Q:LED rechargeable flashlight can not charge, but plug in power can be bright, what is the reason?

It is estimated that the flashlight comes with rechargeable batteries, aging or poor battery contact

Q:Led how can I buy a high power flashlight?

A rechargeable flashlight is a hand-held electronic lighting tool that can be recharged repeatedly. Rechargeable flashlight, green environmental protection, explore the guest's PT10, PT40 rechargeable flashlight, imported raw materials.

Q:LED flashlight, what brand of good?

Common light flashlight is a kind of outdoor lighting tool which uses high-power light-emitting diode as light source. It has the advantages of electricity saving, durability and high brightness. Cap LED flashlight with two light, a condensing cup condenser, a convex lens, condensing cup condensing effect is good, the light loss is small, light weight, can put the lamp holder part of the seal is very strict, improve the waterproof effect, the spot is in want of perfection is not adjustable, so that the use of it is near the illuminated area is very small, but the biggest advantage of stepless convex lens is the spot size can be adjusted, but it is difficult to achieve good waterproof, so the general outdoor sports enthusiasts will choose the former according to the environment. Power flashlight for rechargeable lithium ion batteries or nickel cadmium battery capacity, ranging from hundreds to thousands of Ma, according to the common power source LED, endurance range in tens of minutes to several hours. In fact, I think the best bright flashlight does not necessarily like you, you do not like the best flashlight is the best, and specifically buy what kind of or according to their own preferences to set.

Q:How about the LED rechargeable flashlight bulb flashing?The components are intact and flashing

LED and damaged only replace the bad light emitting unit. The electronic market can go to buy a few and your flashlight like LED, very cheap, the only bad welding off, replaced it, the remaining few backup, because will bad. A long time you will find LED the brightness of a, this is the voltage to blame

Q:High power flashlight LED lamp is 1W, want to use mobile phone battery when 4.2V is connected to electric drums!

As for the big resistance associated with rated voltage of LED bulb. Assuming the 3.3V, the 1W current is about 0.3A.The voltage on the resistor is 4.2-3.3=0.9V, the current is 0.3A, and the series resistance is about 0.9/0.3=3 ohms.Assuming LED lamp voltage rated voltage is 3V, current of about 0.33A 1W.Resistor voltage is 4.2-3=1.2V, current 0.33A, about 1.2/0.33 = 3.64 OHM Series resistor.

Q:What's the reason for the LED flashlight on?

You put the switch apart and see there is no metal rust, flash is not caused by the battery protection board, when the voltage drops to a certain extent can play a protective role, you should not say the shift will be bright protective plate problem you have extended barrels without flashlight

Q:Heat dissipation of 3W high power LED flashlight

I now buy UltraFire C8 shell relatively large, open for a long time no temperature. Also, it says 8 hours of continuous light. I think it's almost impossible. The 1700 MAH rechargeable battery can be pretty bright for 1 hours

Q:When the LED flashlight is charged, the bulb turns dark, the light is dim, and the spot is a little yellow. It has been charged for 5 hours

Lead terminal voltage greatly exceeds the rated value, if the driver then there may be damaged. To sum up, according to the inspection process you are so simple, basically all components may be bad, such as to the exact scope of fault, to provide more data.

Q:The Q5 flashlight long-range rechargeable LED flashlight 14500 battery No. 5

If you want to be portable, you can buy a 16340 - cell flashlight, which is smaller than a AA flashlight, but is brighter than AA!

Q:Make a small flashlight with LED lights

The simplest solution: with a bright diode series together, the diode's maximum burning current and pressure drop to be found, according to the power and diode voltage drop to calculate the appropriate current limiting resistance, to ensure that the current is not big. Common battery, rechargeable battery, small lead acid battery can be used in power supply. If the supply voltage is low, the shunt scheme may be selected, but one that is broken easily leads to other overcurrent damage. The key is what you have in your hand. That's what DIY is about.