Monday, December 28, 2015

Circuit Diagram Power Supply Failure Alarm

Robotronicdiagram. - Here is Circuit Diagram Power Supply Failure Alarm like in Figure 1 below. The main component in this Power Supply Failure Alarm is transistor as switch on/off principle. With this circuit diagram you can monitor your power supply from failure easily. In here we will show you also the component part ans simple description of this circuit diagram. 

Circuit Diagram 

Figure 1. Circuit Diagram Power Supply Failure Alarm (

Component Part
  1. Resistors
  2. Diode
  3. Capacitor
  4. Variable Resistor
  5. Buzzer
  6. Transistor BC558

Circuit diagram like in Figure 1 above is Circuit Diagram Power Supply Failure Alarm. According site describe that Most of the power supply failure indicator circuits need a separate power supply for themselves. But the alarm circuit presented here needs no additional supply source. It employs an electrolytic capacitor to store adequate charge, to feed power to the alarm circuit which sounds an alarm for a reasonable duration when the supply fails.

This circuit can be used as an alarm for power supplies in the range of 5V to 15V. To calibrate the circuit, first connect the power supply (5 to 15V) then vary the potentiometer VR1 until the buzzer goes from on to off.

Whenever the supply fails, resistor R2 pulls the base of transistor low and saturates it, turning the buzzer ON.

Please read more this article from original source about Circuit Diagram Power Supply Failure Alarm using link Here.

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