Get ready to practice your soldering with this cute kit!
The kit contains 18 colorful LEDs, divided into three groups, arranged in a heart-shaped pattern, and driven by the transistor oscillation circuit, so that the red heart-shaped patterns continue to rotate clockwise flash, especially when used at night.
Working principle: when 3-5V power supply is used, 18 LEDs are divided into 3 groups, each time the power is turned on, the three transistors will be the first to lead, but because of the differences in components, only the A transistor turns on first.
Assuming Q1 turns on first, the LED1 is turned on. Since Q1 is turned on, the collector voltage decreases so that the voltage at the left end of capacitor C2 drops close to 0V. Since the voltage across the capacitor can not change suddenly, Q2 The base is also connected to approximately 0V, Q2 off, so connected to its collector LED2 this group goes out.
This time the high voltage of Q2 through the capacitor C3 Q3 collector voltage increases, Q3 will also be turned on quickly, LED3 this group lit, so in the period of time, Q1, Q3 collector are low, LED1 and LED3 these two groups lit, LED2 this group goes out, but as the power through the resistor R2 on the C2 Charging, Q2's base voltage is gradually increased, when more than 0.7V, Q2 from the off state into the conduction state, the collector voltage drops, LED2 this group lit, at the same time, Q2's collector voltage drop Through the C3 things Q3 base voltage is also reduced, Q3 by the turn into a deadline, The collector voltage increases, LED3 this group goes out.
Then the circuit loop in accordance with the above described process, three groups of 18 LED turns on at the same time there are two groups are lit, the LEDs are cross-arranged Into a heart-shaped pattern, a continuous flashing light cycle, to achieve the effect of the display.
- Operating voltage: 5V USB power supply
- Installation: DIY welding assembly
- Overall dimensions: Length: 78mm Width: 83mm
