Jumat, 29 Maret 2013

Simple Police Siren

Posted by kumit on 09.45 with No comments so far

The simple Police Siren circuit uses two 555s 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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