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Voltage Charging Indicator

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Linspire

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Guys,
How am I going to design voltage charging indicator for battery , the power supply source is from DC adapter to LM7805 ?
I have tried N-Mosfer series with LED from voltage regulator LM7805 which not really working as switching.


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Linspire
 

Try using a NPN transistor such as the 2N3904 as the switch instead of the NMOS. The transistor is current controlled unlike the gate of the NMOS which is voltage controlled. Make sure to put a resistor on the base and a resistor in series with the LED.
 

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