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Repair led flashlight Chinese production

Repair led flashlight Chinese production It was just at the same time as it took the flashlight. While the light was, I mean the flashlight and thought, and when the light disappeared, I began to use it in full, so in the entrance not to die in complete obscurity. Once upon a time I bought a Chinese lantern and it would not fully put the batteries. When he got out and turned on, it is not long got burned and gave up the Ghost. I pulled the batteries from the radio and clock and flashlight again used, but this time it worked for about a couple of hours. Probably should tell you about the flashlight. This is a common led flashlight 9 in which diodes are connected in parallel. One end of all the LEDs together and to the battery on one side, and the second in the pile and on the housing and the switch on the other side. Overall a pretty simple device in appearance and in operation. But when I pulled out from the player AAA batteries with a capacity of 1500 mAh, and decided to use them in a flashlight, then upon the expiration of the strange circumstances, it does not work. It seemed to me that the current consumption of the battery of this capacity will be enough for a day of continuous operation, in fact it was much worse and what is most interesting five LEDs just burned. I think just burned from overheating Not at all! They burned from the fact that the scheme had no limiter current consumption. In the old design were normal batteries and they seem to have had a large internal resistance and thus as if the current was decent for LEDs and everything worked properly. When I put the batteries in, and they have their own resistance two times less, and in the circuit the current is raised and the consumption of electricity has increased and is generally part of the led went to the dump. I know exactly what LEDs are, I decided to put replace burned-out require a 3.3 to 3.5 volts at a current of 20 mA. Here and replaced all the LEDs with new ones, I have included in the circuit by selection of additional resistance. Since I have had three batteries of 1.5 volts, then I applied two 0.2 W impedance of 5 Ohms (wound himself from manganin wire). Everything turned out as expected, the current on each led was taken within the 120-mA (probably All depends on the diode). Gathered design on the stand has been running for 24 hours as expected, and only 20 with a small but bright lights and one led light is not burned. Here, in principle, not difficult debugging Chinese lantern on three batteries. In conclusion I can say that it is better to take flashlights with LEDs with two batteries instead of three, because the LEDs operate at 3.3 to 3.5 volts at a current of 20 mA, such feeding them more comfortable. In General one should not think that all this Chinese stuff, this stuff can make a pretty good flashlight, of which many dream, and which is in the shop with similar parameters is five times more expensive:))

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