Re: gEDA-user: LED in reverse

[Dan McMahill <dan@xxxxxxxxxxxx>]

Samuel A. Falvo II wrote:
> On 11/17/06, joeft <joeft@xxxxxxxxxxxxx> wrote:
>
> > If you are talking about a current applied in the "reverse" direction it
> > won't light up at all.  I haven't looked at the very bright LEDs that
> > have been marketed recently, but in general I would say that most LEDs
> > make lousy capacitors and won't store much charge at all.
>
>
> Actually, diodes and LEDs have been used for varacitors for some time
> now, especially in homebrew RF equipment.  They work quite well for
> this application.  However, because they're not built for use as
> varacitors, they're not *tested* to see how much capacitance they
> offer.  Consequently, they can have very wide tolerances.

Don't forget that diodes intended for use as varactors typically have a 
substantially different doping profile when compared to diodes intended 
for use as rectifiers.

-Dan



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