Dynamic heart-shaped lamp

Dynamic heart-shaped lamp

This project uses 9013 transistors to form an oscillator circuit driver, containing 18 0603 SMD LEDs, divided into 3 groups, arranged to form a heart-shaped pattern, so that the red heart-shaped pattern continuously rotates and shines in a clockwise direction, especially when used at night Very dynamic at the time. The pure hardware circuit has strong reliability and simple circuit structure, making it suitable as a kit for novices to learn.

Schematic design instructions

    As can be seen from the schematic diagram, 18 LEDs are divided into 3 groups. When the power is turned on, 3 9013 triodes will compete to turn on first. However, due to differences in components, only one triode will turn on first. Assume Q1 here. When Q1 is turned on first, the group of LED1 lights up. Because Q1 turns on, its collector voltage drops, causing the capacitor C2 terminal to drop to the left, close to 0V. Since the voltage across the capacitor cannot change suddenly, the base of Q2 is also pulled to approximately 0V, Q2 is cut off, so the group of LED2 connected to its polar electrode goes out. At this time, the high voltage of Q2 increases the collector voltage of Q3 through capacitor C3, Q3 also turns on quickly, and the group of LED3 lights up. Therefore, during this period of time, the collectors of Q1Q3 are all low level, the two groups of LED1 and LED3 are lit, and the group of LED2 is extinguished. However, as the power supply charges C2 through resistor R2, the collector voltage of Q2 gradually increases. High, when it exceeds 0.7V, Q2 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 drop of the collector of Q2 causes the base voltage of Q3 to also decrease through the capacitor C3. Q3 changes from on to off, its collector voltage increases, and the group of LED3 goes out. Next, the circuit cycles according to the process described above. Three groups of 18 LED lights will light up in turn. At the same time, two groups of 12 LED lights will be lit. These LEDs are arranged crosswise into a heart-shaped pattern, and the cycle continues. Flashing and glowing, achieving the effect of dynamic display .

PCB design instructions

The heart-shaped arrangement is extremely precise, and the three TO-92 packaged transistors placed on the bottom layer can be used as a tripod support.

This is my first DIY automatic wiring. Now that I have learned the wiring, I don’t have time to change it. If you are interested, follow the wiring rules yourself first. Don’t follow me and do the right-angle fork. (Manual face covering in a funny manner)

Because I am still in school, I have many courses, and I am still doing other small DIYs. If you are interested, you can try to change the LED package. Personally, I feel that 0603’s neck almost broke when he first learned to solder, woo woo woo.

Software description

No software, hey hey, good news for pure hardware circuit lovers, feel the fun of welding! ! ! ! !

Physical display instructions

You can put on blue lights, oh yeah! ! !

You can DIY lanterns, yahoo! ! !

You can DIY copywriting on the back, hehe! ! !

Precautions

Meng Xin, please don’t burn your hands when soldering the patch. Don’t touch the patch with the soldering iron for too long. Investors who know how to use steel mesh will pretend that I didn’t tell you.

(Anyway, since I can’t add chicken legs to my meal, I don’t think I can afford it, woo woo woo)

Demo video

https://b23.tv/Sab3HZj