Stupidly simple circuit question - answered.
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?