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Basic Electronics » Cannot understand the pins

March 27, 2013
by oshjdf
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The only pin that I can understand is pin 3 which is ground. What pin 1 and 2 stand for? Thanks..

March 27, 2013
by rajabalu21
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Pins 3 and 2 make switch. If you plug in the external power then the connection between 3 and 2 is broken. Pin 1 could be +ve supply and Pin 2 could be ground. Pin 3 could be battery's ground. When external plug from power supply is not plugged in then the battery is connected and the device will be powered. If you plug in the external supply then the battery is disconnected and power from external source will get applied to your circuit.

-Raja

March 27, 2013
by oshjdf
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So, it means that if I do not want to use battery, pin 3 should be left open?

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