Windell, I tried a common ground connection and one signal and a variety of other ground buzzer connections and nothing works. So, as you say it is working as an ac coupled signal. Power consumption does not seem to be a problem. The schematic shows that both buzzer leads do not go to ground so it is activated in the code and done in the chip, (my cowboy logic and guess).
What little I know about them, you are saying that the capacitor will act to collect voltage and smooth out the signal which might trigger the art controller? Hope I’m understanding correctly.
