123ArticleOnline Logo
Welcome to 123ArticleOnline.com!
ALL >> Writing >> View Article

Ne556 Police Siren Sound Generator Circuit

Profile Picture
By Author: Jennie
Total Articles: 1
Comment this article
Facebook ShareTwitter ShareGoogle+ ShareTwitter Share

This is an extremely simple circuit that can produce a siren sound similar to that of an American police car. The alarm lights will flash simultaneously when the alarm sounds. This circuit can provide a load greater than 1A, can drive several lights or high-power loudspeakers, this circuit will produce considerable sound and light.

This circuit consists of two astable multivibrators. NE556 is used here instead of the commonly used 555. You can also use two separate 555s, if you think this is more suitable for you. Both timer chips are set up as non-steady-state multi-resonant circuits.

First, the timer chip (as shown in the figure below) generates a 2Hz square wave signal at pin 9 by setting the parameter values ​​of R1, R2 and C2, and controls the on and off of the power transistor T1 to control the on and off of the warning light La1. Secondly, the timer chip (as shown in Figure 1) sets the values ​​of R4, R5 and C4, and generates a square wave at pin 5 to drive the loudspeaker LS1. The switching voltage generated by the first timer pin 9 periodically charges and discharges the electrolytic capacitor ...
... C3 through R3, and C3 is connected to the second timer control input pin 3 to make it work on the VCO (voltage controlled oscillator). The result is a periodic square wave that causes the loudspeaker to rise and fall, producing a realistic police siren sound, as you often hear in movies.
More information:

Total Views: 34Word Count: 246See All articles From Author

Add Comment

Writing Articles

1. How To Guide For Effectually Writing A Publishable Research Manuscript – Pubrica
Author: Pubrica

2. Know About Apegs
Author: David Thomas

3. Professional Engineers Ontario (peo)
Author: David Thomas

4. How To Avoid Plagiarism While Ensuring The Originality Of Their Manuscript – Pubrica
Author: Pubrica

5. The Best Solution For A Better Tomorrow In Custom Packaging
Author: Gibbs Ryan

6. Tametic Keyword
Author: kiran

7. What Do You Need To Be A Chartered Engineer?
Author: David Thomas

8. How To Deal With Improper Or Unethical Peer Review – Pubrica
Author: Pubrica

9. Nsw Fair Trading Warns Consumers To Avoid Two Unlicensed Operators
Author: David Thomas

10. Procurement Of Medical Devices In Countries: A Protocol For A Systematic Review – Pubrica
Author: Pubrica

11. Some Important Points On The Course Of Technical Writing Guide
Author: Robert Hogan

12. 5 Tips About Websites To Check Plagiarism
Author: rsneha

13. How To Finalize Mesh Terms |guidelines For Searching Articles - Pubrica
Author: Pubrica

14. Mẫu Ghế Massage Phù Hợp Cho Người Già
Author: Haruko Việt Nam

15. How To Extract Data From Your Paper For Systemic Review – Pubrica
Author: Pubrica

Login To Account
Login Email:
Forgot Password?
New User?
Sign Up Newsletter
Email Address: