Thanks OF. Your research is well appreciated. I just swapped the HVD with the 2.5 "Unregulated" and I did seem to get better performance with the HVD. I hope they release 7.4 heads to replace the 2.5 heads. I see no point in them having different heads. Does this mean we got ripped off by purchasing those 2.5 heads?
First off, you're welcome, very glad you found it useful. That was, of course, my goal in posting.......
Yes, I agree, if you're careful you can sense 'hey, this is hotter'. I'm just afraid of the HVD head in terms of it going on 'by itself', if the auto reset 'feature' wasn't there (so lock out could be trusted) I'd feel differently, but it is what it is.
IMO the V2.5 is a better head, the mechanical improvement alone justifies ten bucks to me. Remember, several guys have killed their V2s screwing stuff into them, and I like to experiment and end up trying all sorts of odd stuff. If it was more than ten bucks I might feel different, but I see it as cheap insurance.
I'm looking forward to a lower loss ('unregulated') version when it becomes available, but for now it does a fair job and swapping out the 15650 for the AW 15500 makes it run hotter than the HVD does with the 16500.
The primary losses in most electronic switches is in the FET carrying the current (same for any switching supply - my stereo amp has a pair of Darlingtons that must weigh several pounds each - an old class A/B heater). Anything that reduces _losses_ (and we call them that for a good reason) will translate to more energy for the desired purpose - either faster, better or longer lasting - it HAS to be a win.
Good point, let's hear it for class C....and D for the radio geeks out there, both of them.
It's also worth noting that in the case of the improvement from battery change we're talking about moving the heat from the battery (where we don't want it) to the load (where we do), kind of a
double win. Not to mention longer battery life as well and more comfort.
We have little enough power to start with, nice to use as much as possible getting the job done......
Thanks.
OF