If you use a 10K resistor then the current flowing through the zener is=
 about 800 uA
which is very very low for most zeners. I think that your zener does not=
 even reach its
designated zener voltage of 16 V. Maybe try a smaller resistor of say 1K.

*********** REPLY SEPARATOR  ***********

On 02/06/2003 at 14:59 Chuck Harkness wrote:

>Just can't quite get my brain around this.  This is not a
>"homework" question.  I'm a hobbiest. I've tried to research
>it using web and books.  Maybe this is one of those "duh"
>questions, but I just can't get it.
>
>Let's say I have:
>24V supply
>Capacitor in parallel with a 16V zener
>10K resistor between supply and capacitor/zener
>Capacitor is discharged to 8V
>
>In calculating time to recharge the capacitor, is the
>capacitor:
>a) charging through the 10K resistor toward 24V potential
>until it hits 16V, at which time it's limited by the zener?
>or
>b) charging toward a 16V potential through ?? resistance?
>or
>c) ?????
>
>Thanks
>Chuck Harkness
>
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~~~~~~~~~~~oOo~~~~~~~~~~~
Ofer Safeman, M. Sc.
Senior Design Engineer

Paragon Communications
6 Pal-Yam
Haifa, 33095
ISRAEL
Phone: +972-4-8642775
Fax: +972-4-8642737
E-Mail: ofer@paragoncommtech.com

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