Active or passive coil type?

[Oopee]

Hi all, just wanted to make sure: does an active coil type mean that EMU is NOT directly driving the coil primary winding but some kind of external driver circuit instead (like GM HEI ignition box..). And you define passive coil type when EMU is directly connectes to coil winding?

Thanks,
Oopee

[jt-performance]

Yes that's correct.

[Oopee]

Thanks,

I also need to know what does it mean for the ignition signal shape if I choose "coils with built in amplifier". I'am using GM HEI ignition module and as we see from the picture, the output from EMU (signal K in the picture...) needs to be high to charge the coil, and go from high to low to trigger the spark. In case of a passive coil the output needs to be grounded to charge the coil and then released to trig the spark as I know. And that would go wrong in this case with this module.

So I need to know if I choose "coils with built in amplifier" does it mean that the output can be used to drive external switch transistor that grounds the coil when output is "high", and triggers a spark when the output goes "low" like in the picture.

thanks,