Lightning LED Flashing KIT. Principle of Circuits The circuit is mainly composed by three multi-vibrators. Vibrator A is formed with Q6 and Q7. Here take vibrator A to discuss the vibrator's operating principle.
When the power is on, the positive voltage of C3 dropped to zero rapidly when the Q6 starts work at first. And the base potential of Q7 also dropped to zero. At this time, Q7 is cut off in reliable. C3 will be charged slowly via R7, while C4 discharges. Q7 starts work when it's charged to Q7's threshold voltage. The positive voltage of C4 dropped to zero rapidly. And the base potential of Q7 also dropped to zero. At this time, Q6 is cut off in reliable. C4 will be charged via R10 , while C3 discharges. In this cycling way, the oscillation is formed. Vibrator A is formed with Q6 and Q7, Vibrator B is Q4 and Q5 and Vibrator B is Q8 and Q9. Vibrator A used to control the operation of Vibrator B via Q1, and Vibrator C via Q2. Vibrator A charged to work and starts to oscillate when Q1 is on. And Q2 and Q3 will be on and off according to a certain cycle. The LED which connected on J2 will be on and off accordingly. On the contrary, neither the vibrator nor LED will work when the Q1 is off. The same principle has been used on how oscillator A control the oscillator C. 12vdc YOU SOLDER CALL TO HAVE US SOLDER FOR $10.00 MORE