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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When switched on, they behave like a small (<1ohm) resistor, so should have a much lower voltage drop.
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FETs are high (input) impedance: low-loss on that side.
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AIUI they actually work like you'd want them to. Search for "BJT vs MOSFET". Also seehttps://electronics.stackexchange.com/questions/13079/when-is-a-mosfet-more-appropriate-as-a-switch-than-a-bjt …
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