LED light adjustment simulation circuit design schematic

Before you talk about 3.7vled lamp circuit, let's first understand the LED of the LED. The end voltage of the LED is constituted a certain barrier, and the barrier decreases when the bias voltage is added, and most carriers in the P-zone and N regions are diffused to the other party. Since the electronic mobility is much larger than the air pocket mobility, a large amount of electron is diffused to the P region, which constitutes the injection of a small number of carriers in the P area. The energy obtained by the hole in these electrons and the valence band is released in the form of light energy. This is the principle of PN junction. 3.7VLED light adjustment circuit map Daquan (1) High-brightness White Luminescent Diodes (LEDs) are now popular lighting sources because this light emitting device is more energy efficient than all other light sources. Here is a self-made LED dimming lamp. It does not use a dedicated IC, nor using a single-chip microcomputer, only one normal digital circuit and a small amount of discrete components can DIY a table lamp with button tone. Circuit: The brightness of the table lamp is divided into weak, medium and strong, plus "off" a total of 4 working conditions. Assume that the flashlight is in the state of "Off", then press the button in a short time, the table light will be changed in the order of "weak, medium, strong,", and below is its circuit diagram (Figure 1). The circuit is powered by a single mobile phone lithium battery, and the entire table is mounted in a small plastic casing. Since the CMOS circuit is very static electricity (5 μA or less), the power switch is not set up in addition to the buttons of the conversion operation. The key component LED in the circuit uses high-power white light emitting diode. 3.7VLED light adjustment circuit map Daquan (2) Made a small device for a 3.7V lithium battery. In order to facilitate usage, it has been called this charging circuit. It is just that some people find this circuit, send it only for reference only. . The circuit diagram is as follows, with constant current, limiting function, and simple status indication, which is often easy to produce electronic components. 3.7VLED light adjustment circuit map Daquan (3) Solar flash chip, 3.7V lithium battery application LED drive chip, lamp string chip YX8613

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