12v Led Dimmer Circuit Diagram

Lets say we want to run a total of 9 cree xp l leds at 700ma each with a voltage of 12v dc.

12v led dimmer circuit diagram. The forward voltage of each led at 700ma is 2 98v dc. 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. This will adjust the gate voltage. The potentiometer is connected with the mosfet s gate pin.

The circuit described above cannot be used with 12v mr16 led spotlights of the type we sell in the reuk shop. Using a dimmer with 12v mr16 led spotlights. Lets start with the series part of the circuit. This is a simple led dimmer that has only 2 components.

The light dimmer circuit that we finally arrived at can easily drive 6 lamps of 10 w each. While individual led bulbs are completely unharmed by being turned on and off rapidly the internal circuitry of the spotlight unit does not appear to like it at all. How does the 12v strip dimmer circuit works. L1 and s1 can be adapted to suit a smaller current if required.

In any case the total current has to be smaller than 10 a. Rule number 2 from the series circuit bullet points proves that 12v dc isn t enough voltage to run all 9 leds in series 9 x 2 98 26 82v dc. One is an n channel mosfet and a potentiometer. As soon as i applied led power the brightness blinded me much brighter than the original t20 fluorescent tube so i knew immediately that a dimmer control was required.

Fewer are also possible of course. Note that the whole circuit will also work from 6 v. 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. Now rotate the potentiometer.