ORIGINAL: ahicks
Not familiar with the DaiPhan, but here's how I would do it. I'd use an A123 with 2 voltage taps powering the receiver bus through 2 switches. I would power the ignition BEC with a Y placed on the throttle servo (as it's likely using the least amount of power, leaving the most available anywhere else for the ignition). FWIW
That makes good sense to me as far as placement goes. My question about the IBEC units is a little different. I'm wondering what filtering system is used to keep ignition noise out of the RX? I know this may open up a can of worms.