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Anyone got a schematic for a simple low voltage shutoff? I have a project I'll be building soon that uses 4 18650 unprotected batteries and I want a small circuit to stop the battery pack from going below 12V so they don't get damaged. The circuit it will be powering will be drawing around 3.5A...

I'm sourcing the parts for a build using a 100W LED panel and I'm wondering if this CPU heatsink will work since I have this one laying around. Cooler Master: Hyper 212 EVO If it does work it would be nice since I can mount 2 120mm fans on it easily.

I'm looking to make or buy some sort of large UV reactive surface to write/draw on with a laser. I'm not sure exactly what to search for when looking for something already made, but ideally it would be just a large thin square plastic sheet. If i can't find one making one would also be a...

I'll be receiving the 2W-2.4W version of this laser soon SF501B 445nm Blue It needs 2 16340 batteries and all I have are some ultrafires I have around that I bought off ebay or amazon at some point in time and I keep reading that they are terrible, don't put out the advertised mAh and such. I...

I ordered these off amazon for a 2W-2.4W 445nm laser I ordered http://www.amazon.ca/HDE-Protection-Safety-Glasses-Goggles/dp/B009T6RN0G I received the glasses before my laser so I looked up a visible spectrum image and the whole area around the 445nm point was black when I looked at it with the...