You can use a MOSFET or a transistor -- they're much faster than relays. Here is one circuit idea using a transistor:http://ruggedcircuits.com/html/circuit__19.htmland another using a MOSFET:http://ruggedcircuits.com/html/circuit__11.htmlThe details will differ depending upon your circuit (15V, 700mA) but the overall configuration shows you what to expect.--Thank you so much, I've found that site http://www.electronics-tutorials.ws/transistor/tran_7.html that shows the same that you says. I think I need a P channel mosfet if I want to place my led between something and ground, so I will use the NDP6020P I hope I found it in Argentina.Thanks The Rugged Audio Shield: Line In, Mic In, Headphone Out, microSD socket, potentiometer, play/record WAV files
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