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Drill Holes in Rock for Jewelry
1. A basic friction magnet gives low power, especially then you want a front light. Use a rechargable battery in every case, charge it from anything you want (with an appropriate charge controller). And drive your electronics from stabilized voltage (with dc-dc boost to 5V converter).2. The Arduino cannot give large current output needed for a front light, so you must separate it: use a transistor, or other appropriate part to drive the high current LED, and not forget about current limiting.
Add the current limiting resistor! There may be the case of ideal voltage of battery and LED, but when you fully charge the battery, a LED will fully open, and slowly die from overcurrent.Add something to direct the light to front. The LED light goes almost every direction, so only few goes to front. I attach my first try, it is made from aluminium foil + double sided paper + plain paper.You may buy "led lens 20mm", it is cheap, but really adds to the cost.
Okay, now I understand. Thanks for your answer.
Hello, I have a very similar flashlight to this one, in working condition. After removing the cover, I measured the voltage, and it seemed 1-2 V~ comes from the generator/dynamo, and it is way too few for white leds to light up. Or not?
Let me ask, why didn't you used the original switch of the flaslight?
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I like the super easy construction!The fist image shows that you have tearout problems with the table saw. Is your blade sharp, and has enought teeth? More teeth needed for finer cut, especially in plywood.
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Here you can find a very good list of 18650 battery tests, including top brands, and cheap/fake ones too.250mAh seems unlikely low. I would repeat it, even with lower currents.
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Thanks, it bought up my memories from my childhood when I was making paper kites with my father.
TRIPLE YOUR SOLAR ARRAY'S OUTPUT!
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