Can LED light beads be replaced by ordinary flashlights?
The LED lamp and the battery voltage must be collocation appropriate, if the battery voltage is high, we must work if the current limiting resistor in series, voltage of LED is higher than the battery voltage, lamp current will be insufficient, the brightness will be dark, even too dark.In addition to ordinary small bulb screw, and the LED lamp is double lead or patch, need to be modified, many species of LED, need to select the voltage and current are suitable. There needs to be some basic knowledge of electronics.
Ordinary flashlight to see what is inside the battery flashlight, if two (3V), with about 3.4V LED beads, but the best a small series resistance, because (* NEW) ordinary disposable dry cell voltage will be higher, easy to damage the LED lamp, used for a period of time, voltage drop that is safe. If it is a flashlight with 3 batteries, it is necessary to fit a suitable resistor in order to prevent the LED from being burned out.
You need to find a diode with a pressure drop, or it will burn the diode if the light is not bright or too bright.LED luminescence principle:The terminal voltage of PN junction constitutes a certain barrier. When the forward bias voltage is applied, the potential barrier decreases, and the majority carrier in the P region and the N region diffuse to each other. Since the electron mobility is much larger than the hole mobility, a large amount of electrons will diffuse into the P region, which will result in the injection of minority carriers into the P region. These electrons are combined with holes in the valence band, and the energy is released in the form of light energy when combined. This is the principle of PN junction luminescence.
