On battle bots flame weapons, or on home built jet engines made with turbos. What sort of circuit could be used for ignition?
The spark from a BBQ Igniter might not be hot enough to ignite gasoline, but atleast you don't need a power source .
Probably the easyest/cheapest way - get a cheap CCFL light with inverter form ebuyer (cost about 2 quid..) Im sure you can figure out how to get a nice spark from the 1.8kv output Might be a good idea if trying that to stick the inverter inside a metal box.. sometimes they explode when used or there intended purpose.. so with this To get a good spark you need a peak voltage about 1.1kv/mm of gap. Rms voltage can be quite a bit lower.. Sparks are good ignightors because they heat the air a lot - far excess of the flash point of oils.. for a very short time,