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automatic change over switch pdf


#1

To get full information or details of automatic change over switch please have a look on the pages

http://project-seminars.com/showthread.p...&tid=82972

http://project-seminars.com/Thread-devel...ver-switch

if you again feel trouble on automatic change over switch please reply in that page and ask specific fields in automatic change over switch
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#2
I need a Literature Review on Automatic Single phase Changeover using relays
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#3
eR8Zd
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#4

Many electrical and electronic devices require DC or AC power for their operation. While AC power is mainly available through the AC mains, DC power is available through batteries. However, there are circumstances where there is a shortage of AC power (through a power failure) or DC (due to limited battery life). To overcome this problem, we generally find many alternatives. For example, we can use generators or inverters in emergency cases to obtain AC power when the power supply is disconnected. Similarly, in the case of DC power, we can use a battery or an AC to DC power supply alternatively.

Automatic shift switch circuit principle:

This circuit is based on the principle of 555 Timer bistable mode operation. In this mode, the timer output is high or low depending on the status of the trigger and the reset pin. The output of the timer is connected to a transistor that acts as a switch, which is on or off, depending on the output of the timer. Two LEDs in series are used as load. In case the transistor is off, the LEDs are powered by the AC-DC power supply, whereas in case the transistor is switched on, the LEDs are driven by the battery.

Circuit Diagram of Automatic Shift Switch:

[Image: Automatic-Changeover-Switch-Circuit-Diagram-768x440.jpg]
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