hey electronics twitter what's the easiest way to control (not just on/off, but analog control) a ~3.3V LED from my ~3.3V microcontroller, using a ~4V signal. a transistor doesn't seem to work bc the voltage drop results in emitter voltage being ~3.3V-0.7V=2.6V which is too low
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I think instead of trying to use the emitter / source to drive, you put the LED on the high current rail directly, and drain / collector the other end
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huh, does that actually change it??? i'll try that
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forgot the ground to the board too, but i suppose that's implied enough
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Generally you want the NPN transistor between the cathode of the LED and ground, that is because base current is a relative to ground. An n-channel MOSFET would be in the same place. But would not turn on because it needs more gate drive.pic.twitter.com/qV2yIQaILa
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