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Dual circuit LED flashing alternately

flash alternately control circuit. Only the four elements constitute an interesting two alternately flashing circuit. Is a flashing light-emitting diode VD1, VD2 is with the ordinary light emitting diodes. Course of their work is as follows: VD1 work needs 5V, 30mA. When power, VD1 light turn left when there are about 5V voltage is applied to the VD2 and VD3 on the series, VD3 to 6.2V voltage regulator diode, so VD3 does not work, then only the VD1 light, intermittent off when VD1 when limiting the supply voltage through R added to the VD2, VD3, and then work VD3 regulator, the current flowing through the VD2 light, VD1 flashing, VD1, VD2 turn to shine.

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Dual circuit LED flashing alternately