![]() I do not wish to be mean to this idea, I love the concept.The angle-head flashlight (Fulton MX-991U) on the left uses an incandescent bulb, while the adjustable angle-head flashlight (Streamlight Sidewinder) on the right uses LEDs to give white, red, blue, and infrared lightĪ flashlight ( US, CA) or torch ( UK, AU) is a portable hand-held electric lamp. If it could power a tiny amp it could make a very quiet Xtal Radio louder with a small amp. Years ago I made the Flash Film Camera Circuits - CF lamp units, this would make a nice addition, provided you do not have to crank for 10 minutes to get 5 minutes of light. I would love it as a power source for small radio and a jewel thief lamp, emergency light/radio. So how many minutes of pumping does one need to charge the cap for how many minutes of full brilliance light? If you need to recharge every 2 minutes these have little value o/t scientific curiosity. All with Ni-Cd batts not the useless button batts in the wind up flashlights. I tried and tried with dynamo's and they never got me more then 2 minutes of power. All were complete crap The Solar cell feature worked weakly for a few minutes and the lights same. I have owned at least 3 dynamo powered lights and 2 "Survival Radios". ![]() This is not the best means of voltage regulation since it can potentially generate a lot of heat, but since the current we are working with is relatively small, it should be fine. Any component connected in parallel to the diode will receive at most 5.1V. ![]() For instance, if the motor produces 9V, then 5.1V will flow across the diode and 3.9V will fall across the resistor. If the voltage exceeds 5.1V, then the zener effect kicks in limiting the voltage across the diode to 5.1V, and dropping any additional current across the current limiting resistor. By connecting a 5.1V zener diode in series with a 100 ohm resistor in a reverse bias position between power and ground, we can ensure the voltage to the capacitor never exceeds 5.1V. While the voltage coming out of the motor is probably fairly small, to be on the safe side we can use a zener diode to ensure it never exceeds the capacitors 5.6V operating voltage. However, before we do that, we need to make sure that the voltage from the rectifiers will never exceed the voltage of the supercapacitor. Once we have a nice clean DC signal coming out of the rectifiers, we will then need to charge a supercapacitor. ![]() We are getting alternating current out of the motor, but we are trying to power a DC circuit. To test this out, add an LED to each pair of motor coils and observe what happens. Since stepper motors tend to have large magnets and multiple coils, this makes them highly efficient at generating electricity.Īll we need to do is crank to the motor shaft. The key word here is "alternating." If you consider that a motor is actually a transducer and can both be powered by electricity, and generate electricity when manually powered, a stepper motor actually has two coils producing alternating current when you turn the motor shaft. Don't worry too much if this doesn't make too much sense right now. By powering the coils one after another, and then alternating the polarity and powering them again, the motor is able to move. A stepper motor is a special type of motor that has two power coils. The secret sauce to this project is a stepper motor.
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