Joined
·
438 Posts
I had some old LED flashlights laying around that I no longer use and I found some $1 ones at a Harbor Freight tent sale (that's 50 cents each). http://www.harborfreight.com/led-flashlight-mini-2-piece-9-led-3-12-69065.html I've cut them in half & soldered wires to the + and - so I can power them with a wall wart. They all take 3 1.5V batteries, but the problem is finding 4.5V transformers that can handle more than one or two lights - I would like to have a little distribution center.
I have loads of 12VDC & 5VDC sources (like computer power supplies) that can handle large loads like 20A. I measured the draw of the HF flashlights at .48A at 3VDC, but (I think) it was also .13A at 5VDC. Without additional resistors, some of the flashlights flash on & off with 5V (actually about 5.2V), like they're getting too much juice and I don't want to burn them out.
I've used the LED resistor calculators for plain resistors, but these are multi-LED lights which are fine (resistor less) at 4.5VDC, but what would I need to hook them to 5VDC and 12VDC? Or, any other thoughts? Thanks!!!
I have loads of 12VDC & 5VDC sources (like computer power supplies) that can handle large loads like 20A. I measured the draw of the HF flashlights at .48A at 3VDC, but (I think) it was also .13A at 5VDC. Without additional resistors, some of the flashlights flash on & off with 5V (actually about 5.2V), like they're getting too much juice and I don't want to burn them out.
I've used the LED resistor calculators for plain resistors, but these are multi-LED lights which are fine (resistor less) at 4.5VDC, but what would I need to hook them to 5VDC and 12VDC? Or, any other thoughts? Thanks!!!