From: John Tserkezis 
Reply-To: Fidonet AVtech Echo 

Bob Lawrence wrote:

>  You and Brenton need a reality check. David's not going to *ever*
> finish building this thing. You've got to be practical. Even my idea
> of a 6V bike battery and a 5W light bulb is a bit over the top. He'll
> have to plug it into a the cigarette lighter, and if David's anything
> like me, he'll buy the plug and never wire it up.
>  SMPS on a PCB? Get real!

  I've done it several times.

>  Yair. These little fuckers are 50% efficient if you're lucky, and

  60% if you stuff it up, though I don't think better than 80 is likely.

> the smaller they get the worse they are. He'll lose 10W+, which is why
> I suggested an ordinary series regulator as a viable possibility. He
> can just wire the whole thing onto the heatsink and put it in a shoe
> box with his other inverter.

  Switchmode ends up cheaper.  Huge chunks of aluminium and a fan is more 
expensive than silicon.

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