The nasty one with the signal continuing after the radar as gone, I fixed. I can send you the code if you want.
Maybe make a PR on github? Should be easy to fix anyway.
Didn't think to reset these signals, but yeah, probably a good idea, if only to indicate that the thing isn't working that way.
Will fix either way, thanks for reporting.
I see you use constant combinator as a start for your new entities. That doesn't use power. So no bug there.
It can be implemented anyway, by using/combining multiple entities.
E.g. https://mods.factorio.com/mod/Color_Combinator_Lamp_Posts uses power and is a constant combinator.
But with the counter being placed next to a radar anyway, there's probably no point adding any power drain there, except purely cosmetic.
Alarms can probably be re-implemented as a power pole and connect to a power grid via copper wire by themselves, but meh, seem to be more hassle and complication than it's worth - not like tiny power drain will make a difference for these, and whatever they're connected to should probably use more of it anyway.
