I'm pwming the elwire driver output. Which is AC, so... both? :)
I'm using the circuit described here (http://www.oceanbeach.com/ches/travel/burning_man/artcar/el_wire_sequencer/design.html), 24 of them on 3 of my own custom boards. I have no idea what the cycle speed limit would be, but I'm pretty sure it's constrained by the Arduino's clock. (I can't use the dedicated PWM pins because there aren't enough, so I'm faking it in code.)
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I'm using the circuit described here (http://www.oceanbeach.com/ches/travel/burning_man/artcar/el_wire_sequencer/design.html), 24 of them on 3 of my own custom boards. I have no idea what the cycle speed limit would be, but I'm pretty sure it's constrained by the Arduino's clock. (I can't use the dedicated PWM pins because there aren't enough, so I'm faking it in code.)