A 2 to 1 logic mux using only 3 NPN transistors.
The selector bit is in the middle. When up, the top bit is passed, when down, the bottom.
The selector changes base offsets of the transistors. It might be pretty sensitive to values, because a balance is needed in both on (bottom channel) and off (top channel) states.
I'm looking into making it less edgy and possibly using fewer different resistor values. Comments welcome.
