Sunday, August 5, 2012

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Siren Generator Circuit Using UM3561 IC

UM 3561 is a low cost siren generator designed for use in toy applications. The UM 3561 IC can generate Multi siren tones simulating Police siren, Ambulance siren, Fire brigade siren and Machine gun sound. The IC has an inbuilt oscillator and tone selection pins. It is easy to make a siren generator with only a few external components. Only one external resistor and a speaker driver transistor are sufficient to make a simple siren generator.
UM3561 vSiren Generator Circuit
UM3561 Pinout
By changing the pin connections of Sel.1 (Pin6) and Sel. 2(Pin 1) it is easy to change the siren tones.
Sel 1Sel 2Tone
Pin 6 Pin 1
NC NC Police siren
+3V NC Fire Engine sound
Gnd NC Ambulance Siren
NC +3V Machine Gun sound

Supply voltage Min. 2.4VTyp 3V Max 3.5V
Operating current Min - -180 uA

for more details about UM3561 Siren Generator Circuit please visit

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