I am making some disco lights for NYE, I have made a very simple circuit consisting of two BC547s, a 47k pot (really needs to be a low value but it is all I have in), and an electret microphone. It works well but the maximum current of the BC547s is only 100MA which to be on the safe side is only 4 LEDs. Ideally I want to add more, can I simply connect a MOSFET to the collector of the BC547 and use the MOSFET to drive the LEDs? Most my electronics hobby consists of Arduino stuff and it has been many years since I studied anaologue electronics. Thanks.