Hi I'm using a 12VDC battery to power an ignition coil as well as a voltage regulator that powers some IC chips. I've found that if the spark plug is corroded or the secondary is open, the voltage regulator heats up and starts to fail. I'm guessing that there is a voltage spike on the primary of the ignition coil if the secondary fails to spark and dissipate. Can someone explain to me why this is? Also, I tried tying a 12V zener diode across the primary of the ignition coil to protect the voltage regulator but it doesn't seem to help. Can I not run the ignition coil and IC circuits off of the same power source? Do I need a RC snubber or something? Are there any best practices for protecting the ignition coil and IC circuits when running them off of the same source?
Thanks for your help!
Thanks for your help!