Led light running mixed using not gate

Many people would never suspect.IC is not Gates, frequency generator that? Will be deployed there? The rubber or how it works? This circuit will work to understand more easily.Because a simple circuit is simple.
This circuit, the circuit will run at the IC not gate, the circuit arranged as a sequence.Work is in the initial condition at pin 3 of IC1 / 1 to 0 volts, will cause the voltage at pin 2 of IC1 / 1 to 9 volts.And pin 15 of IC1 / 6 to 0 volts, the LED1-LED8 not lit.However, due to pressure from the pin 2 of IC1 / 1 is connected to R3, C3 to charge through the R3.To Pin 7 of IC1 / 3 to 9 volts.As a result, the voltage at Pin 6 to 0 volts, pin 10 of IC1 / 4 is 9 volts, the LED17-LED24 light.Because pin 6 of IC1 / 3 R3 is connected to the pin 5. Of IC1 / 2 to 0 volts, as a result, the voltage at pin 4 to 9 volts.And pin 12 of IC1 / 5 is 0 volts, LED9-LED16 it off.However, subsequent pressure on the leg 4 of IC1 / 1 to make pin 3 of IC1 / 1 to 9 volts.The next, LED1-LED8 light.
The order of the signal voltage at IC1 pin is pin 15, 12 and 10, respectively, were indefinitely.

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