Introduction: Schematic

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When any button is pressed power will flow to the base of the transistor and it will behave like a closed swith and act like a short and turn off the LED

Step 1: Things You Will Need

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2x 12k ,o, resistor
1x 731 ,o, resistor
1x npn transistor
2x push buttons (or some input like arduino)
Jumper cables
9v battery and holder
Breadboard (or pcb)

Step 2:

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Make a simple led circuit. The LED represents an output

Step 3:

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Add a transistor an connect Collector to + and Emitter to ground as shown

Step 4:

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Add buttons and connect them from the + terminal to the Base of the transistor with a 12k resistor for each button.

Step 5:

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Step 6:

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And now your done if you press button A the led will turn off if you press button b it will also turn of and both also off and none on


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