PWM on a high power led

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hi, have high power led (3w) has constant current power supply(700ma). i've tested power supply , it's fast, can turned on , off in miliseconds, , works voltage 4 15v. how can drive digital pwm signal? need relay faster. 

thanks , sorry english

you can use mosfet or transistor -- they're faster relays. here 1 circuit idea using transistor:

http://ruggedcircuits.com/html/circuit__19.html

and using mosfet:

http://ruggedcircuits.com/html/circuit__11.html

the details differ depending upon circuit (15v, 700ma) overall configuration shows expect.

--
the rugged audio shield: line in, mic in, headphone out, microsd socket, potentiometer, play/record wav files


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