I have two seperate sub-circuits that each have an indicator LED and only one circuit will have power at a time. So far so good, however I would much prefer to have only a single indicator light.
My Problem is that one LED comes out of a 555 IC to VCC and the other comes out of the emitter pin of a 2N2222A transitor and runs to GND.
If they both went to VCC or both went to GND it would be easy.
I tried adding a 2N2222A transistor to the 555 IC (Base to pin), collector to 9VCC and running the LED out of the emitter to GND. I also tried a few resistor values between the collector and the 9VCC.
The subcircuit still worked, but the indicator LED would not turn on.
Is there any simple way this can be done?