Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
I've also noticed 120 mA versions. Rare as hen's teeth and cost
about 4x more than 4 30 mA versions combined. Are those even used anymore?
Mike
I see you've noticed the basic pricing strategy for transformers:
cost is proportional to mass which is proportional to VA rating. The
exceptions are for things where there's some unique aspect (makes
them more expensive) or where there's some enormous volume to drive
the price down (e.g. ignition coils).
Same thing applies to capacitors. The dollar/joule number is pretty
constant for a given type of capacitor (e.g. high rep rate pulse
discharge), and for the same reason that dollars/VA is constant for
transformers. No novel technology here, so it's cost of materials
and the labor to assemble them.