Flashing circuits are used to warn or create advertising attention or simply to experiment, learn, and assemble an electrical circuit to see them in action. Electronic circuit flashing lights using opto (optocoupler) pc817 with durability and reliability, can combine relay or triac (Triode for alternating Current) to control bulbs with larger capacity, control 220v mains electricity. you can change the flashing frequency of the bulb according to your preference. The simple circuit does not use No Ic. There are SUBs. In the video, I have a clear detailed connection diagram for the triac role. DIY this circuit is very simple, common components. you can use old boards. you need 1 pc817 opto, 1 10kΩ resistor, 2 1k resistors, 1 100µF capacitor. Make your own flash circuit and see what happens.
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