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International Journal of Innovation and Scientific Research
ISSN: 2351-8014
 
 
Wednesday 26 September 2018

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Design and Implementation of a Variable Pulse Tone Generator Based Alarm System for Emergency Signaling


Volume 25, Issue 2, July 2016, Pages 405–412

 Design and Implementation of a Variable Pulse Tone Generator Based Alarm System for Emergency Signaling

Ehiagwina Ojiemhende Frederick, Seluwa Emmanuel Oludare, Kehinde Oluseye Olufemi, Afolabi Lateef Olashile, and Yakub Bolaji Jamiu

Original language: English

Received 19 April 2016

Copyright © 2016 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract


The pulse tone generator provides one with the application of two 555 timers, resistors, electrolytic capacitors and a power source, all being connected together on a Vero board. This project attempted to incorporate into previously developed pulse tone generator useful features such as making the circuit simpler, variation to the tone by means of a variable resistor knob. A polyvinyl chloride (PVC) case is used as against metallic casings used in some previous works. In this project, a regulated dc power supply starting with a 220/12 volt, 500VA step down transformer is used to power the circuit. When the circuit is connected to the power source, the 555 timer IC triggers the loudspeaker to emit a loud audible sound. This sound will stay on for as long as the circuit is connected to the dc power supply. The component and circuits was tested and the design was implemented and realized.

Author Keywords: 555 timer, alarm system, emergency signaling, multivibrator, pulse tone generator.


How to Cite this Article


Ehiagwina Ojiemhende Frederick, Seluwa Emmanuel Oludare, Kehinde Oluseye Olufemi, Afolabi Lateef Olashile, and Yakub Bolaji Jamiu, “Design and Implementation of a Variable Pulse Tone Generator Based Alarm System for Emergency Signaling,” International Journal of Innovation and Scientific Research, vol. 25, no. 2, pp. 405–412, July 2016.