Dimming my Ultrafire WF-501B
I got this red LED flashlight as a Christmas present. But unfortunately the intensity was way too high for what I intended to use it for. A soft red light preserves your night vision, and is ideal for use with a telescope in the dark as was my intention. But if the intensity was as high as before the modification, night vision would suffer.
I then found this YouTube video describing how the controller circuit board could be replaced by one with more functions. As recommended I therefore ordered an AMC7135*8 2800mA 4-Group 5-Mode Circuit Board with 8 AMC7135 current regulators in parallel. The image shows the the original circuit board as connected before the modification in the front in the image and the new one behind it.
The new board gave me the choice of one of 4-groups:
- 3-mode: Lo (5%) – Hi (100%) – Strobe
- 3-mode: Lo (5%) – Mid (30%) – Hi (100%)
- 2-mode: Lo (10%) – Hi (100%)
- 5-mode: Lo (5%) – Mid (30%) – Hi (100%) – Strobe – SOS
Very interesting. I bookmarked the chip.