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Simple touch sensitive switch circuit using 555 timer & bc547 transistor
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Led and transistor as switch
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audio driving an LED circuit | All About Circuits
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2N3904 Transistor Schematic For
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How Transistors Work - A Simple Explanation
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How to use a transistor BC547 as a switch
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Electronic – Simplest LED-transistor switch LED being on in switch’s
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Simple Touch Sensitive Switch Circuit using 555 Timer & BC547 Transistor