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Slow On Off (brightening/dimming) LED with Caps?

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R2-D2

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I'm not sure about this but wondered if the attached simple circuit would work. You can slowly dim an LED with a cap in parallel to it (and its resistor) when you turn it off but the trick is to slowly turn the LED back on (slowly brightens). I thought some arrangement of cap, resistor and/or inductor would do the trick. I don't have a high value cap to experiment with. :eek:

Of course with caps, the charging and discharging curve is not linear.
I'm just trying to make this simple without having to use a PWM circuit but maybe I have to. :(

Any suggestions???
 

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