Description

• 1, the board is 1.6m thick, wide and strong;
• 2, all lights will be given more;
• 3, the power supply interface uses USB to T-shaped interface, simple and stylish;
• 4. The power switch adopts metal self-locking switch, which is sturdy and durable;
• 5. Give 4 copper posts and corresponding screws;

When the 3-5V power supply is connected, 18 LEDs are divided into 3 groups. When the power is turned on, 3 triodes will contend for conduction. However, due to the difference in components, only one transistor is turned on first. If the LED1 is turned on, the collector voltage drops so that the left end of the capacitor C2 falls, close to 0V. Since the voltage across the capacitor cannot be abruptly changed, the base of Q2 is also connected to approximately 0V, Q2. As of cutoff, the LED2 group connected to its collector is extinguished; at this time, the high voltage of Q2 causes the voltage of the 03 collector to rise through the capacitor C3, and the Q3 will also be turned on quickly, and the LED3 group is lit, so during the period of time In the case, the collectors of Q1 and 03 are all low level, and the two groups of LED1 and LED3 are lit, and the group of LED2 is extinguished, but as the power supply charges C2 through the resistor R2, the base voltage of Q2 gradually rises. When it exceeds 0.7V, 02 changes from the off state to the on state, the collector voltage drops, and the LED2 group lights up. At the same time, the voltage at which the collector of Q2 falls is also lowered by the base voltage of C3. Q3 turns from on to off, its collector voltage rises, and LED3 turns out. Next, the circuit is cycled according to the process described above. Three groups of 18 LEDs will be turned on alternately. At the same time, two groups of lights are lit. These LEDs are arranged in a heart-shaped pattern, and the cycle is flashing. Achieve the effect of the flow display.
Feature
1, the board is 1.6m thick, thick and strong;
2, all lights will be given more;
3, the power supply interface uses USB to T-shaped interface, simple and stylish;
4. The power switch adopts metal self-locking switch, which is sturdy and durable;
5, give 4 copper posts and corresponding screws;