/diy/ - Do It Yourself

>>1661425
The positive lead of the primary and secondary are the same, which I believe is standard for any 12v ignition coil.
>>1661432
It shouldn't generate significantly more interference than the normal operation of a standard vehicle, the 20+KV reverse biased diode before the aerial indicates that this circuit is not a RF transmitter.

Here's a similar circuit, with additional information regarding matching the capacitive reactance with the inductive reactance for presumably optimal current gain.