Bob Bishop <[email protected]> writes: > HI, > >> On 22 Oct 2015, at 01:45, Greg Troxel <[email protected]> wrote: >> >> I have a net5501 (with 40G PATA spinning disk) that I run on 12V, from >> several AGM batteries and a float supply. I find that it draws 0.5A at >> 12-13V, which is about 6W. However, if I fed it 6V instead, it would >> draw the same 0.5A and be about 3W. > > Nope. The switching regulator isn’t very lossy so it would draw about > 1A at 6V. Try it.
Interesting; I will have to try that. IIRC (long ago, so unreliable) From reading the schematic it was a 7805, which is not switching, and I don't remember seeing anything big enough to be a buck downconverter, but I could well be wrong.
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