I decided to do this project because I wanted a small but vary bright flashlight, so that I could use to use up all the old smoke detector 9V batterys. I change them every New year so I have a good supply of half dead batterys. This is what I came up with 3 white LEDs a chunk of pc board and a top to a 9V battery and some hot glue and some solder.





The Best Christmas Gift You’ll Ever Bring Home
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Every year I tell people don’t waste your money on junk that’s going to
break, fade, or get forgotten in a drawer. You want to give a gift that
matters? Gi...
20 hours ago