Am I wrong or will this thing run on a single AA? I know it won’t put out many amps if it works with AA, but will it light the led?
Wasn’t this one in question a bit back? Can’t remember the thread name but it might be in the flashlight modding section…
yeah gords, and that one is a weird/mislabeled driver because if I understood correctly it’s a voltage regulator. So, not so great for LED…but could be interesting for regulating an Incan light, SF A2 style.
Imho you set the forward voltage on it. For example you want 2A flowing through the led so you will open datasheet of the led and find that it has vf 3V at 2A - you have to set 3V on the output. Forward voltage also depends on temperature of the led so it will shine differently in time.
Normall current source will adjust voltage in order to get wanted current flow. In this case you rely on known voltage drop on the load at wanted current so you transform current regulation task to voltage regulation but because of the temperature the current may vary a bit. Especially at higher modes.
How much current it can draw from a single AA depends on the boost part of the circuit. I have it on order so I will do some testing on it when it arrives.
Yeah it is a CV power supply, not a CC which works best with LEDs. The best use would probably be using that to power a 7135 driver.
CV source may have better efficiency because of no need of current sense resistor… And also…don’t you like zebralights feature of variable brightness on high? It has slightly more lumens after start. I guess it is because of using voltage regulation. I don’t have a ZL though so I can’t confirm this.
Thanks DriveX. Let us know how it goes.
Here’s the discussion thread: Buck-Boost 3A Driver at FastTech
I tried this driver out and it isn’t too good. The variable pot is touchy and I couldn’t adjust the voltage.