Touch & Hold Smart Switch | Mạch Công Tắc Thông Minh Giữ 3s Để Tắt

Build your own Smart Switch Circuit! 🔌
Press once to turn ON, and hold for 3 seconds to turn OFF — simple, stable, and perfect for DIY electronics projects.
This video shows you the full process: components, wiring, and how the circuit works.

💡 Components Used:

1x BC547 Transistor

1x Capacitor

2x Resistors

1x Push Button

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Levien DIY
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