Imagine the situation - a young man with headphones, dancing, talking with her grandfather. Grandpa such disrespect't like it, and he yells: "Shut barrel organ!" And why not? Because the organ is an old musical the tool, powered by the muscular force of organ-grinder, twisting the handle.
As we spend the money to buy the batteries time to recharge the batteries? And if the grid is not available? Christmas holidays January 2011 showed that the end of the world can come and in Moscow. Here is the technogenic accident character and made me think about absolutely Autonomous power source for portable MP3 player, the idea is simple. Any brushed motors DC magnetic stator in essence is the generator, as if you rotate the shaft. it appears at the terminals of the voltage. Now this voltage you need to do is weakly dependent on the rotational speed, but in the same way. the extreme speed and short stops.
Figure 1 shows the scheme of such Dynamo on the basis of the motor from an old portable cassette the tape recorder.
When the rotor of the electric motor M1 generates a constant voltage. Diode bridge VD1-VD4 allows you to rotate the rotor in either direction, the ultracapacitor C1 capacity 1 f accumulates charge and serves to maintain the power of the MP3 player in short breaks "the organ grinder" or non-uniformity of rotation. When the container 1 f and the normal current consumption MP3 player pocket with off backlight display capacitance C1 is enough for the operation of the player within 1-2 minutes after stop the motor-generator.
Integrated stabilizer A1 maintains the output voltage at the level of 1.25 V, while the voltage on C1 with vigorous rotation of the rotor can reach 4…5 V. the Decision to include electric double-layer capacitor before the regulator is caused. in the process discharge inistra the voltage across it falls smoothly, and for the supply MP-3 player, you need a stable voltage. Besides charging C1 with headroom the voltage can increase the time of rotation of the rotor the motor-generator.
The basis of this "organ" is the tape drive mechanism from an old and long ago defective cassette recorder. There is a flywheel with a capstan, and an electric motor DC permanent magnet rotor. Stabilizer the speed of rotation we don't need, so it is removed, leaving only the pure the electric motor.
As a mechanical part, without hesitation, it was decided to use the details old. LSM, from which, in fact, and an electric motor. Replaced the belt fresh, and the tone is the flywheel shaft attached through a socket screw-clamp the handle also faulty manual coffee grinders. Rotating the knob, rotate the flywheel, and from him rotation is transmitted through the belt shaft of the motor. Rotation only need to start smoothly to avoid stalling, because at the initial stage is charging ioniser, which leads to an increase of the load current of the motor generator, and, due to this, the difficulty of rotation of its rotor.
Supercapacitor at a working voltage of 5 V.
The regulator circuit can be done differently, but it is necessary that the stabilizer consumed current is smaller, since it reduces the time work without any spin. So the usual parametric stabilizer like led and resistor to use is not highly desirable.
Author: V. We Can Say