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
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Step 1: Things You Will Need
2x 12k ,o, resistor
1x 731 ,o, resistor
1x npn transistor
2x push buttons (or some input like arduino)
9v battery and holder
Breadboard (or pcb)
Make a simple led circuit. The LED represents an output
Add a transistor an connect Collector to + and Emitter to ground as shown
Add buttons and connect them from the + terminal to the Base of the transistor with a 12k resistor for each button.
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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