When it comes to the design of breathing lights, perhaps the first thing people think of is Apple. This article refers to the address: http:// Indeed, starting with the powerbook g3 and ibook, Apple's laptops began to incorporate the design of the breathing light, as long as the user closes the notebook, the sleep indicator light on the front of the notebook will be breathing, this design When it first appeared in front of everyone, people were more admired for Apple's infinite creativity. Many people also want to make a breathing light to play the role of decoration and work status. Below, we introduce several circuits for breathing lights. Figure 1 Breathing characteristics and time parameters 1. Understand breathing characteristics and time parameters Breathing is divided into two processes: Inhalation: The exponential curve rises and the process requires 1.5S Exhale: the exponential curve drops, the process requires 1.5S For adults, the average breath is 16 to 18 times per minute. For children, average 20 breaths per minute The above parameters are the number of times in a uniform breathing situation. Can be used to make an indication of sleep. 2, breathing light circuit Figure 2 Schematic diagram of the breathing lamp circuit Component name 5mm LED highlight blue light 1 LM1458N (or HA17458) dual op amp 1 2N3904 (8050, 8550) NPN Transistor (TO92 package) 1 22uF 100V /47uF 35v / 47uF 50V capacitor 1 47K [1/4w] 4 100K [1/4w] 2 100 ohm 1 Description: Changing the capacitance or the size of R3 can change the breathing rate. After the experiment, R3 changed to two 47K resistors in series, the effect is better, the frequency of breathing is more appropriate. In addition, three 1N4007 on the input voltage string are lowered, so the effect will be better, and the breathing lamp will have a short extinguishing time. (Only suitable for green and blue LED lights, red LEDs will not have extinction time because of low luminous voltage, you can string some 1N4007 to achieve the effect) In addition, LM1458 is a dual op amp, almost all with NE5532, CA1558, etc. As for the working voltage, remove the input of 100 ohms, and directly 7.2 is no problem~ Breathing lamp circuit Figure 3 Schematic diagram of the breathing lamp circuit Another breathing light circuit Figure 4 Schematic diagram of the breathing lamp circuit
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