Introduction to the principle of flashing lights

The circuit operation principle of the device is shown in the following figure. Plug in the power plug CT, because the normally closed contact j1 of the relay J is closed, the lamp H is lit, and since the normally open contact j2 is in the off state, the 4 pin of the LSE outputs a low level, and the triode VT is guided at this time. through. After VT is turned on, relay J is energized, contact j1 is disconnected, H is extinguished, and contact j2 is closed, so LSE's 4 pin outputs high level at this time, transistor VT is cut off, relay J is released, contact j1 It is closed again, H is lit, and the contact j2 is turned off again, so that the cycle is repeated cyclically, causing the lamp H to blink.

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Flashing light

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