the new blue LED operating voltage and polarity recognition is different from the traditional LED (with the circuit board gap in the opposite direction), please test and then installed.
1>. It is DIY kit. Users need to weld it.
2>.The circuit is particularly suitable for beginners to use, interesting, the effect is obvious, the production of low difficulty. Is the assembly of the implementation of skills training, such as the preferred material.
2. Component listing:
2P Male pin
The circuit is composed of three transistors composed of the cycle drive circuit. When the power is turned on, the three transistors will lead to conduction, but because there are differences in components, only one transistor first conduction.
Here, assuming that V1 is first turned on, the V1 collector voltage drops, causing the left end of capacitor C2 to drop, close to 0V. Since the voltage at both ends of the capacitor can not be changed, the base of V2 is pulled to approximately 0V and V2 is off, and the collector of V2 is high, so the light emitting diode L5-L8 connected to it is lit. At this time V2 high voltage through the capacitor C3 to V3 base voltage rise, V3 will quickly turn on, so during this time, V1, V3 of the collector are low voltage, so only L5-L8 is lit , L1-L4, L9-L12 are extinguished.
However, as the power supply through the resistor R3 on the C2 charging, V2 base voltage gradually increased, when more than 0.7V, V2 from the cut-off state into the conduction state, the collector voltage drops, L5-L8 off. At the same time, the voltage drop of the collector of V2 is reduced by the capacitance C3, the base voltage of V3 is also reduced, V3 is turned off by conduction, the collector voltage of V3 rises, and L9-L12 is lit. Next, the circuit in accordance with the process described above cycle, three groups of 12 light-emitting diodes will be rotating light, these LEDs are evenly arranged in a circular, continuous cycle of light, to achieve the effect of flow.
Changing the capacity of capacitors C1, C2, C3 can change the speed of circulation, the smaller the capacity, the faster the cycle speed. Power supply using two 5 batteries can be.
Circuit board with 1.5mm high-quality glass fiber board of the whole process, large pad, thick wire, no fly line, component layout beautiful, copper surface with tin spray treatment. Specifically for the training of the optimal design, easy to withstand repeated desalination, can improve the efficiency of use.