Chen Xiao Fan wrote:
> Cannot agree more with you on the power supply design. It only
> serves the purpose of demonstrating the nice use of PIC 10F
> as a SMPS controller but it can not beat a simple SMPS
> controller.

It does in price.  I've been down this route a few times and the 10F
solution has come out cheaper.  I've got similar circuits in several volume
products, and they work very nicely.

> a simple 9V supply with a 7805 will be the cheaper
> and more robust design.

Yeah, I've been hearing this a lot.  I think the cost differential is less
than people imagine, but I agree it would still be cheaper.  My main
motivation was to have flexible input voltage requirements.  It would be no
problem to specify 9V DC in and use a 7805, but would that really cost less
since the external supply would cost more?

I'm going to carefully price out a few complete solutions (wall wart and
all) and see where things come out.  How much is flexible input power
requirement worth?


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