On Fri, 22 Feb 2002, Dale Botkin wrote:

> On Fri, 22 Feb 2002, Dave Dilatush wrote:
>
> > If you want soft-start for those yard lights, one easy way to obtain it
> > would be to put an RC low pass filter between the MOSFET gates and the
> > PIC pin doing the control; something with a time constant of a few
> > hundred milliseconds or so.
>
> Not a bad idea, I may do that.
>

  There are many bulb producers, for example chinese ( veeery cheap )
bulbs needs more than a few hundred milisecons for safetly heating. And we
go back, what is cheaper for a production, a transformer, two mos-fets,
one pic, some software for pwm, some filtering, and so and so, or a good
designed transformer ( saturated core at power-up ) and a relay/scr in
primary coil ? Everything you will say the truth is just one...

best regards, Vasile

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