V.V. Badhrinath 6G

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Variable power supply circuit

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IR proximity sensoor

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IC 555 Ambulance Siren Circuit

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Destroyer Whooper Siren

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Pulsed IC 555 Alarm Circuit

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Monotone alarm

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AC 220V to 15V DC converter

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3 LED battery charge indicator circuit

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Buzzer circuit

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Variable power supply circuit

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Laptop charger circuit

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Visitor counter circuit