POLICE SIREN

Published:2013/8/5 20:44:00 Author:lynne | Keyword: POLICE SIREN | From:SeekIC

The Police Siren circuit uses two 555's to produce an up-down wailing sound. The first 555 is wired as a low-frequency oscillator to control the VOLTAGE CONTROL pin 5 of the second 555. The voltage shift on pin 5 causes the frequency of the second oscillator to rise and fall.



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