Swing bells Wobbly Windbell Fun Electronic DIY Kit Wring 95 LEDs Wind bell 5V 9V
Description
Parameters:
Power supply voltage: DC 3-5V (USB or 2/3 batteries)
Board size: 8.2*7.5cm
Features:
After the kit is powered on, the left and right wind chimes composed of LED lights will be lit in turn in turn, visually achieving the effect of the hanging wind chimes being blown by the wind and then swaying left and right. The principle of circuit design is simple and easy to understand, and it is suitable for beginners in welding or school as a starter kit for subject training. The swing speed can be adjusted by replacing the components by yourself. The larger the capacitance of C1 and C2, or the larger the resistance value of R1 and R2, the slower the swing speed.
Circuit principle:
This kit consists of Q1, Q2, etc. to form a multi-vibrator to control the alternating flashing of two sets of LED lights. 87 LEDs are rehearsed into the shape of a wind chime. The principle of the multi-vibrator is as follows. Since the parameters of the components cannot be completely consistent, Therefore, when the power is first turned on, one of Q1 and Q2 will always be turned on first. Assuming that the Q1 line is turned on, the voltage of the collector of Q1 drops to 0V, and the group A LEDs emit light at this time; since the voltage across the capacitor cannot be abruptly changed, the collector of Q1 is 0V. When the voltage passes through C1, the base point of Q2 is also reduced to 0V, and Q2 is turned off. At this time, the LEDs of group B do not emit light. As the charging voltage of C1 increases, when it rises to the conduction voltage of Q2, Q2 is turned on, and the collector voltage of Q2 When the voltage drops to 0V, the LEDs of group B emit light; similarly, the 0V voltage of the collector of Q2 passes through C2 to make the base potential of Q1 drop to 0V, and Q1 is turned off. At this time, the LEDs of group A do not emit light. Then C2 starts to repeat the above process, so that the two groups of LEDs continue to cycle and alternately emit light.