Three-Dimensional 3D Christmas Tree LED DIY Kit Colorful LED Flash Circuit Kit Electronic Fun Suite

Product Parameters:

Name: colorful Christmas tree electronic production kit

Operating voltage: DC5V (optional cell phone charger, dry battery, etc.)

Specification: with shell loose parts and without shell loose parts (need to be self-assembly)

Working principle: when connected to the 3-5V power supply, 37 LED is divided into 4 groups, whenever the power supply is turned on, 4 transistors will compete to lead, but due to the differences in components, only one transistor is the first to lead, here assuming that Q1 is the first to lead, then the LED1 this group of light, due to the Q1 conduction, the collector voltage drops so that the left end of the capacitor C2 down, close to 0V, due to the capacitance of the two ends of the Voltage can not be changed abruptly, so the base of Q2 is also received to approximate 0V, Q2 cutoff, so connected to its collector LED2 this group is off; at this time, the high voltage of Q2 through the capacitor C3 so that the collector voltage of Q3 rises, Q3 will also be rapidly conductive, the LED3 this group of light, so in the period of time, the collector of Q1, Q3 is a low level, the LED1 and LED3 this group of light, LED2 this group of light, LED2 this group is off, LED1 and LED3 this group of light. LED2 this group is off, but with the power supply through the resistor R2 on the charging of C2, Q2 base voltage gradually rises, when more than 0.7V, Q2 from the cutoff state into a conduction state, the collector voltage drops, LED2 this group is lit, at the same time, Q2 collector voltage drops through the C3 thing Q3 base voltage is also lowered, Q3 from the conductive into the cutoff, its collector voltage Q3 from conduction to cutoff, its collector voltage rises, LED3 this group off, next, the circuit in accordance with the above description of the process cycle, three groups of 18 LEDs will take turns to light, the same time there are two groups are lit, these LEDs are cross-arrayed into a heart-shaped pattern, the continuous cycle of flashing light, to achieve the effect of the flow of the display.

Shipping list:

Christmas tree DIY loose parts X1