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if ....etc

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circuit diagram of over under voltage protectn of electrical applicatins using lm324 ....etc

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REGULATED POWER SUPPLY
1.1 Types of Power Supply
There are many types of power supply. Most are designed to convert high voltage AC mains electricity to a suitable low voltage supply for electronic circuits and other devices. A power supply can by broken down into a series of blocks, each of which performs a particular function.
For example a 5V regulated supply:
Figure 1.1 block diagram of a regulated power supply
Each of the blocks is described in more detail:
Transformer- steps down high voltage AC mains ....etc

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to get information about the topic under over voltage cut out using transistor RELATED TOPIC REFER THE LINK BELLOW

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high low volt cut off with delay alarm circuit ppt for pdf

Abstract

This straight forward circuit will protect electrical appliances from over voltage as well as under voltage. The circuit also produces an alarm when the power supply comes back. An ideal circuit for home to protect your valuable equipments from voltage fluctuations. The same circuit with some modifications can be used to make a automatic voltage stabilizer.

When the mains voltage is in the normal level, the voltage at the negative terminal of zener diode D4 will be less tha ....etc

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CHAPTER 1: INTRODUCTION
Here is an inexpensive auto cut-off circuit, which is fabricated using transistor and other discrete components. It can be used to protect loads such as refrigerator, T.V., and VCR from undesirable over and under line voltages, as well as surges caused due to sudden failure/resumption of main power supply. This circuit can be used directly as a standalone circuit between the mains supply and the load, or it may be inserted between an existing automatic/manual stabilizer and the load.
The over/unde ....etc

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project reports on high and low voltage protection with delay and alarm
project reports on high and low voltage protection with delay and alarm ....etc

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To get full information or details of high low voltage cut off with time delay please have a look on the pages

http://seminarsprojects.net/Thread-high-and-low-voltage-cut-off-with-time-delay

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To get full information or details of high low cut off circuit using lm324 please have a look on the pages

http://circuitsgallery2014/02/voltage-stabilizer-circuit.html

http://circuitsgallery2014/01/battery-charge-controller-circuit.html

http://homemade-circuits2011/12/simple-mains-high-and-low-voltage.html

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literature reviews on automatic voltage regulator

A voltage regulator is designed to automatically maintain a constant voltage level. A voltage regulator may be a simple feed-forward design or may include negative feedback control loops. It may use an electromechanical mechanism, or electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages.

Electronic voltage regulators are found in devices such as computer power supplies where they stabilize the DC voltages used by the processor and other elem ....etc

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