INTRODUCTION
Importance of this circuit is in those areas , where is unregulated voltage supplies . As we know that we are using many electronic appliances in our daily life for both home and industrial purposes. Many of them only works on some suitable voltage range , and even over voltages can harm those appliances . If voltage indicator alarm is connected to same supply , if voltage increases from preset voltage then it beeps , then we can disconnect power supply,thus can protect our appliances.
PRINCIPLE
Zener diode can be used as voltage regulator to provide a constant dc voltage from a source whose voltage may vary appreciably .Variation in supply voltage give the net voltage(difference of regulated voltage and varied voltage) to relay, which in thus activates buzzer.
COMPONENTS USED
· Zener diode
· Transistor
· Diodes
· Electrolytic capacitor
· Relay
· Preset
· Transformer
· Buzzer
· Resistors
High Voltage indication alarm can be divided into two blocks
· Dc power supply
· Voltage regulator circuit
Voltage regulator circuit-The simplest voltage regulator uses just a resistor and a zener diode. In the circuit diagram you can see a resistor (R1) and a zener diode (CR1) connected across a power supply. The resistor is connected to the positive (+ve) supply wire and the zener diode anode is connected to the zero volt (ground) wire. At the junction of these two components the voltage is clamped by the zener diode to its specified voltage .
continued to OVER VOLTAGE REGULATOR 2
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