On 17 Jan 2010 16:01:35 GMT, mick wrote:

On Fri, 15 Jan 2010 23:02:08 -0800, John Larkin wrote:

snip

There's a pot on the linear regulator; it's in plain sight. And that's
all this thing needs. The PWM accomplishes nothing.



PWM dimming is more efficient than linear dimming - by a long way. It all
depends on how much heat the OP is willing to let the dimmer dissipate.

PWM is no more efficient than resistive dimming the way he did it.
There are no inductors in his circuit. All this sort of PWM can do is
move the heat around.

John