1.25/Vout is fine. It doesnt need to go all the way down to zero, as Im seeing more and more power supplies truly dont.
I think I may have found a very similar power supply, in production, as to what we have been discussing here. The only problem is their $250 price tag.
The tech specs are:
Features:
Single or multi-turn potentiometer
Auto ranging input voltage 85–265Vac 47–440Hz
Variable intensity of output LED
Fan cooled for optimum performance
External fuse with spare (3.0Amp)
Auto-over temperature protection
Auto-over voltage protection
Built in EMI filter
Removable heavy-duty power cord
One-year warranty
Specifications:
Input - 85–265 Vac 47–440 Hz (auto ranging)
Output - 1.2–23 Vdc @ 2.5 A continuous, 4 A peak
Weight - 1.6 lbs.
Dimensions - 6.8” x 4.7” x 2.2”
Finish - Natural Aluminum
**broken link removed**
**broken link removed**
Im betting that this is probably very close to what we have been discussing simply based on what I know of power supplies so far, and what yall have told me regarding the LM350/317 IC. Im sure they are probably using one of those for the voltage regulator. I know some of those visible parts that I can see. But I would assume that the internal parts are along the lines of what we have discussed.
My big question with that power supply is heat dissipation. Since I dont see much in the way of a heat sink, and all I really see is the fan on the back, is there a chance that they are using the aluminum box itself as a heat sink? Thats the only way I can make sense of them using such a small box with no external heat sink and only a fan, but pretty much knowing that they are in fact running some sort of voltage regulator.