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Electronic ship siren multivibrator circuit

2017-08-15 12:49  
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A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as oscillators, timers and flip-flops. It is characterized by two amplifying devices (transistors, electron tubes or other devices) cross-coupled by resistors or capacitors.Amultivibrator circuitis a circuit that has identical components arranged on the left and right hand sides.The circuit consists of a multivibrator (Ql & Q2), and a low power output stage Q3. The speaker should have an impedance in the region of 40 to 80 ohms. To use a low impedance speaker, connect an output transformer from the emitter of Q3 to ground. Cl and C2 determine the pitch of the siren and the values specified will provide a tone of about 300 Hz. Quiescent current is negligible.The output at the collector of Q2 can also be fed into an amplifier input via a electrolytic, in series with a 12k resistor.A ship gives warning with a loud fog horn. Excellent ship horn or whistle sound effect. Typical ship horn sound when in a dense fog situation.
 

Electronic ship siren