Have you got any % efficiency figures. The LED cct seems quite poor from their figures. They say 40 MA drain but mean 400 mA based on both energy needs and battery life.This is about 400 to 500 mW in. Power out appears to be about 100 mW for approx 20% efficiency. I may have misread the intention of some of these figures. Russell McMahon _____________________________ From: "Roman Black" > > > Hi Edson, I got 100mA to 120mA with OK efficiency > > > even with the little RF choke. > > > > I've made some tests with 1-2mH inductors, but I've found that it > > doesn't regulate very well. R1 seens to make a voltage divider with the load > > and as the load increases (turning into a lower resistance), the voltage > > drops. > > Yes, regulation is not great. But it is good > enough for some simple things, for instance > regulation is acceptable for projects that > are within a 2:1 current range, my figures: > 4.57v @ 20mA, 4.37v @ 40mA > or > 4.37v @ 40mA, 4.01v @ 80mA -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu