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Kitsnspares - Power Supply Failure Alarm [ Beginner Electronic Project Kit ]

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Rs :200/-
Shipping Weight For Freight Calculation: 0.09 kg
Back To Back - Kindly Email / Use Live Support [ Call-9815000133] To Order

 

The Power Supply Failure Alarm indicates power supply failure by sounding a buzzer. The circuit requires no external DC supply and the power-on condition is indicated by a red LED. No. of ICs used: None

 

Description:

 

The Power Supply Failure Alarm employs an electrolytic capacitor to store adequate charge to sound an alarm for a reasonable duration when the mains supply fails. During the presence of mains power supply, the rectified mains voltage is stepped down to the required voltage level. A zener diode is used to limit the filtered voltage to 15V level. The presence of AC mains is indicated by a red LED. The low-level DC is used for charging a capacitor (C3) and reverse biasing the switching PNP transistor BC558 (T1). Thus, transistor T1 remains cut-off as long as the mains supply is present. As soon as the mains power fails, the charge stored in the capacitor acts as a power-supply source for transistor T1. Since, in the absence of mains supply, the base of transistor is pulled ‘low’ via a resistor (R8), it conducts and sounds the buzzer to generate an alarm indicating of power-failure.

 

Warranty : As Per Policy [ Of The Parent Company Taken Care By Service Center ]

 

Note :

         If [ Backordered] From HO Takes Min 3 To 7 Days Time Frame To Arrange

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