Introduction: Schematic

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

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

Step 2:

Make a simple led circuit. The LED represents an output

Step 3:

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

Step 4:

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:

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