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Dual LEDs alternately flasher circuit

2017-02-05 04:17  
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Dual LEDs alternately flasher circuit
It only uses four elements to constitute an interesting two-tube alternately flasher circuit. VD1 is one flashing light-emitting diode, VD2 uses ordinary light-emitting diode. The working process: VD1 work requires 5V, 30mA. When it gets power, VD1 gets conduction, and there is about 5V voltage adding the series VD2 and VD3​​, VD3 is the 6.2V zener diode, so VD3 does not work, then only the VD1 is bright; when VD1 is intermittent bright, the supply voltage is added on VD2, VD3 through R current limiting, so VD3 regulator tube works, the current flows through VD2.