OK, so I accidentally volunteered to make an X-factor type buzzer board for a school event. Three switches. Throw each switch, in any order, a light comes on. Throw the third switch, in any order, and a buzzer and/or fourth light comes on. It's a simple circuit. Must be. Just a few transistors, LEDs and batteries. But, I just cannot work it out! I should be able to sketch it out in my sleep, but my brain will simply not cooperate. I'd prefer to use a single DC power supply, up to 12V (multiple LEDs to make the lights brighter), but I have several I can use if required. Dimensions are not important, I'll just change the lengths of wires. But, can you help with the circuit? >K< Thank you, Lemonie!