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Question:

Rechargeable LED flashlight

Rechargeable LED flashlight

Answer:

General are battery broken ~~~4 diode rectifier out because there is no pressure, so there is about 330V, if the battery for battery grips, so with the battery voltage and then the rated voltage of the battery itself almost.
Pay attention to whether the resistance power is enough, although the current is very small, but the resistance to share the voltage will be great, so power enough
The circuit cannot be used because the battery is broken and cannot match the impedance. Each LED current voltage is about 5mA, according to 3V, he is in series or parallel to decision circuit, home 220V voltage is effective value, the actual maximum resistance to 310V, as this is, can not because led itself is a diode rectifier diode, the half wave is enough 50Hz visual effect is little difference
The capacitor is usually used as polyester capacitors, reactance, and lead-acid rechargeable battery series, impedance matching, to control the voltage, is a simple and cheap charging means, you disconnect the battery directly measured will certainly produce a very high voltage.

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