[GreenKeys] 28 loop supply transformer

[ken Schwieker]

Something I have been wondering about for quite a while. The 
transformer on the model 28 loop supply has a extremely high 
lamination stack height verses footprint. Very unusual as I have not 
seen this extreme in many decades of electronics work. I would have 
thought there was some optimum lamination LxW size verses winding 
cross sectional size but seems footprint size was the driving 
consideration in this case. Do not know what the loop supply current 
rating is but it must be rather high. What on a 28 would this supply 
be powering other than the loop? Solenoids?

Just curious and am thinking someone on this list can fill in the blanks.

Ken S