On Mon, 25 Feb 2002, Dale Botkin wrote:

> On Mon, 25 Feb 2002, Vasile Surducan wrote:
>
> >   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...
>
> If I were going to produce and market something like this a a commercial
> product, I'd probably go cheap and simple.  Since it's a one-off just for
> my yard lights, and something for me to have fun with, I'll play with some
> new stuff.  The transformer is a given, it's already there, and the parts
> are all in my junque box as it is - other than the MOSFETS, which ar
> cheape than a relay anyway.  Besides, I already *know* how to drive a
> relay, no challenge in that! 8-)
>
  Agree, for this particular project. However designing a startup
saturating transformer is a challenge !

best, Vasile

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