Siren Generation Using IC UM IC UM is a siren generator IC generally used in alarms and toy applications. Depending on the selection, it can. UM includes oscillator and selector circuits, a compact sound module can be constructed with only a few additional components. A. A brief overview of the UM IC. UM is an excellent ROM IC that can generate Multi siren tones simulating Police siren, Ambulance siren, Fire brigade .

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Select line 1,2 are connected with three push to ON switch and oscillator pin 7, 8 are connected with variable Resistor VR1 and R1 to maintain oscillation.

Also check the luggage security alarm circuit.

You can also increase the number of switches to increase the capability of the circuit. By applying these bias to the SEL pins we can get different siren sound effect. UM Pin diagram and Pin description is given below, taken from its Datasheet:. Siren Sound generator circuit can be utilized in several applications, different siren sounds are used for many field based applications, here the following circuit can produce three different siren sounds Police siren, Fire engine siren, Ambulance siren.

It is generally used in alarms jc toys. With some basic mistakes just as in your circuit the beginners will get disheartened when there ckt doesn’t work. We can change the frequeccy by rotating the knob of variable resistor.


This high-density System-in-Package SiP integrates controller, power switches, and support components. When anyone presses the switch, the signals are provided to the base of the transistor T1.

Resistor Resistor is a passive component used to control current in a circuit. It will help your sound based or alarm based electronic project. When an electric signal is applied to the input pin of speaker, it generates sound waves. Choosing Battery for Robots. Leave Open for Normal Operations. Get Our Weekly Newsletter! Just put the switches beneath the mat after regular intervals so that when anybody who puts his feet on switch will engage the alarm.

UM3561 Siren Sound Generator COM22

There should be a resistence of 1K. While building circuits many times we need to generate uc like a musical sound or some kind of alerting sound. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page.

Hi buddy there is basic flaw in circuit.

This switch, when hidden under the floor mat, triggers an alarm when the person walks over it. UM Pin diagram and Pin description is given below, taken from its Datasheet: The charge q stored in a capacitor is the product of its capacitance C value and the voltage V applied to it.

UM Sound Generator IC Pinout, Circuit & Datasheet

BC is general purpose silicon, NPN, bipolar junction transistor. This website uses cookies to improve your experience.


It is a low cost and low powered 8 pin IC. BC is a general purpose PNP transistor. The DC current gain varies in range to Log in or register to post Comment. Mu3561 UM has 8 pins, and it can intake 3 to 5V icc a power supply and gives output range We’ll assume you’re ok with this, but you can opt-out if you wish. It has inbuilt oscillator and sound selector circuit, It requires few components to produce output.

The other pin is connected to ground. The zener diode is connected directly to the 9 volt supply. When there is no switch is pressed then police siren will generate at output pin. All the diodes allow flow of current in only one direction forwardbut Zener diode can allow current in reverse direction if the voltage goes beyond a certain limit.

It can easily drive magnetic speaker with a help of single NPN transistor.

Three Siren Sound Generator Circuit Using UM

Zener Diode is just iic the other diodes, with only one difference. Click here for instructions on how to enable JavaScript in your browser. Step-By-Step 1 2 3 reads.

Your email address will not be published. This voltage is called Breakdown Voltage or Zener Knee voltage.