[sdiy] Driving LEDs from CMOS

[Ingo Debus]

DCMagnuson at aol.com wrote:
> I'll be increasing the resistor between the Q output and the transistor base.
>  If that still doesn't work I'll try using a CMOS buffer in between the two.

IMHO there's no reason to use a transistor stage to drive a LED from a
logic output nowadays. There are low current LEDs available, they are
nice and bright with only 2 mA. A little bit more expensive, but still
cheaper than conventional LED + trannie + resistor.

Ingo