....(electronic design added 08/08/08)
AN16 Automotive & Household Siren Driver Circuits: Zsd100 & Discrete 'H'-Bridge Minimum Parts Count Solution -  Zetec Semiconductors  Applications Notes A solution is provided that uses a minimum number of components by utilising an application specific signal generation IC, and a high efficiency 'H'-bridge effected with 3A DC rated Super-δ TO92 style switching transistors.   (app note added 6/06)
Assortment of Siren Circuits -  several circuits here, spend some time and view each of them

British Police Car Siren -  The first circuit simulates the siren of a British police car. It uses two 555 timers in the circuit. The 555 on the right is wired as an alarm tone generator and the second 555 timer on the left is a 1 Hz astable multivibrater....(electronic design added 08/08/08)

Electronic Police Siren -  The sound produced imitates the rise and fall of an American police siren. When first switched on the 10u capacitors is discharged and both transistors.… [Ron J.'s design]
Emergency Siren Simulator -  This siren circuit simulates police, fire or other emergency sirens that produce an up and down wail.  
Factory Siren -  This circuit produces a sound similar to a factory siren.  It makes use of a 555 timer IC used as an astable multivibrator of a center frequency of about 300Hz. The frequency is controlled by the pin 5 of the IC. When the supply is switched ON, the capacitor charges slowly and this alters the voltage at pin 5 of the IC hence....(added 05/07) [Radioland.nt.au]
One IC 2 Tones Siren Double Tone Police Sound Single Tone Old Ambulance Sound -  This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games. With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of Police....(added 6/06)
One IC Two-Tone Siren -  Double tone Police sound.  Single tone old ambulance sound.  (electronic circuit added 06/07/08) 
Police Car Siren -  This siren circuit simulates police, fire or other emergency sirens that produce an up and down wail.  
Powerful Siren -  Simple circuitry No ICs 12V Battery operation....
Red Alert Star Trek Alarm -  Scroll down to locate this circuit. The third circuit simulates the "Red Alert" siren from the TV show Star Trek. It uses two 555 timers in the circuit. The 555 on the right is wired as an alarm tone generator and the second 555 timer on the left is wired as a 1.5 second non-symmetrical....(electronic design added 6/07)
Screamer Siren -  This is a low-cost screamer circuit to add to our range of alarm modules. It has been designed to protect your valuables on a 24 hour basis…..(circuits added 06/09)
Screamer Siren - Light Controlled -  This circuit will produce an ear-piercing scream, depending on the amount of light being detected by the Light Dependent Resistor.
Simple Siren -  This project is built on the third section of the PC board, identified by "SIREN" and "Project 5." You will notice the similarity between this circuit and the LED FLASHER circuit from project 2. The only differences are the LED has been removed and the 22R resistor has been replaced by a mini speaker....(design added 04/09)
Siren 100dB -  This is a very loud siren and if two or more piezo's are located in a room, the burglar does not know where the sound is coming from….
Siren circuit -  This siren circuit simulates police, fire or other emergency sirens that produce an up and down wail.…(added 07/07/07)
Siren circuit (page 84) -  This circuit was requested by several correspondents. Its purpose was to obtain more power than the siren circuit already available on....(added 07/07/07)
Vehicle Car Siren -  This siren circuit simulates police, fire or other emergency sirens that produce an up and down wail.  

Siren Circuits


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