An encapsulated assembly of electric components (12) on a board (11) wherein the board and components are encapsulated in a mass of silicone rubber (17) which rubber mass is in turn encapsulated in a mass of rigid epoxy resin compound (21) which is partially supported by pillars (13) which are mounted on the board and extend outwardly to the surface of the mass of foamed silicone rubber, electrical connection to the components being provided by connector pins (15) extending through both encapsulations.
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