Hi,

Vary the current through the LED.  The intensity is nearly linear with
current over the normal operating range of most LEDs.

Best regards,
Dave

Micro Eng wrote:
>
> Just pondering this on my way to work...after being annoyed by some of the
> new LED based taillights
>
> If you want to vary the brightness of an LED, would it be better to vary the
> voltage, say a PWM circuit driving a voltage-follower transitor, or adjust
> the circuit voltage (ie the resistor using a digital pot) ?
>
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