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i want ckt and brief description on topic 4 tone sirens.

[Image: four%20tone%20siren%20circuit.gif?189db0]

UM3561 IC includes oscillator circuits and selector so few external component is used for the construction of the four-tone siren.
The UM3561 contains mask ROM programmed to simulate the sound of the siren. The power consumption of IC is low.It is powered by 3 volts. An NPN transistor is used for amplification of the audio signal.

This circuit gives the sound of the police siren, the siren of the ambulance, the siren of the firefighter brigade and the sound of the machine gun.

Parts List :

• IC UM3561
• Resistance = 220 ohms
• 100Mfd Capacitor
• Transistor BC548
• 3V Battery Container
• Switches

Seminar Topics & Project Ideas On Computer Science Electronics Electrical Mechanical Engineering Civil MBA Medicine Nursing Science Physics Mathematics Chemistry ppt pdf doc presentation downloads and Abstract

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