On Thursday, 9 April 2020 13:24:35 UTC+1, AJH wrote:
Any suggestions for a simple battery powered circuit which could sense
the trailing edge of the pulse to the coil circuit I and use that to cut
the current running through the coil and produce a decent spark?

Anything like this?

https://www.rmcybernetics.com/scienc...on-coil-driver

But I'd be the first to admit I have no idea what you're talking about...

Owain