Electronic Siren diagram | Electronic Schematic Diagram https://electronicscheme.net Schematic Diagram & PCB Design Sat, 01 Oct 2011 05:56:28 +0000 en-US hourly 1 https://i0.wp.com/electronicscheme.net/wp-content/uploads/2017/05/cropped-transparent_text_effect.png?fit=32%2C32&ssl=1 Electronic Siren diagram | Electronic Schematic Diagram https://electronicscheme.net 32 32 129969089 Electronic Siren based NE555 https://electronicscheme.net/electronic-siren-based-ne555/?utm_source=rss&utm_medium=rss&utm_campaign=electronic-siren-based-ne555 https://electronicscheme.net/electronic-siren-based-ne555/#respond Sat, 01 Oct 2011 05:56:26 +0000 http://electronicscheme.net/?p=1418 Here the circuit diagram of electronic siren based NE555. This circuit produces a sound like factory siren. It applies a 555 timer IC which is […]

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Here the circuit diagram of electronic siren based NE555. This circuit produces a sound like factory siren. It applies a 555 timer IC which is utilized as an astable multivibrator of a center frequency of about 300Hz. The frequency is controlled by the pin 5 of the IC. When the power supply is switched ON, the capacitor charges slowly and this alters the voltage at pin 5 of the IC therefore the frequenct gradually increases.

When the capacitor is totally charged, the frequency no longer increases. Now, when the push button siren control switch is held depressed, the capacitor discharges and the siren frequency also decreases.The presets VR1 and VR2 needs to be adjusted for optimum capabilities.

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