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A factory siren circuit diagram Introduction

2017-08-15 17:33  
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Here is a factory siren circuit diagram introduction. With text to understand the schematic diagram will be more efficient to understand oh. The circuit is simple and very practical. This circuit generates a sound similar to the factory siren. It uses a 555 timer  IC as an astable multivibrator of a center frequency of about 300 Hz. A capacitor is fully charged, the frequency is no longer increases. Now, when the button is pressed siren control switches, capacitive discharge and the alarm frequency is also reduced. Presets and VR2 VR1 should be adjusted for optimum performance. Frequency control pin 5 of the IC. When the supply is turned on, the capacitor charges, which changes the voltage at pin 5 of the IC slowly so frequenct gradually increased.

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