Silly question, does the circuit work as intended with smaller loads? On Sat, Jan 28, 2017 at 7:37 PM, IVP wrote: > > Have you tried a resistor from pin 8 to +16V instead of connecting > > it to pin 1? > > I've disconnected 8 from 1 and connected it to 16V with a 240R, which > I think should be enough base drive for the output transistor as it's qui= te > lightly loaded. The output voltage has gone up to 3.4V (from 2.5V) into > a 6R8 load, still only 0.5A > > The FET gate is being driven a bit closer to 0V, around 0.9V, down > from 1.4V, and up to 16V > > Maybe the DC resistance of the inductor is too high. It appears to be > being switched OK, but perhaps isn't storing enough ooomph > > I'll try less (fewer ?) uH with thicker wire, see if that helps > > Joe > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2016.0.7998 / Virus Database: 4749/13856 - Release Date: 01/28/1= 7 > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 Jason White --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .