is it possible to build a cheap step down transformer that will accept a car ignition coil as the source power and privide a high amp output. I can't measure the voltage or amperage from a coil but I believe the volts to be at least 30,000 but the amps are only milliamps. Stepping down voltage must increase amps but how far can you step down the voltage and what possible amperage could be extracted from it. thanks. wasanne.