[GreenKeys] LOOP SUPPLIES WITH CIRCUIT BOARDS

[Robert Laag]

I HAVE JUST DUG OUT OF MY JUNKBOX 4 DIFFERENTLY NUMBERED M-28 LOOK ALIKE LOOP SUPPLIES THAT HAVE CIRCUIT BOARDS UNDERNEATH WITH TRANSISTORS AN OTHER PARTS...  WONDERING WHAT THESE MIGHT HAVE BEEN FROM OR USED WITH...  THEY HAVE SMALL TRANSFORMERS LIKE THE LOW CURRENT VERSION OF THE M28 LOOP SUPPLIES...  WHAT IS DIFFERENT ABOUT THEM I DON'T KNOW BUT THEY HAVE DIFFERENT PART NUMBERS...  BOB