12 LEDs lighting loop

The transistor circuit has the three loop drive circuit. When the power is turned on, three leading pass transistor will fight, but because of differences in components, there will only be a guide through the most transistor. It is assumed that the pilot through V1, the V1 collector voltage drop, making the capacitor C2 of the left end of the fall, close to 0V. Because the voltage across the capacitor can not be mutated, so this time the base of V2 was pulled approximately 0V, V2 end, V2 collector for high voltage, it is connected to the LED above it LED5-LED8 be lit. At this point the high voltage V2 to V3 base through a capacitor C3 voltage increases, V3 will be quick to turn, so this time, V1, V3 of the collector are low voltage, only to be lit LED5-LED8 , LED1-LED4, LED9-LED12 off. But with the power supply through resistor R3 to the charging C2, V2 of the base voltage gradually increased, when more than 0.7V when, V2 by the cut-off state to the conduction state, the collector voltage drop, LED5-LED8 out. At the same time, V2 down the collector voltage through a capacitor C3 to the base voltage V3 also reduced, V3 into a cut-off by the conduction, V3 of the collector voltage increases, LED9-LED12 is illuminated. Next, the circuit loop in accordance with the process described above, 3 Group 12 will be alternately light-emitting diode, the LED is uniformly arranged in a circular, continuous cycle light, to the effect of flow. Change the capacitor C1, C2, C3 can change the capacity of circulating speed, capacity smaller, faster cycle. Power using two 5 battery .