ELECTRONIC_SHIP_SIREN

Published:2009/7/6 5:40:00 Author:May | From:SeekIC

The circuit consists of a multivibrator (Q1 & 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. C1 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 1 pF electrolytic, in series with a 12 k resistor.



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