Thank you for everyone for taking the time to explain the calculation.
Previously I had looked at one electronics book, the charge time was =
written
as t =3D RC (charge constant).  Also, there were the formulas given by =
some of
you.  However, untill now it wasn't clear to me.

On a slightly different topic:
The capacitor charge time on my circuit is about 200us.  When I heat the
circuit up to about 60=B0C (140=B0F), the time decreases to 32us.  I use
different resistors; however, the time decrease seems to be constant.  =
This
is probably because of the capacitor, it is effected by the heat too =
much.
I have heated up the resistors separately to the same heat, that did not
have any effect on the charging time.  Is there a capacitor that is not
effected from temprature changes?  I am using 100nF capacitor.

Best regards,

Omer YALHI
oyalhi@teksan.com.tr
http://www.teksan.com.tr

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