Mmm.. 18V MOV varistors are readily available (and cheap!) on eBay -- any problem with putting two of those in series, across the 28VAC input? (two 18V in series == 36V protection??)

Nevermind .. the ones I saw were for 18VDC, not 18VAC. Not high enough for the DC part.


Edited by mlord (06/09/2013 19:54)