Potentiometer Controlled LED

In other not to get your LED fried you have to cater for the maximum voltage that reaches your LED. The potentiometer, when rotated to brighten the LED can allow the full source voltage to go across the LED. And in the diagram above, the source voltage is 9volts and that’s too big for the LED.

The solution to this is very simple. Before you ground the LED by connecting its cathode to the negative of your source voltage, connect a series resistor it. 220 ohms will work perfect.

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