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This is a very quick item to get me going again and back into the habit of blogging.   When jancumps showed us a one-transistor current source in Simple Electronic Control Systems - Current Control with 1 transistor , I used it to drive an LED (see the comments to that blog). The current switched pretty quickly and I wondered how it would compare to driving a simple resistor: just how fast can an LED be? Simple way to find out was to try it, so here's a shoot-out between a blue LED and ...