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Light from light to light, then from darkness to light gradually change, feel like a person breathing.Widely used in digital products, computers, audio, automobile and other fields, has played a good visual decorative effect.
Power supply voltage (dc voltage): DC12V;
Main control chip: LM358;
Luminous color: bright blue light;
Number of leds: 8
Pcb size: 4.2 cmx3.2 cm
Analysis of working principles
 Step: C1 is equivalent to a short circuit at this time, and U1A output is equal to u1a's foot 3 voltage;
 Step two: this voltage is sent to U1B below, the positive feedback circuit below makes the U1B output below high level; high voltage is VCC;
 Step three: when the U1B output is VCC voltage, the voltage difference occurs at both ends of the capacitance C1, when the output of the U1B below is charged to C1 by the R8 adjustable potentiometer, R7, R6, and when charging C1, the current flows through Q1 and the LED light is on, and the charging current on C1 decreases over time and the corresponding leds darken;
 Step four: when the C1 charge is full, C1 is equivalent to the opening, when the U1A above becomes a comparator.Because the input voltage of 2 feet is greater than the input voltage of 3 feet, the output of u1a's 1 foot becomes a low voltage of 0V;
 Step five: when the 1-foot output is 0V, the following U1B output is turned into a low voltage of 0V after positive feedback from the U1B below;
 Step vi: C1 diskharge through potentiometer and U1B below
 Step seven: when the C1 voltage diskharge causes the voltage of 2 feet to be less than 0.5 vcc, the voltage of U1A above increases with the diskharge voltage of C1;
 Step eight: when the voltage of lm 358's foot 1 rises, the output of the u 1b below becomes the voltage of VCC after positive feedback from the u 1b below;
 
 Step nine: the voltage of U1B below turns into a VCC voltage, which repeats the third step and the subsequent action.