Here is a very easy and useful schematic of an LED dimmer circuit. The circuit is using a famous voltage regulator IC LM317T. This IC can also be used as a current regulator, like it is used in the following circuit.
The LEDs are current driven light emitting diodes, so there brightness cannot

be controlled by voltage, you can control their brightness by limiting their current.
In this circuit we have used 10 super bright white LEDs, but the number of LEDs can be increase if desired. The 200 ohms variable resistor is used to control the current or brightness of LEDs. The total output current of LM317 is 1.5A, due to which we have used a separate current limiting resistor with each LED which will protect them on the maximum current output from the IC.
The circuit can be operated with 9V to 12V DC but you can also operate it with 6V by changing the values of resistors R2 to R11 to 290 Ohms.

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LED Dimmer Circuit Schematic