This Minor Project Research is based on signal processing using common laboratory electronic chips. The generated signals were caused to pass through appropriate electronic circuit compartments to obtain the desired signal waves that produced siren effects. The Multi-Tone Siren is a siren which produces five different audio tones and is much more ear catching than a Single-Tone Siren.In this project the use of inductors and resistors with appropriate capacitor values for their timing constants and produced the same effects with improved frequency presented in the circuit. The designs deviate from the customary in the sense that they could be used in both survey and practical course. Hence, the project satisfies the increasing students' curiosity in electronics which creates such awareness that the primary forces impelling social and cultural changes are largely the result of technological innovation.
Multi-Tone Siren is a siren which is used in our present time as security purpose for the welfare of different societies. The growing rate of crime, disorderliness and emergencies in our society today demands that extra care should be taken to check the excesses. One of the ways to check these excesses is to introduce a special control-order that informs and alerts the public utilizing an identifiable but unique security engineering feat that should be associated with the public security. Success in this feat involves electronics circuit configuration in the form of high frequency multi-tone siren designing.
The Multi-Tone Siren is useful for burglar alarms, reverse horns, etc. It produces five different audio tones and is much more ear catching than a single-tone siren.
The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio amplifier LM386. IC 4060 is used as the multi-tone generator. A 100μH inductor is used at the input of IC 4060. So it oscillates within the range of about 5MHz RF. IC 4060 itself divides RF signals into AF and ultrasonic ranges. Audio signals of different frequencies are available at pins 1, 2, 3, 13 and 15 of IC 4060 (IC1). These multi frequency signals are mixed and fed to the audio amplifier built around IC LM386. The output of IC2 is fed to the speaker through capacitor C9. If you want louder sound, use power amplifier TBA810 or TDA1010. Only five outputs of IC1 are used here as the other five outputs (pins 4 through 7 and 14) produce ultrasonic signals, which are not audible. Assemble the circuit on a general- purpose PCB and enclose in a suitable cabinet. Regulated 6V-12V (or a battery) can be used to power the circuit.Multi-tone security siren provides an emergency but electronic alarm; which differentiates multi-alarm from other security services tones in the society. It is one of the designs borne to boost in no small measure the numerous activities of human endeavor in electronics engineering. It is believed that the society is growing wide and complex. Therefore, if sanity should be maintained, greater consciousness directed towards human-kind welfare and security should be emphasized.On the other note, the growing emphasis on engineering and technology has come to lime light judging from students' enrolment population in the fields and the consumers' usage of engineering and technological products. Hence, to satisfy such curiosity, it becomes pertinent that a project in this capacity which may tend to inform the learner on the basic practices guiding some of the electrical/electronic circuit operations should be thought of.
Moreover, the man's ability to secure himself from danger or problem is as old as history. Human-kind has dug trenches around their living homes to ensure security. String has also been tied around a protected item through a bell such that if the string is mistakenly touched, the bell would ring thereby provoking the owner's attention. But in most cases, these systems of providing security did not ensure adequate security since such designs could be averted by an intruder. Hence, this security system design is, therefore, needed.
The electronic sirens do not have motional parts. This is why it is more advantageous than other forms of security siren, since it is less prone to tears and wears when compared with the electromechanical and mechanical kinds of siren. The electronic siren system utilizes less amount of current from the power source. It also has an added advantage that different or multi-tone could be produced using a single circuit.