In article ,
Roger Hayter wrote:
Brian Gaff wrote:

This sounds like a simple circuit charging up a capacitor to bias on a
transistor. The problem probably is that the settings used assume a
lower resistance load than the led. It depends if its using someform
of feedback to achieve the more smooth gradual illumination.
Brian

Nowadays such things are more often done with a microprocessor. It is
probably actually cheaper than the high value stable capacitor you would
need tor the analogue timer. My bathroom fan does its timer this way,
making modifying its behaviour a work in progress.

Could well be. Have looked to see if there are any dedicated chips for
this job - but so far no luck.

--
*If we weren't meant to eat animals, why are they made of meat?

Dave Plowman London SW
To e-mail, change noise into sound.