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How to make automatic light on off circuit use BD140 transistor. AC DC Invater bulb circuit - YouTube
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BD140 Transistor Pinout, Equivalent, Uses, Features & Applications - Components Info | Transistors, Power, Application
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AUDIO AMPLIFIER CIRCUIT|HOW TO MAKE AMPLIFIER USING BD 140 TRANSISTOR |ONE TRANSISTOR AMPLIFIER - YouTube
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BD140 Transistor Datasheet | Quick Data Series | CN:03| PINOUT| Features| Equivalent| Applications - YouTube
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