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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It is a low cost and low powered 8 pin IC. We can change the frequeccy by rotating the knob of variable resistor. Mat switch can be used as a security measure in a restricted area. Click here for instructions on how to enable JavaScript in your browser. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. Get Our Weekly Newsletter!

It is used for amplification and switching purposes. The DC current gain varies in range to It has inbuilt oscillator and sound selector circuit, It requires few components to produce output. Arduino based GPS receiver. Resistor Resistor is a passive component used to control current in a circuit. Its resistance is given by the ratio of voltage applied across its terminals to the current passing through it.

When an electric signal is applied to the input pin of speaker, it generates sound waves. Thus a particular value of resistor, for fixed voltage, limits the current through it. While building circuits many times we need to generate sounds like a musical sound or some kind of alerting sound.

Three Siren Sound Generator Circuit Using UM3561

The zener diode ym3561 connected directly to the 9 volt supply. The charge q stored in a capacitor is the product of its capacitance C value and the voltage V applied to it. This voltage is called Breakdown Voltage or Zener Knee voltage. A loudspeaker or “speaker” is a transducer that converts electrical energy into acoustical energy. This high-density System-in-Package SiP integrates controller, power switches, and support components.


With some basic mistakes just as in your circuit the beginners will get disheartened when there ckt doesn’t work. You can also increase the number of jm3561 to increase the capability of the circuit.

Liquid level Alarm using transistor and timer IC. UM Pin diagram and Pin description is given below, taken from its Datasheet: Zener Diode is just like the other diodes, with only one difference.

UM Siren Sound Generator COM22 – Faranux Electronics

This high is provided to Darlington pair transistor T4, T5 and the loudspeaker connected to it starts sounding. This switch, when hidden under the floor mat, triggers an alarm when the person walks over it. Step-By-Step 1 2 3 reads. Assemble the circuit and mount the switches under the mat. By using single IC UM we can build three u,3561 sound generator circuit.

It is also used as a complement for transistors 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. It is used in switching and amplifier applications. The output generated uc the IC is not sufficient to drive a 8ohm small speaker, so to amplify the output of the IC, a transistor must be used at the output PIN 3.

Below is the table for 4 Playing modes, you can produce whatever sound you want. There should be a resistence of 1K. Skip to main content. BC is a general purpose PNP transistor.

Currently you have JavaScript disabled. They are omnipresent in Interface SD Card with Arduino. Choosing Battery for Robots. It can easily drive magnetic speaker with a help of single NPN transistor. As we have used 9v battery, km3561 we have used Zener Diode 3. It has inbuilt oscillators and circuitry to produce the sounds, and only require one external resistor.


Group all Htabs Electronics. What is Web Browser. UM works in the range of volts, voltage higher than 5V can damage the IC, so if we are using it with other circuit or using a high voltage source, a Zener diode must be connected, to protect the IC. Log in or register to post Comment. 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.

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 is generally used in alarms and toys. In the circuit, UM IC generates a tone similar to police siren and resistor R6 is used to control its oscillation. By applying these bias to the SEL pins we can get different um361 sound effect. BC is general purpose silicon, NPN, bipolar junction transistor.

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The UM has 8 pins, and it can intake 3 to 5V as a power supply and gives output range