I'm making a device that uses 64 small heaters on a wheel. The wheel turns and a handful of the heaters will be on at a time in a specific region. As heaters leave that region they turn off. As new ones enter that region they turn on. It occured to me that it could be useful to be able to identify individual heaters digitally. The assembly is on a slip ring. The wires running from the slip ring are used to power the heaters. It would be difficult to run additional wires from this spinning assembly so I started thinking about wireless options and it occured to me that the heater itself could be an antenna for an rfid chip. I don't necessarily need to identify heaters when they are energizes so it seemed like that might work. I modified the heater design to be more condusive to this idea, tested it out and low and behold it worked... well, sort of. I can read the number from the chip. The chip and load are in parallel so it works until you power the heater by any useful amount and then it blows the chip. I tried protecting the chip using pptc resettable fuses. That seems to help but if I suddenly apply anything above ~13Vac the chip is blown. If I ramp slowly I can go higher. I'd ideally like to safely go up to 18Vac. I'm wondering if there is a simple way to dampen the initial rush so that the pptc has time to restrict current before the RFID chip is affected. Or is there perhaps a better method altogether? Thank you for your consideration.