Tom=E1s =D3 h=C9ilidhe wrote:
> I could use a simple bi-polar junction transistor such as a BC327 but
> then I'd need a resistor for the base. And because I've got 12 of
> these LED's, that would mean 12 more resistors on my board, so I'd
> rather go for an option that doesn't require a resistor.

A small resistor doesn't seem like much when you've already got a
transistor, LED, and another resistor replicated 12 times.

But, a easy solution is to use a NPN emitter follower and adjust the LED
resistor for 4.3V drive instead of 5V drive.


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