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.


--

Roger Hayter